Page 1
Important
Point
Reference
Important
• When disposing the GS (Lock), always follow the applicable
DANGER
NOTICE
DANGER
96M15312
DANGER
DANGER
DANGER
requirements of the laws, rules, regulations and standards
in the country or region where the GS (Lock) is used.
• Dispose of this product as industrial waste.
Safety Interlocking
Switch
GS (Lock)
Instruction Manual
Detailed information and use of the GS (Lock) is also described in the "GS
(Lock) User's manual". In order to acquire the "GS (Lock) User's manual",
download it from the KEYENCE website or call the nearest KEYENCE office.
<KEYENCE website> www.keyence.com/global.jsp
This manual explains items such as the handling, operation, and precautions
for the Safety Interlocking Switch GS (Lock). Read this manual carefully and
thoroughly understand its contents to use the GS (Lock) to the full extent of its
capabilities.
Also, keep this manual in a safe place for future reference.
Ensure that the end user of this product receives this manual.
This manual is the original instruction manual.
Symbols
It indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
It indicates a situation which, if not avoided, could result in
product damage as well as property damage.
It indicates cautions and limitations that must be followed
during operation.
It indicates additional information on proper operation.
Environment of use
• Do not use the GS (Lock) in an environment (temperature,
humidity, interfering light, etc.) that does not conform to the
specifications contained in this manual.
• Do not use a device that emits strong electromagnetic
waves near the GS (Lock).
• This product is not intended for use as an explosion-proof
product. Do not use this product in a hazardous location
and/or potentially explosive atmosphere.
• Do not use the GS (Lock) in the presence of substances,
such as heavy smoke, particulate matter, or corrosive
chemical agents, that may induce deterioration in product
quality.
• Be sure to absolutely confirm that there is nobody in the
hazardous zone, before the interlock is released (i.e. the
machine system restarts) by the interlock reset mechanism.
• Indoor use only.
Target machines for installation
• It must be possible to perform an emergency stop on the
machine to which the power-to-lock type GS (Lock) is
installed at any and all operation points during the
operation cycle. Also, do not use the power-to-lock type GS
(Lock) on machines that have irregular stop times.
• Do not use the GS (Lock) to control (stop forward motion,
etc.) trains, cars and other transportation vehicles, aircraft,
equipment for use in space, medical devices, or nuclear
power generation systems.
Circuit design and wiring
• Be sure to turn the power supply off before performing
electrical wiring.
• Perform electrical wiring according to the electrical
standards, regulations and laws in the country or area in
which the GS (Lock) will be used.
• Use cables with length less than or equal to the
specification in this manual. Usage of cables longer than
the specified length may cause the improper operation of
safety functions and may cause a dangerous situation.
It indicates tips for better understanding or useful information.
Safety Precautions
General precautions
• KEYENCE does not guarantee the function or performance
of the GS (Lock) if it is used in a manner that differs from
the GS (Lock) specifications contained in this manual or if
the GS (Lock) is modified by the customer.
• The GS (Lock) can only be used in combination with
dedicated actuators. It cannot be used in combination with
other actuators or similar devices.
• Do not bypass the GS (Lock), remove it or change its
installation orientation after installation.
• Do not use a replacement actuator to bypass the GS (Lock).
Store replacement actuators strictly to prevent their easy
access.
• When using the GS (Lock) to protect machine operators
against a hazard or hazardous zone or when using the GS
(Lock) as a safety component for any purpose, always
follow the applicable requirements of the laws, rules,
regulations and standards in the country or region where
the GS (Lock) is used. For such regulations, you should
directly contact the regulatory agency responsible for
occupational safety and health in your country or region.
Depending on the type of machine on which the GS (Lock) is
•
installed, there may be special safety regulations related to
the use, installation, maintenance, and operation of the safety
component. In such a case, you must fulfill such safety
regulations. The responsible personnel must install the GS
(Lock) in strict compliance with such safety regulations.
• The responsible personnel must do the training to the
assigned personnel for the correct use, installation,
maintenance, and operation of the GS (Lock).
• The user of the machine must receive specialized training
related to the GS (Lock), and must then understand and
adhere to the safety restrictions, laws, and regulations in
the country or area in which the GS (Lock) is being used.
• If the GS (Lock) does not operate correctly, the user of the
machine must report this information to the party
responsible for the use of the GS (Lock) and immediately
stop the machine.
• The GS (Lock) is designed with the assumption that it would
be correctly installed in accordance with the installation
procedures described in this manual and correctly operated
according to the instructions in this manual. You must
perform an appropriate installation of the GS (Lock) after
performing a sufficient risk assessment for the target
machine.
• Be sure to absolutely confirm that there is nobody in the
hazardous zone, before you remove the GS (Lock) from the
machine for replacement or disposal.
• Machine builder must consider the time the machine with
inertia takes to stop.
Precautions on Regulations and Standards
CE Marking
KEYENCE Corporation has confirmed that this product complies with the
essential requirements of the applicable EU Directive(s), based on the
following specifications. Be sure to consider the following specifications when
using this product in the Member States of European Union.
• Machinery Directive
• RE Directive
The GS (Lock) is a safety component defined in the EU Machinery Directive
Annex V and has been certified by TÜV SÜD Product Service GmbH. The GS
(Lock) complies with the following EN Standards.
• EN 61508
• EN 62061
• EN ISO13849-1
• EN ISO14119
• EN 60947-5-3
• EN300 330
The full text of the EU declaration of conformity is available at the following
internet address: http://www.keyence.com/cedoc
• Frequency band of operation 123kHz
• Maximum radio-frequency power 60 dBμV/m
These specifications do not give any guarantee that the end-product with this
product incorporated complies with the essential requirements of RE and
Machinery Directive. The manufacturer of the end-product is solely
responsible for the compliance on the end-product itself according to these
Directives.
CSA Certificate and North American Regulations
The GS (Lock) complies with the following UL and CSA standards and
regulations, and has received CSA certification.
Applicable standards:
• CAN/CSA C22.2 No. 61010-1
• UL61010-1
Be sure to consider the following specifications when using this product as a
product certified by CSA.
• Overvoltage category II
• Pollution degree 3
• Install this product at the altitude of 2000 m or less.
• Indoor use only.
