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IO-Link Master Unit

GD Series

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last update: March 9, 2026

IO-Link Master Unit

GD-ILM16C-MLP/GD-ILM16E-MLP

General specifications

Item GD-ILM16C-MLP GD-ILM16E-MLP
Number of ports 16
Power supply voltage 24 VDC ±15% (SELV and LIM power supplies, or UL 1310 Class 2 power supplies)
Current consumption (Only Master Unit) 195 mA or less
Maximum current of the port 0.2 A or less per 1 port, 2.5 A or less per 16 port
Maximum power current 8 A (Total of unit power supply and I/O power supply)
Insulation resistance 20 MΩ or more (between external power supply and unit power supply at 500 VDC)
Connectors Field network 2×RJ45 Socket
Power supply Spring-clamp terminal block, 5-pole, 2-row
Input/output 3×16-channel spring-clamp terminal blocks 16×e-CON sockets, 4 poles
Indicators POWER LED (blue green), EVENT LED (yellow), ALARM LED (red), I/O LED (orange)
Display OLED (Display language: English, Japanese, Simplified Chinese, Traditional
Chinese, Korean, French, Spanish, German, Portuguese, Italian)
Field network • EtherNet/IP
• Ethernet & Modbus/TCP
• CC-Link IE Field Basic
(Switch in settings)
I/O assignment Switchable in the following 6 modes by setting for each port:
• Unused (default)
• IO-Link communication mode
• SIO (PNP input) mode
• SIO (NPN input) mode
• SIO (PNP output) mode
• SIO (NPN output) mode
IO-Link
Communication
Specifications		 IO-Link revision 1.1
Communication
speed		 COM1 (4,800 bps)/COM2 (38,400 bps)/COM3 (230.4 kbps)
Physical layer IO-Link-compliant
Minimum cycle time 0.3 ms
Data Periodic: Process data, Status Aperiodic: Devices data, Event
Input
Specifications		 Rated input voltage 24 VDC ±20% (SELV and LIM power supplies, or UL 1310 Class 2 power supplies) *1
Voltage and current
at ON		 PNP: 15 VDC or more, 5.5 mA or more
NPN: Power supply voltage -13 VDC or less, 3.0 mA or more
Voltage and current
at OFF		 PNP: 10 VDC or less, 2.0 mA or less
NPN: Power supply voltage -8 VDC or more, 2.0 mA or less
Input resistance PNP: 5.5 mA rated current circuit load, NPN: 4.7 kΩ
Input filter time 0 ms (default), 0.1 ms, 1 ms, 5 ms, 10 ms, 20 ms
Output
Specifications		 Rated load voltage 10.8 to 26.4 VDC (SELV and LIM power supplies, or UL 1310 Class 2 power supplies) *1
Maximum output
load current		 0.2 A per 1 port, 2.5 A per 16 port
Overcurrent
protection current		 Current limiting (0.5 A) by Overcurrent protection function
OFF output leakage
current		 PNP: 0.1 mA or less NPN: 0.2 mA or less
Residual Voltage PNP: 1.8 V or less, NPN: 1.6 V or less
Output response
time		 0.1 ms or less
Environmental
resistance		 Operating/
Storage temperature		 Operating: 0 to 55°C
Storage: -25 to +75°C
(no freezing or condensation)
Operating/
Storage humidity		 Operating/Storage: 5 to 95% RH (no condensation)
Vibration resistance IEC 61131-2 compliant
Vibration frequency: 5 to 8.4 Hz, single amplitude: 3.5 mm
Vibration frequency: 8.4 to 150 Hz, acceleration: 10 m/s2 (1.0 G)
Number of sweeps: 10 times each in 3 directions along X, Y, and Z axes
Shock resistance IEC 61131-2 compliant
Peak acceleration: 150 m/s2 (15 G), 3 times each in 3 directions along X, Y, and Z axes (total of 18 times)
Operating
environment		 No corrosive gas
Operating altitude 0 to 2,000 m
Installation location In door use
Degree of
protection		 IP20
Overvoltage category ǁ or less
Pollution degree 2 or less
Equipment class Class ǀ
Material Case: PC, keys/DIN rail mounting hook: POM, terminal block: PA
Weight Approx. 195 g (including terminal blocks, when not wired)
Included accessories Instruction manual, compliance sheet, power terminal block, 2×RJ45 connector protective cap (attached to unit)
3×device terminal block ---

*1. Use a Class 2 power supply or a power supply compliant with SELV (Safety Extra-Low Voltage) circuit and LIM (Limited Energy Circuit) circuit standards.

