No.

D-※S-OMJ0004-G

PRODUCT NAME

Solid State Auto Switch

MODEL / Series / Product Number

D-M9##
D-M9#W#
D-M9#E#
Table of Contents

Safety Instructions 2
Model Indication and How to Order 9
Summary of Product parts 10
Definition and terminology 11
Mounting and Installation 12
Installation 12
Maintenance 14
Troubleshooting 15
Specifications 23
Dimensions 25

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No.D-※S-OMJ0004-G
 Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of "Caution", "Warning" or "Danger".
They are all important notes for safety and must be followed in addition to International Standards
(ISO/IEC)*1), and other safety regulations.
*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.
ISO 4413: Hydraulic fluid power -- General rules relating to systems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines .(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.

Caution indicates a hazard with a low level of risk which, if not avoided, could
Caution result in minor or moderate injury.
Warning indicates a hazard with a medium level of risk which, if not avoided,
Warning could result in death or serious injury.
Danger indicates a hazard with a high level of risk which, if not avoided, will
Danger result in death or serious injury.

Warning
1. The compatibility of the product is the responsibility of the person who designs the
equipment or decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with
specific equipment must be decided by the person who designs the equipment or decides its
specifications based on necessary analysis and test results.
The expected performance and safety assurance of the equipment will be the responsibility of the
person who has determined its compatibility with the product.
This person should also continuously review all specifications of the product referring to its latest catalog
information, with a view to giving due consideration to any possibility of equipment failure when
configuring the equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly.
The assembly, operation and maintenance of machines or equipment including our products must be
performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is
confirmed.
1. The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent falling or runaway of the driven objects have been confirmed.
2. When the product is to be removed, confirm that the safety measures as mentioned above are
implemented and the power from any appropriate source is cut, and read and understand the specific
product precautions of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the
product is to be used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place
exposed to direct sunlight.
2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special
safety analysis.
4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using
a mechanical protective function, and periodical checks to confirm proper operation.

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No.D-※S-OMJ0004-G
 Safety Instructions
Caution
1.The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.

Limited warranty and Disclaimer/Compliance Requirements

The product used is subject to the following "Limited warranty and Disclaimer" and "Compliance
Requirements".
Read and accept them before using the product.

Limited warranty and Disclaimer

1. The warranty period of the product is 1 year in service or 1.5 years after the product is
delivered,whichever is first.∗2)
Also, the product may have specified durability, running distance or replacement parts.
Please consult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our
responsibility, a replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other
damage incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and
disclaimers noted in the specified catalog for the particular products.
∗2) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the
vacuum pad or failure due to the deterioration of rubber material are not covered by the
limited warranty.

Compliance Requirements
1. The use of SMC products with production equipment for the manufacture of weapons of
mass destruction (WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by
the relevant security laws and regulation of the countries involved in the transaction. Prior
to the shipment of a SMC product to another country, assure that all local rules governing
that export are known and followed.

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No.D-※S-OMJ0004-G
Operator
♦This operation manual is intended for those who have knowledge of machinery using pneumatic
equipment, and have sufficient knowledge of assembly, operation and maintenance of such
equipment. Only those persons are allowed to perform assembly, operation and maintenance.
♦Read and understand this operation manual carefully before assembling, operating or providing
maintenance to the product.

■Safety Instructions
Warning
•Do not disassemble, modify (including changing the printed circuit board) or repair.
An injury or failure can result.
•Do not operate the product outside of the specifications.
Do not use for flammable or harmful fluids.
Fire, malfunction, or damage to the product can result.
Verify the specifications before use.

•Do not operate in an atmosphere containing flammable or explosive gases.

Fire or an explosion can result.
This product is not designed to be explosion proof.
•If using the product in an interlocking circuit:
•Provide a double interlocking system, for example a mechanical system.
•Check the product regularly for proper operation.
Otherwise malfunction can result, causing an accident.

•The following instructions must be followed during maintenance:

•Turn off the power supply.
•Stop the air supply, exhaust the residual pressure and verify that the air is released before performing
maintenance.
Otherwise an injury can result.

Caution
•Do not touch terminals and printed circuit board inside the product.
Otherwise it can cause electric shock, malfunction or damage to the product can result.
•After maintenance is complete, perform appropriate functional inspections.
Stop operation if the equipment does not function properly.
Safety cannot be assured in the case of unexpected malfunction.

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No.D-※S-OMJ0004-G
Cylinders or actuators include cylinders, air grippers, rotary actuators, and electrical actuators/cylinders.