• When using this product, use the following power supply. CSA or UL
certified power supply that provides Class 2 output as defined in the CEC
(Canadian Electrical Code) and NEC (National Electrical Code).
Applicable standard:
• FCC Part15 Subpart B, Class A Digital Device
• FCC Part15 Subpart C
• ICES-003, Class A Digital Apparatus
• RSS-210
1
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Page 2
This device complies with part 15 of FCC Rules and Innovation, Science and
Reference
Lock bolt
Highly visible indicator
Center indicators
Actuator
Main unit
Auxiliary
release
mechanism
Metal head
DANGER
DANGER
From the front
From the side
Horizontal
Not inserted in
the insertion slot
Reverse
Economic Development Canada's licence-exempt RSSs. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Le présent appareil est conforme à la partie 15 des règles de la FCC et aux
normes des CNR d’Innovation, Sciences et Développement économique
Canada applicables aux appareils radio exempts de licence. L’exploitation
est autorisée aux deux conditions suivantes : (1)l’appareil ne doit pas
produire de brouillage, et (2) l’appareil doit accepter tout brouillage subi,
même si le brouillage est susceptible d’en compromettre le fonctionnement.
FCC CAUTION
Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for
a Class A digital device, pursuant to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in
a residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.
Chapter 1 Before Operation
1-1 Overview and Configuration
The GS (Lock) is a Type4 Interlocking Device with guard lock based on
ISO14119.
Coding level: Low or high (switchable)
“4-7 Coding Level” (page 7)
By combining the GS (Lock) with a door or similar movable safety guard and
with a safety-related control system, it is possible to prevent the door or
similar part from opening during hazardous machine operations.
Optional parts
z Replacement actuator
GS-A21
1-3 Package Contents
Main unit
• Sensor (main unit)
• Actuator
• Instruction Manual
Chapter 2 Installation
2-1 Installation Conditions
Note the following items before installation.
The effect of surrounding metal
The sensor’s operating distance may be affected by the
presence of metal in the surrounding area. After installation,
determine the minimum safety distance based on the actual
operating distance and check if it is provided appropriately.
Sensor and actuator orientation
Correct installation orientations
The GS (Lock) can also be used for other purposes such as
protecting manufacturing processes.
1-2 Product List
Main unit
For details on the main unit models, see “5-1 Model Number Description”
(page 7).
M12 connector type cables
z Standard cables
Use this cable in combination with a main unit (connector type) or
extension cable.
Typ e Model
Standard
Advanced
GS-P8C5
GS-P8C10 10 m
GS-P12C5
GS-P12C10 10 m
function
GS-P12C20 20 m
z Extension cables
Typ e Model
GS-P8CC1
Standard
Mounting brackets
z For main unit and actuator set
GS-B21
z For actuator
GS-B31, GS-B33, GS-B41, GS-B43
GS-P8CC5 5 m
GS-P8CC10 10 m
Number of pins
8
12
Number of pins
8
Length
5 m
5 m
Length
1 m
Incorrect installation orientations
• Install the GS (lock) so that the lock bolt inserts securely
into the sensor’s insertion slot when the door or similar
object to which the actuator is installed is closed.
• Do not use the GS (Lock) as a mechanical stopper.
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Page 3
Mutual interference
50 mm or more 50 mm or more
50 mm or more
M5 screws
Tightening torque: 3.0 N⋅m
Mounting bracket GS-B31
M6 screws
Tightening torque: 5.2 N⋅m
Strength class:
Carbon or alloy steel: Property class 8.8 or higher
Stainless steel: Property class **-70 or higher
M5 screws
Tightening torque: 3.0 N⋅m
Strength class:
Carbon or alloy steel: Property class 8.8 or higher
Stainless steel: Property class **-70 or higher
Plastic pipe
M5 screws
Tightening torque: 3.0 N⋅m
M6 screws
Tightening torque: 5.2 N⋅m
Strength class:
Carbon or alloy steel: Property class 8.8 or higher
Stainless steel: Property class **-70 or higher
When using multiple GS (Lock) units in close proximity, they may malfunction
due to mutual interference. To prevent mutual interference, install the GS
(Lock) units as shown below.
Distance between sensors
To support the installation of screw, a plastic pipe is pre-inserted to the
3
insertion slot in the metal head. Insert a screw into this pipe to smoothly set
the screw in appropriate position.
4
2-2 Installation Method
Installing the unit on a hinged door
1
2
Installing the unit on a sliding door
1
2
3
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3
Reference
Important
DANGER
M5 screws
Tightening torque: 3.0 N⋅m
Strength class:
Carbon or alloy steel: Property class 8.8 or higher
Stainless steel: Property class **-70 or higher
Plastic pipe
2
3
4
8
5
6
7
1
10
6
1
9
3
4
5
7
8
12
11
2
2-3 Cascade Connection Between Units
Multiple GS (Lock) and GS (Non-contact) units can be connected in series (in
a cascade connection).
This makes it possible to monitor the opening and closing of multiple doors or
similar items on the same machine.
For the wiring method, see "Cascade connection wiring example".
Chapter 3 Wiring
4
To support the installation of screw, a plastic pipe is pre-inserted to the
insertion slot in the metal head. Insert a screw into this pipe to smoothly set
the screw in appropriate position.
5
• To minimize defeat possibilities, GS (Lock) should be
installed in a position where the accessibility to GS (Lock)
is prevented (e.g. mounting out of reach, physical
obstruction or shielding or mounting in hidden position),
otherwise use non-detachable fixing to prevent dismantling
or de-positioning of GS (Lock) (e.g. Using a flat head screw
and plugging the slot on the screw head with a highstrength threadlocker after tightening the screw or other
equivalent fixing system).
Refer ISO 14119 for more information to minimize defeat
possibilities.
• Securely tighten the screws for the sensor, actuator, and
mounting brackets according to the specified tightening
torques.
• To prevent self-loosening, use screw locker on the screws
fixing the GS (Lock).
• If the dedicated bracket is not appropriate, please contact
nearest KEYENCE office.
• When replacing the sensor or actuator, do so by following the
same procedure.
• The appropriate screws to mount the main unit and the bracket
must be purchased separately.