Field network communication specifications

EtherNet/IP Communication Specifications

Item GD-ILM16[]-MLP
Host Network Communication Protocol EtherNet/IP
Applicable version EtherNet/IP adapter
Authentication version CT21
Conforming standard IEEE802.3u
Transmission speed 10 Mbps (10BASE-T), 100 Mbps (100BASE-TX)
Cable Twisted pair cable (STP)
Category 5/5e or higher
Ethernet Connection Type Star configuration, linear bus configuration, device level ring configuration
Distance between nodes Within 100 m
IP address configuration Static IP address only
Cyclic Communication (Implicit Message) Class 1 service
Acyclic Communication (Explicit Message) • Class 3 message
• UCMM
Support objects • Identity object
• Message Router object
• Assembly object
• Connection Manager object
• DLR object
• QoS object
• TCP/IP Interface object
• Ethernet Link object
• This unit's object
• IO-Link device object connected to this unit
Reset service • Type0
• Type1
Maximum no. of connections Class 1: 5, Class 3: 8, UCMM: 8
Packet interval (RPI) 1 to 3,200 ms
Unit Allowable Communications Band Width 1,000 pps
EtherNet/IP Product Internal Response Time 0.6 ms or less
Extended access function This function uses cyclic communication to read and write settings for
this product and IO-Link devices. Host master side programs can be
simplified.
Other functions • ACD (Address Conflict Detection)
• DLR (Device Level Ring)
• Auto Negotiation
• Auto MDIX
• Quick Connect

Ethernet & Modbus/TCP Communication Specifications

Item GD-ILM16[]-MLP
Host network communication protocol Modbus TCP/UDP communication or Ethernet socket communication
Conforming standard IEEE802.3u
Transmission speed 10 Mbps (10BASE-T), 100 Mbps (100BASE-TX)
Cable Twisted pair cable (STP) Category 5, 5e and above
Ethernet connection type Star configuration, linear bus configuration
Modbus
communication		 Master (client)/Server Operates as a Modbus server
Transport layer protocol TCP or UDP
Port number 502 (common to TCP/IP and UDP/IP)
Corresponding function code 3, 6, 16, 23
Register number 400001 to 465536
Distance between nodes Within 100 m
IP address setting Static IP address only
Number of connectable units Number of units that can be connected from one Modbus/TCP master:
It depends on the specifications of the Modbus/TCP master
Number of simultaneous
connections		 Modbus/TCP: 2
Modbus/UDP: 4
Socket
communication		 Transport layer protocol TCP or UDP
Port number 2001 (common to TCP/IP and UDP/IP)
IP address setting Static IP address only
Number of simultaneous
connections		 TCP/IP: 2
UDP/IP: 4

CC-Link IE Field Basic Communication Specifications

Item GD-ILM16[]-MLP
Host network communication protocol CC-Link IE Field Basic communication, socket communication (UDP/IP, TCP/IP), or Modbus/TCP
Conforming standard IEEE802.3u
Transmission speed 100 Mbps (100BASE-TX)
Cable Twisted pair cable (STP) Category 5, 5e or higher
Ethernet connection type Star configuration, linear bus configuration
Cyclic
communication		 Method CC-Link IE Field Basic cyclic transmission
By station type Slave station
Number of occupied stations 1 station
Distance between nodes Within 100 m
IP address setting Static IP address
Product standard response time 0.6 ms
Extended access function This function uses cyclic communication to read and write settings for
this product and IO-Link devices. Host master side programs can be
simplified.
Port number • Cyclic data transmission: 61450 (UDP)
• Node connection: 61451 (UDP)
Acyclic
communication		 Method Socket communication (UDP/IP or TCP/IP) or Modbus/
TCP communication
Access target Both socket communication and Modbus/TCP:
Reading and writing of setting values is possible, as well as reading of process data
(writing to process data is not applicable).
Note: Socket communication setting values background access mode is possible.
Number of simultaneous
connections		 • Socket communication (UDP/IP: 4, TCP/IP: 1)
• Modbus/TCP communication: 2
IP address setting Static IP address
Port number • Socket communication: 2001 (both TCP and UDP)
• Modbus/TCP communication: 502

