KEYENCE Safety Interlocking Switch GS-M Instructions Manual

Symbols

• DANGER: Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
• CAUTION: Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• Important: Indicates cautions and limitations that must be followed during operation.

Safety Precautions

DANGER

• KEYENCE does not guarantee the function or performance of the GS-M if it is used in a manner that differs from the GS-M specifications or if the GS-M is modified.
• The GS-M can only be used in combination with dedicated actuators listed in this manual.
• Do not use a replacement actuator to bypass the GS-M. Store replacement actuators strictly to prevent their easy access.
• When using the GS-M for machine safety, always follow applicable laws, rules, regulations, and standards in the country or region of use. Contact the responsible regulatory agency for guidance.
• Responsible personnel must train assigned personnel for correct use, installation, maintenance, and operation.
• The user of the machine must receive specialized training related to the GS-M and understand and adhere to safety restrictions, laws, and regulations.
• The GS-M is designed for correct installation and operation as described in this manual. Perform an appropriate installation after a sufficient risk assessment.
• Machine builders must consider the machine's stopping time with inertia.
• Do not use devices emitting strong electromagnetic waves near the GS-M.
• This product is not intended for use as an explosion-proof product. Do not use in hazardous or potentially explosive atmospheres.
• Do not use the GS-M in the presence of substances like heavy smoke, particulate matter, or corrosive chemical agents that may induce product deterioration.
• Be sure to absolutely confirm that there is nobody in the hazardous zone before the interlock is released (machine system restarts).
• Indoor use only.
• It must be possible to perform an emergency stop on the machine at any operation point. Do not use the GS-M on machines with irregular stop times.
• Do not use the GS-M to control transportation vehicles, aircraft, space equipment, medical devices, or nuclear power generation systems.
• Be sure to turn the power supply OFF before performing electrical wiring.
• Perform electrical wiring according to applicable electrical standards, regulations, and laws.
• Use cables with length less than or equal to the specification in this manual. Usage of longer cables may cause improper operation of safety functions.
• When disposing of the GS-M, always follow applicable requirements of laws, rules, regulations, and standards.

Important

• Dispose of this product as industrial waste.

Precautions on Regulations and Standards

CE Marking

KEYENCE Corporation confirms that this product complies with the essential requirements of applicable EU Directive(s). Use a power supply that complies with SELV or PELV. The full text of the EU declaration of conformity is available at: http://www.keyence.com/ce. These specifications do not guarantee end-product compliance; the end-product manufacturer is responsible for compliance.

UL Certificate

The GS-M is a UL/c-UL certified product (UL File No.: E301717, Category: NRKH/NRKH7, Enclosure Type 1). Use a power supply with Class 2 output defined in NFPA70 (NEC). Connect the power supply, external input, and control output to a single Class 2 power supply.

North American Regulations

The GS-M complies with FCC Part15 Subpart B (Class A), FCC Part15 Subpart C, ICES-003 (Class A), and RSS-210. Operation is subject to two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received. FCC CAUTION: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Chapter 1 Before Operation

1-1 Overview

The GS-M is a Type 4 Interlocking Device based on ISO14119. It supports both low-level coded and high-level coded actuators. By combining the GS-M with a movable safety guard and a safety-related control system, hazardous machine operations can be stopped if the guard opens during operation.

Part descriptions

Main unit: Includes indicator, M12 connector, magnet center.

Actuator: Includes magnet center, indicator.

DANGER: Do not use the lock function with a safety-related control system.

1-2 Product List

Main unit

Models include GS-M5 (PNP/NPN, Terminal/M12 connector, Holding force 500N/900N, suitable for sliding door), GS-M9, and GS-ML5.

Actuator

Chapter 2 Installation

2-1 Installation Conditions

CAUTION

• The sensor's operating distance may be affected by surrounding metal. Determine the minimum safety distance after installation.
• Refer to ISO 14119 for requirements and precautions to minimize defeat possibilities.

Important

• Install the GS-M where the main unit cannot be accessed or onto a metal frame with heat dissipation capacity to prevent burn injury from accidental contact.
• Install the actuator and main unit to ensure close contact between magnet centers for optimal holding force.

Alignment tolerance

Typical Installation: Align alignment marks and magnet centers (GS-M5/GS-M9) or detection centers and magnet centers (GS-ML5). Refer to Chapter 6 for dimensions.

• GS-M5/GS-M9: Tolerance: A, B, C within 0-10 mm, Tilt within 4 degrees. Holding force: GS-M5: 500 N, GS-M9: 900 N.
• GS-ML5: Tolerance: Misalignment between detection centers within 5 mm, magnet centers within 5 mm. Tilt within 4 degrees.

Actuator teaching (high coded actuator): After power ON, the main unit memorizes the first detected actuator for 3 seconds or more. The indicator blinks green upon completion. Only memorized actuators can be detected after restarting.

Chapter 3 Wiring

3-1 Terminal and Pin Assignment

Terminal type (GS-M50): Pin assignment for +24V, Safety input 1, Safety input 2, Lock control input, 0V, OSSD1, OSSD2, AUX output. Use a cable gland tested according to IEC 60529 (IP65/67) and IEC 62444 for IP65/67 rating and cable anchoring. Maximum cable length: 31 m. Cable size: AWG 26 to 16.

Standard type (GS-M51/ GS-M91/ GS-ML51): Pin assignment for AUX output, +24V DC, Lock control input, Safety input 2, OSSD1, OSSD2, 0V, Safety input 1. Wire colors are specified for each pin.