Design/Selection
1. Confirm the specifications.
If the product is used with excess load applied or beyond the specification range, this may cause the product to break
or malfunction. We do not guarantee against any damage if the product is used outside of the specification range.
2. Pay attention to the length of time that a switch is ON at an intermediate stroke position.
When an auto switch is placed at an intermediate position of the stroke and a load is driven at the time the piston
passes, the auto switch will operate, but the operating time will be short if the speed is too fast. As a result, the load
may not operate completely. The maximum detectable piston speed is:
Auto switch operating range [mm]
V[mm/s] = ×1000
Time load applied [ms]
3. Take precautions when multiple cylinders/ actuators are used close together.
When multiple auto switch cylinders/actuators are used in close proximity, magnetic field interference may cause the
auto switches to malfunction. Maintain a minimum cylinder separation of 40 mm. (When the allowable interval is
specified for each cylinder series, use the indicated value.)
The auto switches may malfunction due to the interference from the magnetic fields.
Use of a magnetic screen plate (MU-S025) or commercially available magnetic screen tape can reduce the interference
of magnetic force.
4. Ensure sufficient clearance for maintenance activities.
When designing an application, be certain to allow sufficient clearance for maintenance.
5. Do not mount the cylinder or actuator with the auto switch on a footing.
If work personnel gets on or puts the work personnel’s foot on the footing accidentally, an excessive load is applied to
the cylinder or actuator, causing the cylinder or actuator to break.
6. Design the circuit so that any back-flow current does not flow in if a short-circuit trouble occurs or forced
operation is performed to check the operation.
If a back-flow current occurs, this may cause the switch to malfunction or break.
7. When multiple auto switches are required.
“n” indicates the number of auto switches which can be physically mounted on the cylinders/actuators. Detection
intervals depends on the auto switch mounting structure and set position, therefore some required interval and set
positions may not be available.
8. Limitations on detectable position
There are positions or surfaces (bottom surface of the foot bracket, etc.) where the auto switch cannot be mounted due
to the physical interference depending on the cylinder or actuator mounting status or mounting bracket. Select an
appropriate auto switch setting position where the auto switch does not interfere with the cylinder or actuator mounting
bracket (trunnion or reinforcing ring) after checking it sufficiently.
9. Keep wiring as short as possible.
Be sure to use a wire length of 100 m or less.
When the wire length is long, we recommend the ferrite core is attached to the both ends of the cable to prevent excess
noise. A contact protection box is not necessary for solid state switches due to the nature of this product construction.
10. Do not use a load that generates surge voltage.
If driving a load such as a relay that generates a surge voltage, use a built-in surge absorbing element type device.
11. Pay attention to the internal voltage drop of the auto switch.
Generally, the internal voltage drop of the solid state auto switch is larger than that of the reed auto switch. When the
auto switches (“n” pcs.) are connected in series, the voltage drop is multiplied by “n”. In this case, the auto switches
operate correctly, but the loads may not operate. Additionally, note that the 12 VDC relay does not apply to the auto
switch.

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No.D-※S-OMJ0004-G
12. Pay attention to leakage current.
<2-wire type>
Current (leakage current) flows to the load to operate the internal circuit when in the OFF state.
Operating current of load (OFF condition) > Leakage current
If the criteria given in the above formula are not met, it will not reset correctly (stays ON).
Use a 3-wire auto switch if this specification will not be satisfied.
Moreover, leakage current flow to the load will be “n” times larger when “n” auto switches are connected in parallel.
13. Output operation of the solid state auto switch is not stable for 50 [ms] after powered ON.
In the output operation immediately after powered ON or AND connection operation, the input device (PLC or relay,
etc.) may judge the ON position as OFF output or the OFF position as ON output.
So, please make the setting on the equipment so that the input judgement signal is set disabled for 50 [ms] immediately
after powered ON or AND connection.
When using SMC’s AHC system (Auto Hand Changing System) Series MA, please also make this setting.