GD-ILM16C-CLI/GD-ILM16E-CLI

General specifications

Item GD-ILM16C-CLI GD-ILM16E-CLI
Number of ports 16
Power supply voltage 24 VDC ±15% (SELV and LIM power supplies, or UL 1310 Class 2 power supplies)
Current consumption (Only Master Unit) 220 mA or less
Maximum current of the port 0.2 A or less per 1 port, 2.5 A or less per 16 port
Maximum power current 8 A (Total of unit power supply and I/O power supply)
Insulation resistance 20 MΩ or more (between external power supply and unit power supply at 500 VDC)
Connectors Field network 2×RJ45 Socket
Power supply Spring-clamp terminal block, 5-pole, 2-row
Input/output 3×16-channel spring-clamp terminal blocks 16×e-CON sockets, 4 poles
Indicators POWER LED (blue green), EVENT LED (yellow), ALARM LED (red), I/O LED (orange)
Display OLED (Display language: English, Japanese, Simplified Chinese, Traditional Chinese, Korean, French, Spanish, German, Portuguese, Italian)
Field network • CC-Link IE Field
• CC-Link IE TSN
(Switch in settings)
I/O assignment Switchable in the following 6 modes by setting for each port:
• Unused (default)
• IO-Link communication mode
• SIO (PNP input) mode
• SIO (NPN input) mode
• SIO (PNP output) mode
• SIO (NPN output) mode
IO-Link
Communication
Specifications		 IO-Link revision 1.1
Communication speed COM1 (4,800 bps)/COM2 (38,400 bps)/COM3 (230.4 kbps)
Physical layer IO-Link-compliant
Minimum cycle time 0.3 ms
Data Periodic: Process data, Status
Aperiodic: Devices data, Event
Input
Specifications		 Rated input voltage 24 VDC ±20% (SELV and LIM power supplies, or UL 1310 Class 2 power supplies) *1
Voltage and current at ON PNP: 15 VDC or more, 5.5 mA or more
NPN: Power supply voltage -13 VDC or less, 3.0 mA or more
Voltage and current at OFF PNP: 10 VDC or less, 2.0 mA or less
NPN: Power supply voltage -8 VDC or more, 2.0 mA or less
Input resistance PNP: 5.5 mA rated current circuit load, NPN: 4.7 kΩ
Input filter time 0 ms (default), 0.1 ms, 1 ms, 5 ms, 10 ms, 20 ms
Output
Specifications		 Rated load voltage 10.8 to 26.4 VDC (SELV and LIM power supplies, or UL 1310 Class 2 power supplies) *1
Maximum output load
current		 0.2 A per 1 port, 2.5 A per 16 port
Overcurrent protection
current		 Current limiting (0.5 A) by Overcurrent protection function
OFF output leakage
current		 PNP: 0.1 mA or less NPN: 0.2 mA or less
Residual Voltage PNP: 1.8 V or less, NPN: 1.6 V or less
Output response time 0.1 ms or less
Environmental resistance Operating/
Storage temperature		 Operating: 0 to 55°C
Storage: -25 to +75°C
(no freezing or condensation)
Operating/
Storage humidity		 Operating/Storage: 5 to 95% RH
(no condensation)
Vibration resistance IEC 61131-2 compliant
Vibration frequency: 5 to 8.4 Hz, single amplitude: 3.5 mm
Vibration frequency: 8.4 to 150 Hz, acceleration: 10 m/s2 (1.0 G)
Number of sweeps: 10 times each in 3 directions along X, Y, and Z axes
Shock resistance IEC 61131-2 compliant
Peak acceleration: 150 m/s2 (15 G), 3 times each in 3 directions along X, Y, and Z axes (total of 18 times)
Operating environment No corrosive gas
Operating altitude 0 to 2,000 m
Installation location In door use
Degree of protection IP20
Overvoltage category ǁ or less
Pollution degree 2 or less
Equipment class Class ǀ
Material Case: PC, keys/DIN rail mounting hook: POM, terminal block: PA
Weight Approx. 195 g (including terminal blocks, when not wired)
Included accessories Instruction manual, compliance sheet, power terminal block, 2×RJ45 connector protective cap (attached to unit)
3×device terminal block ---

*1. Use a Class 2 power supply or a power supply compliant with SELV (Safety Extra-Low Voltage) circuit and LIM (Limited Energy Circuit) circuit standards.

Field network communication specifications

CC-Link IE Field Communication Specifications

Item GD-ILM16[]-CLI
Host network communication protocol CC-Link IE Field
Station type Remote device station or Intelligent devices station
Transmission speed 1 Gbps
Total cable extension Between Field Network master station and this product: 100 m
Between this product (IO-Link master) and IO-Link devices: 20 m
Station number setting 1 to 120
Internal response time 0.6 ms or less

CC-Link IE TSN Communication Specifications

Item GD-ILM16[]-CLI
Host network communication protocol CC-Link IE TSN
Station type Remote station
Transmission speed 1 Gbps or 100 Mbps *1
Total cable extension Between Field Network master station and this product: 100 m
Between this product (IO-Link master) and IO-Link devices: 20 m
Station number setting 1 to 254
Internal response time 0.6 ms or less
Authentication Class Class B or Class A (Switchable)

*1. It is specified in the master setting value “M83.IE TSN Class Setting”. Additionally, 100 Mbps is supported only for Class A.

last update: March 9, 2026

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