3-1 Power Supply
If the power supply for the GS (Lock) is the converting type, the power supply
for the GS (Lock) must meet the conditions listed below in order to meet the
requirements specified in ISO 14119, IEC 60947-5-3, UL 61010-1, and CAN/
CSA-C22.2 No. 61010-1.
(a) The rated output voltage is within 24 V DC ±20 % (Ripple P-P 10 % or
less, Class2, SELV, Overvoltage category II).
(b) The insulation between the primary and secondary circuits is reinforced or
double insulation.
(c) The power supply complies with the laws, regulations, and standards
related to items such as electrical safety and electromagnetic
compatibility (EMC) in the country or area in which the GS (Lock) will be
used.
When the power supply used with the GS (Lock) is shared
with other machines or electrical products, the voltage
supplied to the GS (Lock) may drop due to temporary
increases in the current consumption of these other machines
and the GS (Lock) may also be affected by the noise
generated by these other machines. Errors or other such
problems may occur with the GS (Lock) in this situation, so it
is strongly recommended to avoid sharing the power supply
of the GS (Lock) with other machines or electrical products.
3-2 Cable Wire Colors and Functions
Standard type (loose wires or M12 connector, 8 pins)
Pin
number
Advanced function type (M12 connector, 12 pins)
number
Pin layout (Main unit, M12 connector type)
Standard type
(M12, 8 pins, male)
Wire color Function
1 Gray AUX output
2 Brown +24 V
3 Light blue Lock control input
4 Red/white Safety input 2
5 Black OSSD1
6 White OSSD2
7Blue 0 V
8 Red/black Safety input 1
Pin
Wire color
1 Brown +24 V +24 V +24 V
2 Red/black Safety input 1 Safety input 1 Safety input 1
3 Blue 0 V 0 V 0 V
4 Black OSSD1 OSSD1 OSSD1
5 Gray AUX output 1 AUX output 1
6 Red/white Safety input 2 Safety input 2 Safety input 2
7 White OSSD2 OSSD2 OSSD2
8Pink
9 Gray/black AUX output 2 AUX output 2 AUX output 2
10 Light blue Lock control input 1 Lock control input 1 Lock control input 1
11 Yellow Reset/EDM input Reset/EDM input Reset/EDM input
Light blue/
12
black
Power-to-release Power-to-lock
– Lock link mode
Interlock/
EDM selection input
Lock control input 2
Function
Interlock/
EDM selection input
OSSD operation
switching input 1
Advanced function type
(M12, 12 pins, male)
Open/close link
mode
OSSD operation
switching input 2
Interlock/
EDM selection input
OSSD operation
switching input 1
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3-3 Wiring Example
11: Yellow (reset/EDM input)
8: Pink (interlock/EDM selection input)
1: Brown (+24 V)
3: Blue (0 V)
5: Gray (AUX output 1)
10: Light blue (lock control input 1)
12: Light blue/black (lock control input 2)
7: White (OSSD2)
2: Red/black (safety input 1)
4: Black (OSSD1)
6: Red/white (safety input 2)
9: Gray/black (AUX output 2)
11: Yellow (reset/EDM input)
8: Pink (interlock/EDM selection input)
1: Brown (+24 V)
3: Blue (0 V)
5: Gray (AUX output 1)
10: Light blue (lock control input 1)
12: Light blue/black (lock control input 2)
7: White (OSSD2)
2: Red/black (safety input 1)
4: Black (OSSD1)
6: Red/white (safety input 2)
9: Gray/black (AUX output 2)
K1 K2
K1
K2
S1-1
General-purpose PLC
OSSD
INPUT
LOCK
MODE
GS-51P5
OSSD
INPUT
LOCK
MODE
GS-51P5
Lock
control
device
1st unit
GS (Lock)
PNP output
Advanced function type
Power-to-release type
Interlock: Manual
EDM: Use
Cascade connection: Yes
2nd unit
GS (Lock)
PNP output
Advanced function type
Power-to-release type
Interlock: Automatic
EDM: Do not use
Cascade connection: No
K1, K2: External device (force guided relay, magnet connector,
etc.)
S1-1: Reset switch (N.O.)
Black or white
Blue
+24V
0 V
External device
Main
circuit
Brown
Brown
Black or white
Blue
+24 V
0 V
External device
Main
circuit
Brown
(Input wire)
Blue
+24 V
Main
circuit
0 V
Brown
(Input wire)
Blue
+24 V
0 V
Main
circuit
Brown
(Output
wire)
Blue
+24 V
0 V
Input
device
Main
circuit
Cascade connection wiring example
Wire the safety inputs of a GS (Lock) to the OSSDs of the next GS (Lock) or
GS (Non-contact) to implement a cascade connection.
• “4-1 OSSD” (page 5)
• “4-2 Safety Input” (page 6)
3-4 I/O Circuit Diagrams
Output circuit (PNP type) Output circuit (NPN type)
Input circuit (PNP type) Input circuit (NPN type)
AUX output circuit (PNP/NPN common)
Cable length and number of connected units
B: Maximum number of connected units 25
Contact KEYENCE for the maximum number of connected units when using a
cascade connection that also includes GS (Non-contact) units.
A: Maximum cable length 30.3 m
Chapter 4 Functions
The functions that can be used with the GS (Lock) vary depending on the
model of the main unit (standard type/advanced function type, Power-torelease type/Power-to-lock type).
Number of pins 8 12
Lock method
OSSD 3333
OSSD operation
switching (OSSD
operation switching
input)
Safety input 3333
Number of lock control
inputs
Interlock function
EDM function
Number of AUX outputs 1 1 2
Auxiliary release 3333
Coding level switching 3333
* When the OSSD operation is set to open/close link mode, the number of
AUX outputs is one.
4-1 OSSD
An OSSD output is a safety output for the safety-related part of a machine
control system.
OSSD 1/2 is a pair of safety outputs that are redundant.
The GS (Lock) generates self-diagnosis signals on its internal control circuit
to perform diagnostics on the OSSD. These signals periodically force the
OSSD into a temporary OFF-state when the OSSD is in the ON-state.
If the internal control circuit receives a feed-back signal (OFF-signal) based
on the self-diagnosis, the GS (Lock) determines that its OSSD is operating
normally. If the OFF-signal is not returned to the internal control circuit, the GS
(Lock) determines that there is a problem with the OSSD or wiring and goes
to an error state.