Mounting/Adjustment
1. Do not drop or bump.
Do not drop, bump, or apply an excessive impact (300 m/s2 or more for reed auto switches, 1000 m/s2 or more for solid
state auto switches) while handing the auto switch. It may cause the auto switch to break or malfunction.
2. Observe the proper tightening torque for mounting an auto switch.
When an auto switch is tightened beyond the range of tightening torque, auto switch mounting screws, auto switch
mounting brackets or auto switch may be damaged.
On the other hand, tightening below the range of tightening torque may allow the auto switch to slip out of position.
3. Do not carry a cylinder by the auto switch lead wires.
This may cause disconnection of the lead wire or the internal element to break.
4. Do not use screws other than the set screws installed on the auto switch body to secure the auto switch.
If using other screws, auto switch may be damaged.
5. Mount an auto switch at the center of the operating range.
In the case of 2-color display auto switch, mount it at the center of the green LED illuminating range.
Adjust the mounting position of the auto switch so that the piston stops at the center of the operating range.
(The mounting position shown in the catalog indicates the optimum position at stroke end.)
If mounted at the end of the operating range (around the borderline of ON and OFF), operation will be unstable
depending on the operating environment. Also there are some cylinders or actuators with individual setting methods for
auto switches. If so, mount it in accordance with the indicated method.

Even if 2-color indication solid state auto switches are fixed at a proper operating range (the green light lights up),
the operation may become unstable depending on the installation environment or magnetic field disturbance.
(Magnetic body, external magnetic field, proximal installation of cylinders with built-in magnet and actuators,
temperature change, other factors for magnetic force fluctuation during operation, etc.)

6. Check the actual actuation status and adjust the auto switch mounting position.
According to the installation environment, the cylinder or actuator may not operate even at its proper mounting position.
Even when setting at a midpoint of the stroke, check the actuation status and make the adjustment in the same
manner.

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No.D-※S-OMJ0004-G
 Wiring
1. Confirm proper insulation of wiring.
If there is any improper insulation (mixed contact with other circuit, grounding fault, or improper insulation between
terminals, etc.) in the wiring, an over-current flows in, causing the auto switch to break.
2. Wire separately from power lines or high voltage lines, avoiding parallel wiring or wiring in the same conduit
with these lines.
If an inrush current is generated, the noise may cause the auto switch to malfunction.
3. Avoid repeatedly bending or stretching lead wires.
Broken lead wires will result from repeatedly applying bending stress or stretching force to the lead wires.
Stress and tensile force applied to the connection between the lead wire and auto switch increases the possibility of
disconnection.
Keep the lead wire from moving especially in the area where it connects with the auto switch.

4. Be certain to connect the load before power is applied.

<2-wire type>
If the power is turned ON when an auto switch is not connected to a load, the auto switch will be instantly damaged
because of excess current (short circuit).
It is the same as when the 2-wire brown lead wire (+, output) is directly connected to the (+) power supply terminal.
5. Carry out the wiring work after shutting down the power.
If the wiring work is performed with the power turned ON, this may cause electric shock, malfunction, or damage to the
auto switch.
6. Do not allow short-circuit of loads.
Otherwise, the protection circuit will be activated and the indicator light will flash.
At the same time, the auto switch will be damaged.
7. Avoid incorrect wiring.
1) If connections are reversed on a 2-wire type auto switch, the auto switch will not be damaged if protected by a
protection circuit, but the auto switch will always stay in an ON state.
However, it is still necessary to avoid reversed connections, since the auto switch could be damaged by a load short
circuit in this condition.
2) If connections are reversed (power supply line + and power supply line –) on a 3-wire type auto switch, the auto
switch will be protected by a protection circuit. However, if the power supply line (+) is connected to the blue wire and
the power supply line (–) is connected to the black wire, the auto switch will be damaged.

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No.D-※S-OMJ0004-G
 Operating Environment
1. Never use in an atmosphere of explosive gases.
The structure of auto switches is not intended to prevent explosion. This may lead to explosion hazard.
Contact SMC for information regarding explosion proof compliant product.
2. Do not use in an area where a magnetic field is generated.
Auto switches will malfunction or magnets inside cylinders/ actuators will become demagnetized. (Please consult with
SMC if a magnetic field resistant auto switch can be used.)
3. Do not use in an environment where the auto switch will be continually exposed to water.
Although auto switches satisfy the IEC standard IP67specificaitons, do not use in applications continually exposed to
water splashing or spray. This may cause improper insulation or malfunction.
4. Do not use in an environment with oil or chemicals.
If auto switches are used in an environment containing coolant, cleaning solvent, various oils, or chemicals even for a
short period of time, this may adversely affect the auto switches, resulting in improper insulation, malfunction due to
swelling of the potting resin, or hardening of the lead wires.
5. Do not use in an environment with temperature cycles.
If temperature cycles other than normal temperature changes are applied, this may adversely affect the insides of the
auto switches.
6. Avoid accumulation of iron waste or close contact with magnetic substances.
If many iron particles, such as cutting chips or spatters accumulate around a cylinder with the auto switches or an
actuator or if a magnetic substance (attracted by a magnet) is put close to a cylinder with the auto switch or an actuator,
the magnetic force inside the cylinder or actuator loses, causing the auto switch to malfunction.
7. Do not use in an area where surges are generated.
If there is an equipment unit (electromagnetic lifter, high-frequency induction furnace, motor, or radio, etc.) that
generates large surges or electromagnetic waves around cylinders with solid state auto switches or actuators, this may
cause the circuit element inside the auto switch to break.
8. Please contact SMC concerning water resistance, elasticity of lead wires, usage at welding sites, etc.
9. Do not use in direct sunlight.
10. Do not mount the product in locations where it is exposed to radiant heat.
11. Take appropriate measures against the lightning surge on the equipment side as the auto switches do not
have any lightning surge resistance specified in the CE/UKCA marking.
12. Do not use in environments subject to radiation stress.
It is not designed to withstand radiation, which may cause damage to the internal circuit elements of the auto switch.