Advanced function type (GS-M53/ GS-M93/ GS-ML53): Pin assignment for +24V DC, Safety input 1, 0V, OSSD1, AUX output1, Safety input 2, OSSD2, EDM selection input, AUX output 2, Lock control input, Reset/EDM input, OSSD operation switching input. Wire colors are specified for each pin.

3-2 Wiring Example

Wiring examples are provided for GS-M50N (NPN), GS-M50P (PNP), GS-M51P/91P/L51P (PNP) with and without cascading, and GS-M53P/93P/L53P (PNP) with OSSD operation set to Lock link.

DANGER

• If only one OSSD output is used, an OSSD malfunction can prevent the machine from stopping.
• Perform wiring to meet IEC 60204-1 requirements to prevent malfunctions caused by ground faults on OSSD output wires.
• Use an emergency stop switch/button with two or more independent, NC contacts. Refer to IEC 60204-1, ISO 13850, and other relevant regulations for emergency stop requirements.
• Ensure the device does not start or restart automatically when the emergency stop switch/button is reset.
• When using a PNP sensor, connect the OSSDs of the PNP type GS-M or GS to the safety inputs.
• When using a NPN sensor, connect the OSSDs of the NPN type GS-M or GS to the safety inputs.
• Confirm nobody is in the hazardous zone before releasing the interlock condition.
• Install the interlock release switch in a position where the entire hazardous zone can be checked and cannot be operated from within the hazardous zone.
• When the interlock function is set to Automatic, ensure the safety of the entire control system to prevent unexpected starts.
• Prevent the reset/EDM input from short-circuiting with other inputs or outputs.
• AUX outputs cannot be used as safety outputs.

Chapter 4 Functions

Functions vary by main unit model (simple, standard, advanced).

*1 When OSSD operation is set to "Open/close link", AUX cannot be used.

4-1 OSSD

OSSDs are safety outputs for machine control systems. OSSD 1/2 are redundant safety outputs. The GS-M performs self-diagnosis on its control circuit. If the internal control circuit does not receive a feedback signal (OFF-signal) based on self-diagnosis, the GS-M enters an error state.

OSSD operation

• Lock link: Actuator and main unit aligned and in contact, Lock control input ON, Safety inputs ON.
• Open/close link: Actuator and main unit aligned and in contact, Safety inputs ON.

4-2 Safety Input

This function controls OSSDs using input signals from sensors or emergency stop switches. Safety input 1 and 2 form a pair; if either goes OFF, OSSDs go OFF. Multiple GS-M units can be cascaded.

4-3 Interlock Function

Prevents OSSDs from automatically going ON from OFF, preventing unintended machine start-up or restart. Reset operation is required. Advanced function type offers Automatic (OSSDs switch ON when conditions met) and Manual (OSSDs remain OFF until reset) settings.

4-4 EDM Function

Monitors external devices (e.g., force guided relay, magnetic contactor) connected to OSSDs to detect failures, enabling start/stop control.

4-5 Lock Function

Uses electromagnetic power to keep the guard closed where the GS-M actuator is installed.

4-6 AUX Output

Informational output for checking GS-M operating status. Operation varies by main unit type. AUX outputs turn ON if an error occurs.

Chapter 5 Specifications

5-1 Specifications

*1 Due to the flexible structure of the actuator, the guard can open 3.8 mm larger than the "Sar".

*2 Risk time according to IEC60947-5-3 is 150 ms + 2 ms x (number of cascaded units - 1).

*3 When stored for a long period of time, please store it at temperature of 55°C or lower.

Chapter 6 Appendix

6-1 Dimensions

Dimensional drawings are provided for GS-M5 (Main unit Terminal and M12 Connector, Actuator), GS-M9 (Main unit, Actuator), and GS-ML5 (Main unit, Actuator).

6-2 Indicator Descriptions

Descriptions of indicator lights for Lock link mode (OSSD Operation) and Lock control input are provided, including states like Green ON, Red OFF, Blinking green, etc.

6-3 Inspection and Maintenance

DANGER

• Ensure no one is present in the hazardous zone during inspection.
• If any error is found, do not operate the machine.

Initial inspection: Verify correct installation, wiring, and operation of safety functions.

Periodic inspection: Inspect safety functions monthly or yearly based on SIL/PL ratings and usage frequency, following ISO 14119. Store inspection results. Errors cannot be repaired by the customer; replace the product or contact KEYENCE.

6-4 Cleaning

Clean the product if metal powder or similar substances are in contact with the faces of the main unit and actuator.

WARRANTIES AND DISCLAIMERS

KEYENCE warrants Products to be free of defects in materials and workmanship for one (1) year from shipment. This warranty does not apply to defects resulting from improper installation, interfacing, repair, modification, misapplication, or mishandling. KEYENCE will refund, repair, or replace defective Products at its sole option. Suggestions on product use are only suggestions; Buyer is responsible for ascertaining fitness for intended use. KEYENCE is not responsible for damages resulting from product use. Products are not to be used internally in humans, for human transportation, as safety devices, or fail-safe systems unless specified otherwise. Buyer will indemnify KEYENCE for any liability or damage arising out of misuse. ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY DISCLAIMED. KEYENCE and its affiliates are not liable for any direct, indirect, incidental, punitive, special, or consequential damages arising from the use or inability to use the Products.

BUYER'S TRANSFER OBLIGATIONS: If Products are resold or delivered to a third party, Buyer must provide such third party with a copy of this document and all related specifications and information.