OSSD operation
The OSSDs go to OFF state:
• During startup, in the error state, when switching the coding level
When all the conditions shown below are met during normal operation, the
OSSDs go to ON state. (*1)
z Power-to-release type
• The sensor has detected an actuator.
• Lock control input(s) is(are) OFF.
• Safety inputs are ON.
• The lock bolt is inserted in the insertion slot of the main unit correctly.
5
Standard type Advanced function type
Power-to-
release type
Power-to-lock
type
Power-to-
release type
Power-to-lock
type
- - - 3
1121
- -
- -
33
33
E GS (Lock) IM
*
2
Page 6
z Power-to-lock type
Reference
Important
DANGER
DANGER
Advanced function type
DANGER
DANGER
DANGER
In lock link mode (initial setting):
• The sensor has detected an actuator.
• Lock control input is ON.
• Safety inputs are ON.
• The lock bolt is inserted in the insertion slot of the main unit correctly.
In open/close link mode:
• The sensor has detected an actuator.
• Safety inputs are ON.
*1: The OSSDs keep OFF state in the interlock reset ready state.
OSSD operation switching
The OSSDs operation can be switched on the advanced function, Power-tolock type. The OSSDs operation is determined by the wiring of the OSSD
operation switching input during startup.
• Lock link mode: Links the OSSDs with the lock operation.
OSSD operation switching input 1: Open
• Open/close link mode: Links the OSSDs with the open/close operation of
OSSD operation switching input 1: Connected to 0 V
OSSD operation switching input 2: Connected to 24 V
• For the wiring to a safety-related machine control system,
the output of both OSSD 1 and OSSD 2 must be used by the
safety-related machine control system in order to create a
safety system.
• If only one OSSD output is used to construct the machine’s
control system, an OSSD malfunction will make it
impossible to stop the machine, which may lead to
extremely dangerous situations including serious injury to
or death of the machine’s user.
• When using a PNP type, do not cause a short-circuit
between the OSSD and +24V. Otherwise, the OSSDs will
stay in the ON-state and it will cause a dangerous situation.
• When using a PNP type, be sure to connect the load
between the OSSD and 0 V. Connecting this between the
OSSD and +24 V by mistake will invert the OSSD operation
from its normal behavior, which is extremely dangerous.
• When using an NPN type, do not cause a short-circuit
the door or similar object.
between the OSSDs and 0V. Otherwise, the OSSDs stay in
the ON-state and it will cause a dangerous situation.
• When using an NPN type, be sure to connect the load
between the OSSD and +24 V. Connecting this between the
OSSD and 0 V by mistake will invert the OSSD operation
from its normal behavior, which is extremely dangerous.
• To prevent malfunctions caused by ground faults on the
OSSD output wire, perform wiring in a manner such that the
requirements specified in paragraph 9.4.3 of IEC 60204-1
are met.
4-2 Safety Input
This function controls the OSSDs of the GS (Lock) with input signals from
sensors or similar devices connected to the safety inputs.
Safety input 1 and safety input 2 form a safety input pair. If safety input 1 or
safety input 2 goes to OFF state, the OSSDs go to OFF state.
Multiple GS units can be connected and used in an expanded system (with a
cascade connection) by connecting the OSSDs of a different GS (Lock) or GS
(Non-contact) to the safety inputs. The system can be expanded to include
up to twenty five units in the case of the GS (Lock). For details, see
“Cable length and number of connected units” (page 5).
• Wire the safety inputs as shown below when they are not in use.
PNP type: Short circuit to 24 V.
NPN type: Short circuit to 0 V.
• If safety input 1 and safety input 2 are mismatched for 3
seconds or more a Safety Input Error will occur.
Emergency stop switch/button wiring
Wiring an emergency stop switch/button to the safety inputs makes it
possible to perform an emergency stop on the machine by pressing the
emergency stop switch/button.
• Use an emergency stop switch/button that has two or more
independent, NC (normally closed) contacts. For the
requirements related to emergency stop switches/buttons,
see IEC 60204-1, ISO 13850, and all other requirements,
regulations, standards, and laws related to occupational
safety and health in the country or area where the GS (Lock)
will be used. For such regulations, you should directly
contact the regulatory agency responsible for occupational
safety and health in your country or region.
• Ensure that the device does not start or restart automatically
when the emergency stop switch/button is reset.
• Only the devices shown below can be connected to the
safety inputs. Do not connect any other devices.
GS (Lock) OSSDs, GS (Non-contact) OSSDs, and emergency
•
stop switch/button
• When using a PNP sensor, please connect the OSSDs of the
PNP type GS (Lock) or GS (Non-contact) to the safety
inputs.
• When using a NPN sensor, plesae connect the OSSDs of the
NPN type GS (Lock) or GS (Non-contact) to the safety
inputs.
4-3 Lock Function
The lock function makes it possible to keep closed the door or similar item to
which the GS (Lock) actuator is installed by maintaining a physical
connection between the type and actuator.
The operation of the lock function varies depending on the model of the GS
(Lock) main unit (Power-to-release type, Power-to-lock type).
Typ e Power-to-release type Power-to-lock type
Actuator detection status Not detected Detected Not detected Detected
Lock Control
Power
Input ON
ON
Lock Control
Input OFF
Power OFF Lock on close Locked Lock released Lock released
On the advanced function, Power-to-release type, lock control input 1 and
lock control input 2 operate as a lock control input pair.
•
When using the lock function for a safety-related control
system to achieve PLe, be sure to wire both lock control
inputs (lock control input 1 and lock control input 2) to the
machine’s control system in order to construct a safety
system.
•
The GS (Lock) does not monitor between lock control inputs
for short circuits. When using the two lock control inputs to
achieve PLe, use a safety PLC or some other such device that
can detect short circuits on outputs.
•
When using only one lock control input for the machine’s
control system, the lock control input malfunctioning will
make it impossible to perform locking.
•
When using a PNP type, do not cause a short-circuit between
the lock control input and +24 V. Doing so will make the lock
control input ON at all times, which may be dangerous.