Maintenance
1. Perform the following maintenance periodically in order to prevent possible danger due to unexpected auto
switch malfunction.
1) Secure and tighten auto switch mounting screws.
If screws become loose or the mounting position is dislocated, retighten them after readjusting the mounting
position.
2) Confirm that there is no damage to lead wires.
To prevent faulty insulation, replace auto switches or repair lead wires, etc., if damage is discovered.
3) Confirm the detection setting position.
• Red light of 1-color display auto switch
Confirm that the set position stops at the center of the operating range (red display area).
• Confirm the green light and position of the 2-color display auto switch.
Confirm that the set position stops at the center of the appropriate operating range (green display area).
If the auto switch shows a red LED while in the ON/OFF position, the mounting position is not correct. Re-adjust the
auto switch to the optimum position at the center of the operating range.
Some cylinders or actuators indicate the individual setting procedures for the auto switch. If so, set the mounting
position using the individual setting procedures.
2. Do not use solvents such as benzene, thinner etc. to clean the product.
They could damage the surface of the body and erase the markings on the body. For heavy stains, use a cloth lightly
dampened with diluted neutral detergent, then wipe up any residue with a dry cloth.

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No.D-※S-OMJ0004-G
Model Indication and How to Order

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No.D-※S-OMJ0004-G
 Summary of Product parts
•Summary of Product parts
•D-M9B(W/E)/D-M9N(W/E)/D-M9P(W/E)

•D-M9B(W/E)V/D-M9N(W/E)V/D-M9P(W/E)V

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No.D-※S-OMJ0004-G
■Definition and terminology
Term Meaning and definition
2 A type of indicating methods
which lights up the Red LED light
up when the Auto switch comes
2-color indication to the operating position, and
lights up the Green LED when
the Auto switch comes to the
optimum operating position.
2-wire Auto switch Auto switch which has only signal line and COM line.
C Current leakage The current flowing to the load when the Auto switch turns off.
H
The difference between the
points when the Auto switch
Hysteresis turns on and off, which is
provided to prevent
chattering.

I The voltage applied between the COM and signal line when the Auto switch turns
Internal voltage drop
on.
L Load current The current flowing to the load when the Auto switch turns on.
M The center position of the sensor unit (which gets the strongest reaction of the
Most sensitive position
sensor unit), which means the center position of an operating range as well.
N

Auto switch which sinks

current from the signal
NPN output
line when turning on.

∗: This circuit diagram is a

sample.

Normally open
When magnetic force is detected, the output signal turns ON.
(normal direction) output
Normally closed
When magnetic force is not detected, the output signal turns ON.
(inverted) output
P

Auto switch which

sources current from the
PNP output signal line when turning
on.

∗: This circuit diagram is a

sample.

R Reed Auto switch Auto switch which generates on and off outputs with a mechanical contact.
S The device to perform sequence control, which performs controlling such as receipt
Sequence controller
of inputs from the Auto switch along with programming and sending of the output to
(PLC)
other machines.
Auto switch which generates on and off outputs with or without mechanical contact
Solid state Auto switch
such as a transistor.

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No.D-※S-OMJ0004-G
 Mounting and Installation
■Installation
When mounting the Auto switch to the actuator, the appropriate mounting bracket should be used.
"How to mount" depends on the actuator type and bore size.
Please refer to the actuator catalogue.
For new Auto switch applications, confirm that the actuator includes a magnet before assembling the Auto
switch and bracket.

•Tightening torque
Use a watchmaker driver whose grip diameter is 5 to 6 mm when tightening the mounting screw.
M2.5 mount screw tightening torque shall be 0.05 to 0.15 N•m (0.5 to 1.5 kgf•cm)

•Setting the detection position

Position the actuator at the end of the stroke.
Set the Auto switch in the position where the Auto switch Green light is ON.

(Detecting actuator end)

Based on A and B dimensions in the actuator catalogue, set the Auto switch position.
During installation, perform adjustment while checking the operating conditions of the Auto switch.
Air grippers and rotary actuators have their own setting method.
Follow the instructions in the relevant manual.

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No.D-※S-OMJ0004-G
•Internal circuit
D-M9N(W/E)(V) (When switch power supply and load power supply
are separated.)

D-M9P(W/E)(V)

D-M9B(W/E)(V)

∗: The number marked on each lead wire color shows the pin number of pre-wired connector.

•Connection with PLC (sequence controller)

M8 3-pin connector M8 4-pin connector M12 4-pin connector

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No.D-※S-OMJ0004-G
 Maintenance
After the power has been disconnected, please observe the following precautions:-
Regarding the actuator operation set up, the contents of the program may be maintained by the customer's
application system.
Take care to confirm safety when the power is re-connected, and the actuator operation is resumed, because
the operation may have stopped in an unstable condition.

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No.D-※S-OMJ0004-G
 Troubleshooting
When the Auto switch falls in operation failure, identify the trouble with the following flow chart.
A failure of the Auto switch might depend on operating environment (application etc.) and needs to be given a
measure by contacting to us separately.
Contact type: Normally open (normal direction) output

The switch
Is the actuator
doesn’t detect Misapplication
applicable?
normally.

The switch The operation

output doesn’t LED doesn’t go Trouble No.1
turn off. off.
Yes
The operation
No LED doesn’t turn Trouble No.2
on.

Trouble No.3

The switch The operation

output doesn’t LED doesn’t go Product failure
turn on. off.

The operation
LED doesn’t turn Trouble No.4
on.

Trouble No.5

The switch The operation

outputs LED doesn’t go Product failure
normally. off.

The operation
LED doesn’t turn Product failure
on.

Normal
Trouble No.6
operation

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No.D-※S-OMJ0004-G
•Trouble list
Trouble Investigation to find possible
Trouble Possible cause Countermeasure
No. cause
Malfunction due
The effect of magnetic field Place a magnetic shield plate to
to disturbance
The switch generated by adjacent actuator the actuator.
magnetic field
output doesn’t
1 turn off. The Improper setting The presence of the following
operation LED Displace the Auto switch set
(mounting) conditions
doesn’t go off. position from the center of the
position Switch operating range
actuator operating range.
*Narrow angle >Actuator operating stroke

The switch
output doesn’t
2 turn off. The Product failure Replace the product.
operation LED
doesn’t turn on.

Satisfaction of the following

relations by the load current
specification
Load voltage is "ON" level
Mismatch the Select 3-wire Auto switch or reed
The switch > (Current leakage x n)
load current Auto switch.
output doesn’t x load resistance
specification
turn off. The or
3 (2-wire) Reduce the number of switches.
operation LED Load current is "OFF" level
operates > (Current leakage x n)
properly. n: The number of parallel
connecting switches

Correct wiring.
Incorrect wiring Reverse connection of wiring
(Refer to "Internal circuit" on
(3-wire) (black and blue)
page 13.)

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No.D-※S-OMJ0004-G
Trouble Investigation to find possible
Trouble Possible cause Countermeasure
No. cause

Adjust power supply voltage to a

given value.
Power supply Power supply voltage (zero or
(Refer to "Power supply voltage
failure extremely low)
or Load voltage" in Specifications
on page 23.)

Voltage (load) applied to the Auto

switch Correct wiring.
Incorrect wiring (Refer to "Internal circuit" on
Reverse connection of wiring page 13.)
(black and blue)

Improper setting Move the Auto switch to proper

Detection close to the limit of
(mounting) position (near the center of the
operating range
position switch operating angle).