•
When using an NPN type, do not cause a short-circuit between
the lock control input and 0 V. Doing so will make the lock
control input ON at all times, which may be dangerous.
•
To prevent malfunctions caused by ground faults on the lock
control input wire, perform wiring in a manner such that the
requirements specified in paragraph 9.4.3 of IEC 60204-1 are
met.
Power-to-release type lock function
<Lock operation>
On the Power-to-release type, the lock activates immediately when the
actuator is detected.
<Lock release operation>
On the Power-to-release type, setting the lock control input(s) to ON releases
the lock.
The lock can also be released manually by using the auxiliary release on the
front or back of the unit. For details, see “Auxiliary release” (page 6).
• If the power supply of the GS (Lock) main unit is
interrupted, the door will be locked, so it is possible for
people to be trapped within the chamber.
• Check that the machine has stopped, and then release the
lock.
Power-to-lock type lock function
<Lock operation>
On the Power-to-lock type, the lock activates when the lock control input turns
ON with the actuator already detected.
<Lock release operation>
On the Power-to-lock type, setting the lock control input to OFF or interrupting
the power supply of the GS (Lock) releases the lock.
The lock can also be released manually by using the auxiliary release on the
front or back of the unit.
Do not use the Power-to-lock type lock function with a safetyrelated control system. The lock is released when the power
supply of the GS (Lock) is interrupted, so operators may be
exposed to dangerous situations depending on the operating
status of the machine.
Auxiliary release
This is a mechanism for manually releasing the lock of the GS (Lock). Use it to
manually release the lock in situations where the type malfunctions.
The auxiliary release mechanism has two states.
Normal state: The lock can be applied by way of lock control input(s).
Released state: The lock cannot be applied regardless of the state of the
• A separate auxiliary release key is required in order to
switch between the normal and released states. A hex key
with an across-flats size of 3 mm (M4 size) can be used as
the auxiliary release key.
• Provide the protection on the auxiliary release mechanism
to prevent unintended actuation (e.g. protected by seal with
security screw paint).
• With the auxiliary release mechanism set to the released
state, the lock will not be applied even when the door is
closed. After using the auxiliary release, return the auxiliary
release mechanism to the normal state and seal it again
prior to normal use.
Lock released Lock released Lock on close Locked
Lock on close Locked Lock released Lock released
For details, see “Auxiliary release” (page 6).
lock control input(s).
The lock operation will not be executed even in states in
which it is possible.
E GS (Lock) IM
6
Page 7
4-4 Interlock Function
Point
DANGER
DANGER
Advanced function type
Advanced function type
GS - 5 1 P * 5
Cable length
C: M12 connector,
Blank: Loose wires
P: PNP, N: NPN
1: Standard, 3: Advanced function
5: Power-to-release
7: Power-to-lock
* Only necessary when
using loose wire
connection
GS - P 8 C 5
Cable length
C: Standard cable
CC: Extension cable
8: 8 pins (standard)
12: 12 pins (advanced function)
Interlock is a function that prevents the OSSDs from automatically going into
the ON-state from the OFF-state. This prevents the unintended start-up and/or
the unintended restart of the machine if the interlock is applied to the GS
(Lock). It is necessary to perform the reset operation in order for the GS
(Lock) to go back to normal operation from the interlock condition.
On the advanced function type, the interlock function setting can be selected
from two types: Automatic and Manual.
The interlock function cannot be set on the standard type. The
interlock function is fixed to Automatic.
Automatic and Manual indicate the following operations.
Automatic:
The OSSDs immediately switches to the ON state when the conditions for doing
so—such as the unit being in the lock state with the door closed—are met.
Manual:
Even if the condition for switching the OSSDs to the ON state are met, the
OSSDs maintain the OFF state (interlock state).
<Terminating the interlock state>
To set the OSSDs to the ON state and to start the machine, close the door to
which the GS (Lock) has been installed and perform the reset operation after
the preparations for starting the machine are complete. This sets the OSSDs
to the ON state and terminates the interlock state.
Interlock function settings
Use the wiring to configure the settings. The wiring method varies depending
on whether the “4-5 EDM Function” (page 7) is used.
Interlock
function
Automatic Not used 0 V 0 V
Automatic Used
Manual Not used
Manual Used
EDM function Reset/EDM input
Connected to 24 V via the NC
relay contacts
Connected to 24 V via a NO
reset switch
Connected to 24 V via a NO
reset switch and the NC relay
contacts
• Be sure to absolutely confirm that there is nobody in the
hazardous zone before the interlock condition is terminated
(i.e. the machine system restarts) by the interlock reset
mechanism.
• Install the switch, etc. for releasing the interlock state in a
position where it is possible to check the entirety of the
hazardous zone and where the switch, etc. cannot be
operated from within the hazardous zone.
• When the interlock function is set to Automatic, it is
necessary to ensure the safety of the entire control system
in order to prevent unexpected starts from occurring.
• Exercise caution to prevent the reset/EDM input from
forming a short circuit with other inputs or outputs.
4-5 EDM Function
The GS (Lock) can monitor the state of external devices, such as a safety relay
or contactors that are connected to the OSSDs, in order to detect the failure of
the external device. This monitoring function is called the EDM function.
EDM function settings
Use the wiring to configure the settings. The wiring varies depending on
whether the interlock function is used. For details, see “4-4 Interlock
Function” (page 7).
4-6 AUX Output
This is an informational output used to check the operating status of the GS
(Lock). The operation of the AUX output varies depending on the type of the
main unit.
The AUX outputs cannot be used as the safety outputs to a
safety-related control system.
4-7 Coding Level
The GS (Lock) has two coding levels.
Coding level: Low
(multi operation)
Any actuator is detected when it enters the range of
the operating distance from the type. (Initial setting)
Only the specific actuator that the type has been
taught to detect is detected when it enters the range of
Coding level: High
(unique operation)
the operating distance from the type. The type does
not respond if an actuator other than the actuator that it
has been taught to detect is within the range of the
operating distance.