Fix to proper position at

Displacement Looseness of the switch unit or
appropriate torque. (Tightening
from set position switch mounting screw
torque: 0.05 to 0.15 N•m)
The switch
output doesn’t Displacement of
Deviation of the actuator
4 turn on. The the actuator Stabilize stop position.
stopping angle (position)
operation LED stopping angle
doesn’t turn on.
The presence of magnetic filed
Place a magnetic shield plate
source near the actuator (electric
between magnetic filed source
welding machine conductor and
and the actuator.
strong magnet, etc.)
Lowering of
magnetic force The effect of magnetic field Separate the actuator (by 40 mm
for detection generated by adjacent actuator or more). Place a magnetic
(demagnetization) (placed within 20 mm) shield plate.

The presence of deposit of

magnetic material (cutting chip) Remove the magnetic deposit.
on the actuator

The presence of repeated

bending stress to a part of lead Correct wiring.
Breakage of
wire (Adjust tensile force and enlarge
lead wire
(bending radius, tensile force to bending radius.)
the lead wire)

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No.D-※S-OMJ0004-G
Trouble Investigation to find possible
Trouble Possible cause Countermeasure
No. cause
Satisfaction of the following
relations by the load current
Mismatch the specification Select 3-wire Auto switch or reed
load current Load voltage is "ON" level Auto switch.
specification > Load voltage - (Internal
(2-wire) voltage drop x n) Reduce the number of switches.
The switch
n: The number of series
output doesn’t
connecting switches
turn on. The
5
operation LED Incorrect wiring Condition of connected part
Correct wiring. (Perform wiring of
operates (output line) (connector contact pin and
connected part again.)
properly. (3-wire) crimping terminal)

The presence of repeated

Breakage of bending stress to a part of lead Correct wiring.
lead wire (black) wire (Adjust tensile force and enlarge
(3-wire) (bending radius, tensile force to bending radius.)
the lead wire)

Improper setting Move the switch to proper

Detection close to the limit of
(mounting) position (near the center of the
switch operating angle
position switch operating angle).

Fix to proper position at

Displacement Looseness of the switch unit or
appropriate torque. (Tightening
from set position switch mounting screw
torque: 0.05 to 0.15 N•m)

Condition of connected part

Correct wiring. (Perform wiring of
(connector contact pin and
connected part again.)
crimping terminal)
Incorrect wiring
The operation is Correct wiring.
Check if the load has a short
unstable. (Refer to "Internal circuit" on
circuit (not connected).
(chattering) page 13.)

The presence of repeated

bending stress to a part of lead Correct wiring.
Breakage of
wire (Adjust tensile force and enlarge
lead wire
6 (bending radius, tensile force to bending radius.)
the lead wire)
The presence of magnetic field Place a magnetic shield plate
Malfunction due source near the actuator between magnetic field source
to disturbance (cylinder, electric welding and the actuator, or separate
magnetic field machine conductor, motor, magnetic field source from the
magnet etc.) actuator.

The switch Malfunction due

The effect of magnetic field Place a magnetic shield plate to
operates at to disturbance
generated by adjacent actuator the actuator.
multiple points. magnetic field
Satisfaction of the following
Operating angle relations by the actuator rotation
range speed Decrease the actuating driving
The load doesn’t
Detection at Load operating time [s] speed until specified relations
work.
intermediate < Auto switch operating range can be satisfied.
position [mm] / Actuation operating
speed [mm/s]
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No.D-※S-OMJ0004-G
Contact type: Normally closed (inverted) output

The switch
Is the actuator
doesn’t detect Misapplication
applicable?
normally.

The switch The operation

output doesn’t LED doesn’t go Trouble No.1
turn on. on.
Yes
The operation
No LED doesn’t turn Trouble No.2
off.

Trouble No.3

The switch The operation

output doesn’t LED doesn’t go Product failure
turn off. on.

The operation
LED doesn’t turn Trouble No.4
off.

Trouble No.5

The switch The operation

outputs LED doesn’t go Product failure
normally. off.

The operation
LED doesn’t turn Product failure
on.

Normal
Trouble No.6
operation

-19-

No.D-※S-OMJ0004-G
•Trouble list
Trouble Investigation to find possible
Trouble Possible cause Countermeasure
No. cause
Malfunction due
The effect of magnetic field Place a magnetic shield plate to
to disturbance
The switch generated by adjacent actuator the actuator.
magnetic field
output doesn’t
1 turn on. The Improper setting The presence of the following
operation LED Displace the Auto switch set
(mounting) conditions
doesn’t go on. position from the center of the
position Switch operating range
actuator operating range.
*Narrow angle >Actuator operating stroke

The switch
output doesn’t
2 turn on. The Product failure Replace the product.
operation LED
doesn’t turn off.

Satisfaction of the following

relations by the load current
specification
Load voltage is "ON" level
Mismatch the Select 3-wire Auto switch or reed
The switch > (Current leakage x n)
load current Auto switch.
output doesn’t x load resistance
specification
turn on. The or
3 (2-wire) Reduce the number of switches.
operation LED Load current is "OFF" level
operates > (Current leakage x n)
properly. n: The number of parallel
connecting switches

Correct wiring.
Incorrect wiring Reverse connection of wiring
(Refer to "Internal circuit" on
(3-wire) (black and blue)
page 13.)

-20-

No.D-※S-OMJ0004-G
Trouble Investigation to find possible
Trouble Possible cause Countermeasure
No. cause

Adjust power supply voltage to a

given value.
Power supply Power supply voltage (zero or
(Refer to "Power supply voltage
failure extremely low)
or Load voltage" in Specifications
on page 23.)

Voltage (load) applied to the Auto

switch Correct wiring.
Incorrect wiring (Refer to "Internal circuit" on
Reverse connection of wiring page 13.)
(black and blue)

Improper setting Move the Auto switch to proper

Detection close to the limit of
(mounting) position (near the center of the
operating range
position switch operating angle).

Fix to proper position at

Displacement Looseness of the switch unit or
appropriate torque. (Tightening
from set position switch mounting screw
torque: 0.05 to 0.15 N•m)
The switch
output doesn’t Displacement of
Deviation of the actuator
4 turn off. The the actuator Stabilize stop position.
stopping angle (position)
operation LED stopping angle
doesn’t turn off.
The presence of magnetic filed
Place a magnetic shield plate
source near the actuator (electric
between magnetic filed source
welding machine conductor and
and the actuator.
strong magnet, etc.)
Lowering of
magnetic force The effect of magnetic field Separate the actuator (by 40 mm
for detection generated by adjacent actuator or more). Place a magnetic
(demagnetization) (placed within 20 mm) shield plate.

The presence of deposit of

magnetic material (cutting chip) Remove the magnetic deposit.
on the actuator

The presence of repeated

bending stress to a part of lead Correct wiring.
Breakage of
wire (Adjust tensile force and enlarge
lead wire
(bending radius, tensile force to bending radius.)
the lead wire)

-21-

No.D-※S-OMJ0004-G
Trouble Investigation to find possible
Trouble Possible cause Countermeasure
No. cause
Satisfaction of the following
relations by the load current
Mismatch the specification Select 3-wire Auto switch or reed
load current Load voltage is "ON" level Auto switch.
specification > Load voltage - (Internal
(2-wire) voltage drop x n) Reduce the number of switches.
The switch
n: The number of series
output doesn’t
connecting switches
turn off. The
5
operation LED Incorrect wiring Condition of connected part
Correct wiring. (Perform wiring of
operates (output line) (connector contact pin and
connected part again.)
properly. (3-wire) crimping terminal)

The presence of repeated

Breakage of bending stress to a part of lead Correct wiring.
lead wire (black) wire (Adjust tensile force and enlarge
(3-wire) (bending radius, tensile force to bending radius.)
the lead wire)

Improper setting Move the switch to proper

Detection close to the limit of
(mounting) position (near the center of the
switch operating angle
position switch operating angle).

Fix to proper position at

Displacement Looseness of the switch unit or
appropriate torque. (Tightening
from set position switch mounting screw
torque: 0.05 to 0.15 N•m)

Condition of connected part

Correct wiring. (Perform wiring of
(connector contact pin and
connected part again.)
crimping terminal)
Incorrect wiring
The operation is Correct wiring.
Check if the load has a short
unstable. (Refer to "Internal circuit" on
circuit (not connected).
(chattering) page 14.)

The presence of repeated

bending stress to a part of lead Correct wiring.
Breakage of
wire (Adjust tensile force and enlarge
lead wire
6 (bending radius, tensile force to bending radius.)
the lead wire)
The presence of magnetic field Place a magnetic shield plate
Malfunction due source near the actuator between magnetic field source
to disturbance (cylinder, electric welding and the actuator, or separate
magnetic field machine conductor, motor, magnetic field source from the
magnet etc.) actuator.