Interlock/
EDM function selection
input
Open
24 V
24 V
Chapter 5 Specifications
5-1 Model Number Description
Main unit
Cable
5-2 Specifications
Specifications
GS-
GS-
GS-
GS-
GS-
GS-
GS-
GS-
Model
Lock type Power-to-release type Power-to-lock type
Type Standard type
Output type PNP NPN PNP NPN PNP PNP PNP NPN PNP NPN PNP PNP
Response
(ms)
time
Lock
*1*2
Locking force (Fzh) Min. 2,000 N
Alignment tolerance
of lock
Mechanical life-span 1 mi llion cycles or more (with door operation speed of 1m/s)
Lock
Acceptable
operation frequency
*4
Door radius Min. 250 mm
Auxiliary release Front, back
Cascading Max. 25 units
Output Transistor outputs × 2
Max. load current PNP: Max. 150 mA, NPN: Max. 100 mA
Residual voltage
(during ON)
Control
output
OFF state voltage Max 2.0 V (with a cable length of 5 m)
(OSSD
output)
Leakage current Max. 0.5 mA
Max. capacitive load 2.2 μF
Load wiring
resistance
Output Transistor output
AUX
Number of output 1 2 1 2
(Nonsafety-
Max. load current 50 mA
related
Residual voltage
output)
(during ON)
Safety input Approx.1.5 mA × 2
Reset/EDM input External
input
(Short-
Lock control input Approx. 2.5 mA × 1
circuit
current)
OSSD operation
switching input
Power voltage 24 V DC ±20 % (Ripple P-P 10 % or less, Class2)
Power
supply
Power consumption 3.4 W
Protection circuit
Enclosure rating
Operating ambient
temperature
Storage temperature -25°C to +70°C (No freezing)
Environ-
Operating relative
mental
humidity
resistance
Storage relative
humidity
Vibration resistance
Shock resistance 30 G in X, Y, Z directions 6 times each axis (IEC 60947-5-3)
Lock →
Unlock
Unlock →
Lock
51P5
51N5
51P10
51N10
51PC
53PC
71P5
Advanced
function
type
220 ms 320 ms
220 ms
±2 mm
1 Hz
Max 2.5 V (with a cable length of 5 m)
Max. 2.5 Ω
Max 2.5 V (with a cable length of 5 m)
Approx.
10 mA
× 1
Approx.
2.5 mA
× 2
-
Reverse current protection, short-circuit protection and
surge protection for each output
IP65/67(IEC60529), IP69K(ISO 20653) (TÜV SÜD certif ied),
Enclosure Type 3/4X/12/13 (NEMA250)
-20°C to +55°C (No freezing)
5% to 95%RH
5% to 95%RH
10 to 55 Hz, Double amplitude 2.0 mm, 5 minutes
in each of the X, Y, and Z directions (IEC 60947-5-3)
7
71N5
Standard type
*3
Approx. 2.5 mA × 1
*7
GS-
71P10
-
*8
E GS (Lock) IM
GS-
71N10
GS-
71PC
GS-
73PC
Advanced
function
type
*5
Approx.
10 mA
× 1
Approx.
2.5 mA
*6
× 2
Page 8
GS-
OSSD
LOCK
MODE
GS-51P5
INPUT
READY
(1) Highly visible indicator
(2) OSSD indicator
(3) INPUT READY indicator
(4) LOCK indicator
(5) MODE indicator
GS-
GS-
GS-
GS-
GS-
GS-
GS-
Model
Main unit
Material
Actuator
Weight
*1 Risk time a ccording to IEC60947-5-3 is 150 ms + 2 ms × (number of cascaded units - 1).
*2 In case OSSD operation is open/close link mode, Detect → Not detect: 20 ms + 2 ms × (number of
cascaded units - 1), Not detect → Detect: 30 ms + 25 ms × (number of cascaded units - 1)
*3 430 ms when locked at the same time with actuator detection.
*4 Acceptable door operation frequency is 3 Hz in case OSSD operation is open/close link mode. In that
case, operation distance is Sao(OFF→ON) = 3mm, Sar(OFF→ON) = 10.5mm.
*5 The number of AUX outputs is 1 when the OSSD operation is open/close link mode.
*6 The number of OSSD operation switching inputs is 1 when the OSSD operation is lock link mode.
*7 Power consumption temporarily increases (Max. 10.5 W, Approx. 0.2 s) when the lock control input(s)
is(are) turned ON. After that, current consumption will be within the specification.
*8 When stored for a long period of time, please store it at temperature of 55°C or lower.
51P5
51N5
51P10
51N10
51PC
Case SUS304, PPS, PBT, PAR, PA66, NBR
Lock Aluminum alloy, Zinc die cast (Nickel chrome plating)
Cable PVC
Case PPS, PBT, NBR
Lock A luminum alloy, SUS303
Approx.
560 g
Approx.
770 g
53PC
Approx.
380 g
71P5
Approx.
560 g
71N5
GS-
71P10
Approx.
770 g
Safety-related parameters
Interlocking function
Mission time 20 years
Hardware fault tolerance 1
Type of element B
Performance level e
Category 4
SIL 3
Guard locking function (GS-51*)
Mission time 20 years
Hardware fault tolerance 0
Type of element B
Performance level d
Category 2
SIL 2
Guard locking function (GS-53*)
Mission time 20 years
Hardware fault tolerance 1
Type of element B
Performance level e
Category 4
SIL 3
PFH (IEC 61508)
Interlocking function 4.78×10
Guard locking function 1.74×10
-10
-10
GS-
71N10
GS-
71PC
Approx.
380 g
GS-
73PC
Chapter 6 Appendix
6-1 Indicator Descriptions
(1) Highly visible indicator
Light
Status Details
color
ON During normal operation. ON Locked Detected
Green
Blinking
Green
Blinking
and
alternately
orange
Blinking
(fast)
Orange
Blinking
(fast)
ON Door, etc. is open. OFF
Red
Blinking
OFF
- Power if OFF OFF Uncertain Uncertain
*1 ON in open/close link mode for the Power-to-lock type.
*2 Depends on lock control input(s).
Door, etc. is closed but
lock is not active.
Door, etc. is closed and
an attempt was made to
activate the lock, but the
lock has not activated
properly.
During operation with the
“High” coding level, an
actuator different from the
one that was taught was
detected.
Error during coding level
switching.
Switching coding level or
teaching for an actuator.
Error state. The GS (Lock)
has detected an error.
(2) OSSD indicator
Light
Status Details
color
Green ON The OSSD is ON. ON Locked*1Detected
Red ON The OSSD is OFF. OFF Uncertain Uncertain
OFF
-
*1 Uncertain for the Power-to-lock type and in open/close link mode for the Power-to-
release type.
*2 Uncertain for the Power-to-release type and lock released for the Power-to-lock type.
Power OFF. OFF *2 Not detected
(3) INPUT READY indicator
Light
Status Details
color
Interlock release wait
state (waiting for reset
input).
Yel lo w
ON
Blinking Safety input is OFF. OFF Uncertain Uncertain
OFF
-
Other state. Uncertain Uncertain Uncertain
*1 Uncertain in open/close link mode for the Power-to-lock type type.
(4) LOCK indicator
Light
Status Details
color
Green
OFF
ON
Blinking
-
The power is ON and the
lock is active.
State in which an attempt
was made to activate the
lock, but the lock has not
activated.
Other state.
*1 Uncertain in open/close link mode for the Power-to-lock type.
(5) MODE indicator
Light
Status Details
color
Green ON
OFF
-
OSSD operation is set to
open/close link mode.
Other state.
OSSD
status
OFF
OFF
OFF
Lock
status
Lock
*1
released
Lock
*1
released
Lock
released
Actuator
detection status
Detected
Detected
Incorrect
actuator
detected
Uncertain Uncertain
OFF *2 Uncertain
Lock
released
Not detected
OFF Uncertain Uncertain
OSSD
status
OSSD
status
OFF Locked
OSSD
status
Uncertain
OFF
Uncertain
OSSD
status
Uncertain
Uncertain
Lock
status
Lock
status
Lock
status
Locked Detected
Lock
*1
released
Uncertain Uncertain
Lock
status
Uncertain Uncertain
Uncertain Uncertain
detection status
detection status
*1
Detected
detection status
Uncertain
detection status
Actuator
Actuator
Actuator
Actuator
E GS (Lock) IM
8
Page 9
A
A
Attachable washer:
Outer diameter 10
6.6
29.8
16103
54.7
ø5.2
ø5.6 (Seat
thickness: 2)
ø5.2 (Seat
thickness: 2)
14.9
125
6.8
29.8
ø6.4 (Seat
thickness: 2)
14.9
103 16
ø6.4 (Seat
thickness: 2)
14.9
54.7
Maximum screw head height
during slide attaching: 6.2
ø10.4
Cross-sectional
view A-A
Unit: mm
50
29.8
Upper, lower, left,
and right range of
bolt motion: 2
6.4
ø9
ø12.5
16
42.9
33.8
17.8
2 x ø5.2, Counterbore
diameter: 10, Depth: 6.2
15.8
ø5.2
6.2
ø10
7.4
Unit: mm
6-2 Dimensions
Direct mounting
Main unit
Actuator
2
8 cores × blue/brown: 0.22 mm
Black, gray, red/white, red/black, white, light blue:0.14 mm
6-3 Troubleshooting
If the operation of the GS (Lock) is abnormal, identify the cause of the error
and carry out the countermeasures according to the following tables.
[A] The OSSD does not turn ON (or turns OFF unexpectedly).
Possible cause
The GS (Lock) is in the error
state.
The actuator is not detected.
The actuator is broken. Replace the actuator.
During operation with the
“High” coding level, an
actuator different from the one
that was taught was detected.
Safety inputs are not ON.
The unit is in the interlock
reset ready state.
The type has not activated
properly.
The type and actuator are at a
greater distance than the
specified operating distance
Sao (ON→OFF).
The unit is affected by the
surrounding metal.
The unit is affected by
interference from other types.
[B] The OSSD does not turn OFF (or turns ON unexpectedly).
2
Possible cause
The type and actuator are at a
shorter distance than the
specified operating distance
Sar (OFF→ON).
The unit is affected by the
surrounding metal.
The unit is affected by
interference from other types.
The cascade connection
wiring is incorrect.
The mode is open/close link
mode.
[C] The OSSD sometimes turns ON and OFF.
Possible cause
The type is subject to noise. —
The unit is affected by the
surrounding metal.
The unit is affected by
interference from other types.
The sensor and actuator are
at a distance between the
specified operating distance
Sao (OFF→ON) and Sa r (ON
→OFF).
[D] The connected device repeatedly turns the OSSD ON/OFF
at high speed (chattering).
Possible cause
The OSSD is turned OFF
periodically by the selfdiagnosis function, but the
connected device may be
recognizing this short OFF
signal.
[E] The unit does not switch to the lock state.
Possible cause
A Power-to-lock type or
Power-to-release type is being
used by mistake.
The lock control input logic is
incorrect.
The type and actuator do not
fit together well.
9
Confirmation
method
The highly visible
indicator is blinking
in red.
The highly visible
indicator is ON in
red.
The highly visible
indicator is blinking
in orange.
The INPUT READY
indicator is blinking
in yellow.
The INPUT READY
indicator is ON in
yellow.
—
Identify the cause of the error and
implement countermeasures
according to “Display details when
an error occurs.”
Bring the actuator within the
detection range.
Use the actuator that was taught to
the unit.
Turn ON the safety inputs.
Release the interlock state by
turning the RESET/EDM input ON.
See "[E] The unit does not
switch to the lock state."
— Check the installation.
— Check the installation.
— Check the installation.
Confirmation
method
— Check the installation.
— Check the installation.
— Check the installation.
The INPUT READY
indicator is OFF.
The MODE
indicator is ON in
green.
Confirmation
method
Check the safety input wiring.
Change to lock link mode if
necessary.
Check the noise environment
around the wiring.
— Check the installation.
— Check the installation.
— Check the installation.
Confirmation
method
—
Confirmation
method
Main unit model
display
The LOCK indicator
is OFF.
The highly visible
indicator is blinking
in green and
orange alternately.
Select a device that does not detect
the OSSD’s periodic OFF signal for
the connected device.
Check the model, and then replace
the unit with the correct model.
If the LOCK indicator is OFF, the
lock control input logic may be
incorrect. See “4 -3 Lock
Function” and correct the lock
control input logic.
If the highly visible indicator blinks
in green and orange alternately, it
may be the case that the lock
control input logic is correct but the
lock has not activated well.