The switch Malfunction due

The effect of magnetic field Place a magnetic shield plate to
operates at to disturbance
generated by adjacent actuator the actuator.
multiple points. magnetic field
Satisfaction of the following
Operating angle relations by the actuator rotation
range speed Decrease the actuating driving
The load doesn’t
Detection at Load operating time [s] speed until specified relations
work.
intermediate < Auto switch operating range can be satisfied.
position [mm] / Actuation operating
speed [mm/s]
-22-

No.D-※S-OMJ0004-G
 Specifications
•D-M9B(E)(V)/D-M9N(E)(V)/D-M9P(E)(V)
PLC: Programmable Logic Controller
Switch part no. D-M9N(E) D-M9N(E)V D-M9P(E) D-M9P(E)V D-M9B(E) D-M9B(E)V
Wiring 3-wire 2-wire
Output NPN PNP -
Lead wire
In line Perpendicular In line Perpendicular In line Perpendicular
orientation
Applicable load IC circuit/Relay/PLC 24 VDC Relay/PLC
Power supply
5/12/24 VDC (4.5 to 28 VDC) -
voltage
Current
10 mA or less -
consumption
Load voltage 28 VDC or less - 24 VDC (10 to 28 VDC)
Load current 40 mA or less 2.5 to 40 mA
Internal voltage 0.8 V or less at load current of 10 mA
4 V or less
drop (2 V or less at load current of 40 mA)
Current leakage 100 µA or less at 24 VDC 0.8 mA or less
Operating time 1 ms or less
Normally open (normal direction) output:
When magnetic force is detected
Indication light The Red LED turns ON
Normally closed (inverted) output:
When magnetic force is not detected
Electrical entry Grommet
Vinyl sheath cable
Lead wire
φ2.6, 0.15 mm2, 2-wire (D-M9B(E)(V)), 3-wire (D-M9N(E)(V),D-M9P(E)(V))
Impact proof 1000 m/s2
Insulation
50 MΩ or more under the test voltage 500 VDC (between case and cable)
resistance
Withstand voltage 1000 VAC 1 min. (between case and cable)
Ambient
-10 to 60 °C
temperature
Enclosure IEC 60529 criteria IP67, JISC0920 watertight construction

-23-

No.D-※S-OMJ0004-G
•D-M9BW(V)/D-M9NW(V)/D-M9PW(V)
PLC: Programmable Logic Controller
Switch part no. D-M9NW D-M9NWV D-M9PW D-M9PWV D-M9BW D-M9BWV
Wiring 3-wire 2-wire
Output NPN PNP -
Lead wire
In line Perpendicular In line Perpendicular In line Perpendicular
orientation
Applicable load IC circuit/Relay/PLC 24 VDC Relay/PLC
Power supply
5/12/24 VDC (4.5 to 28 VDC) -
voltage
Current
10 mA or less -
consumption
Load voltage 28 VDC or less - 24 VDC (10 to 28 VDC)
Load current 40 mA or less 2.5 to 40 mA
Internal voltage 0.8 V or less at load current of 10 mA
4 V or less
drop (2 V or less at load current of 40 mA)
Current leakage 100 µA or less at 24 VDC 0.8 mA or less
Operating time 1 ms or less
Operating position: The Red LED turns ON
Indication light
Optimum operating position: The Green LED turns ON
Electrical entry Grommet
Vinyl sheath cable
Lead wire
φ2.6, 0.15 mm2, 2-wire (D-M9BW(V)), 3-wire (D-M9NW(V),D-M9PW(V))
Impact proof 1000 m/s2
Insulation
50 MΩ or more under the test voltage 500 VDC (between case and cable)
resistance
Withstand voltage 1000 VAC 1 min. (between case and cable)
Ambient
-10 to 60 °C
temperature
Enclosure IEC 60529 criteria IP67, JISC0920 watertight construction
Standard CE/UKCA marked

-24-

No.D-※S-OMJ0004-G
■Dimensions
•D-M9B(W/E)/D-M9N(W/E)/D-M9P(W/E)

•D-M9B(W/E)V/D-M9N(W/E)V/D-M9P(W/E)V

-25-

No.D-※S-OMJ0004-G
•Pre-wired connector
A
•D-M9### B PC

•D-M9###DPC

-26-

No.D-※S-OMJ0004-G
 Revision history

A: Standardize each contents for series D-M9.

B: Modify the contents.
C: Limited warranty and Disclaimer are added.
D: Solid state auto switch changed.
D-M9## added.
E: Solid state auto switch changed.
D-M9#E(V) added. [June 2018]
F: Contents revised in several places.
[March 2019]
G: Contents are added. [July 2022]

4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN

Tel: + 81 3 5207 8249 Fax: +81 3 5298 5362
URL https://www.smcworld.com

Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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No.D-※S-OMJ0004-G