• Check the fit of the type and
• Check that the auxiliary re lease is
Countermeasure
Countermeasure
Countermeasure
Countermeasure
Countermeasure
actuator.
in the normal state.
E GS (Lock) IM
Page 10
Copyright (c) 2018 KEYENCE CORPORATION. All rights reserved.
15312E 1098-1 96M15312 Printed in Japan
[F] No indicators light.
DANGER
Possible cause
The power is OFF or the
power supply voltage is
insufficient.
An extension cable or other
such connector cable is not
connected correctly.
Confirmation
method
Power supply
voltage or power
supply wiring
Connection status
of connector cables
Countermeasure
Ensure that the power supply
voltage is within the range in the
specifications.
Wire the power supply correctly.
If necessary, connect the parts
again.
6-4 Inspection and Maintenance
Inspect the safety function of the GS (Lock) on the basis of the results of a risk
assessment of the target machine. It is strongly recommended that, at
minimum, the following items and periods be met.
• To prevent danger due to the machine starting, thoroughly
ensure that no one is present in the hazardous zone during
inspection.
• If some error is found on the GS (Lock) as a result of the
inspection, do not operate the machine.
• Initial inspection
Items
The type and actuator are installed on the basis of the installation
conditions, installation methods, and wiring specifications specified in this
manual.
The safety functions being used (“4-1 OSSD” (page 5), “4-2 Safety Input”
(page 6), “4-3 Lock Function” (page 6), “4-4 Interlock Function” (page 7)
or “4-5 EDM Function” (page 7)) operate as intended.
• Periodic inspection
Periods
SIL3/PLe: Once/month or more, SIL2/PLd: Once/year or more (ISO 14119)
Items
If an emergency stop switch is connected to the safety input, the safety
function acts correctly when the emergency stop switch is pressed.
There are no changes in the mounting conditions of the type and actuator
or in the doors, etc. to which these devices are installed.
The door, etc. is not deformed.
There are no changes to the installation status that will affect the results of
the risk assessment carried out at the start of the installation.
The mounting screws and seals (in the case that seals have been applied
to the auxiliary release) have been applied correctly.
No excessive damage or dirt is present.
Especially in the following cases, check the same details as the initial
inspection.
• When a change is made to the installation, wiring, or functions
• When the sensor or actuator is replaced
• When the equipment is not used for a long period of time
• When a defect occurs
Store the inspection results together with the machine’s records.
Errors found on the sensor or actuator cannot be repaired by the customer.
Replace the product with a new one or contact the nearest KEYENCE office.
6-5 Cleaning
If it is unavoidable that metal powder or a similar substance will accumulate
near the lock pin of the sensor main unit, clean the product periodically.
WARRANTIES AND DISCLAIMERS
(1) KEYENCE warrants the Products to be free of defects in materials and
workmanship for a period of one (1) year from the date of shipment. If any
models or samples were shown to Buyer, such models or samples were
used merely to illustrate the general type and quality of the Products and
not to represent that the Products would necessarily conform to said
models or samples. Any Products found to be defective must be shipped to
KEYENCE with all shipping costs paid by Buyer or offered to KEYENCE
for inspection and examination. Upon examination by KEYENCE,
KEYENCE, at its sole option, will refund the purchase price of, or repair or
replace at no charge any Products found to be defective. This warranty
does not apply to any defects resulting from any action of Buyer, including
but not limited to improper installation, improper interfacing, improper
repair, unauthorized modification, misapplication and mishandling, such as
exposure to excessive current, heat, coldness, moisture, vibration or
outdoors air. Components which wear are not warranted.
(2) KEYENCE is pleased to offer suggestions on the use of its various
Products. They are only suggestions, and it is Buyer’s responsibility to
ascertain the fitness of the Products for Buyer’s intended use. KEYENCE
will not be responsible for any damages that may result from the use of the
Products.
(3) The Products and any samples ("Products/Samples") supplied to Buyer are
not to be used internally in humans, for human transportation, as safety
devices or fail-safe systems, unless their written specifications state
otherwise. Should any Products/Samples be used in such a manner or
misused in any way, KEYENCE assumes no responsibility, and additionally
Buyer will indemnify KEYENCE and hold KEYENCE harmless from any
liability or damage whatsoever arising out of any misuse of the Products/
Samples.
(4) OTHER THAN AS STATED HEREIN, THE PRODUCTS/SAMPLES ARE
PROVIDED WITH NO OTHER WARRANTIES WHATSOEVER. ALL
EXPRESS, IMPLIED, AND STATUTORY WARRANTIES, INCLUDING,
WITHOUT LIMITATION, THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT
OF PROPRIETARY RIGHTS, ARE EXPRESSLY DISCLAIMED.
IN NO EVENT SHALL KEYENCE AND ITS AFFILIATED ENTITIES BE
LIABLE TO ANY PERSON OR ENTITY FOR ANY DIRECT, INDIRECT,
INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES
(INCLUDING, WITHOUT LIMITATION, ANY DAMAGES RESULTING
FROM LOSS OF USE, BUSINESS INTERRUPTION, LOSS OF
INFORMATION, LOSS OR INACCURACY OF DATA, LOSS OF
PROFITS, LOSS OF SAVINGS, THE COST OF PROCUREMENT OF
SUBSTITUTED GOODS, SERVICES OR TECHNOLOGIES, OR FOR
ANY MATTER ARISING OUT OF OR IN CONNECTION WITH THE USE
OR INABILITY TO USE THE PRODUCTS, EVEN IF KEYENCE OR ONE
OF ITS AFFILIATED ENTITIES WAS ADVISED OF A POSSIBLE THIRD
PARTY’S CLAIM FOR DAMAGES OR ANY OTHER CLAIM AGAINST
BUYER. In some jurisdictions, some of the foregoing warranty disclaimers
or damage limitations may not apply.
BUYER’S TRANSFER OBLIGATIONS:
If the Products/Samples purchased by Buyer are to be resold or delivered
to a third party, Buyer must provide such third party with a copy of this
document, all specifications, manuals, catalogs, leaflets and written
information provided to Buyer pertaining to the Products/Samples.
E 1101-3
E GS (Lock) IM
Document Control No. 1477AAE201
10
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