Y301-110 pairs one opto-isolated input with one normally-open relay for local alarms and actuator control, using RS485 Modbus RTU and two onboard automation rules.
Y301-110/200/020 Compact Digital I/O Modules
Compare compact Y301 modules with 1 DI + 1 normally-open relay, 2 DI or 2 normally-open relay outputs for Modbus RTU control.

Key Features
Y301-200 reads two opto-isolated digital inputs over RS485 Modbus RTU, with 32-bit pulse counting, configurable debounce, and count retention after power loss.
Y301-020 controls two normally-open relays over RS485 Modbus RTU, with 125 VAC 0.5 A or 30 VDC 2 A contacts and four local rules for timed switching.
Specifications
Y301-110
- Power Supply
- Voltage: DC 5~36V; Typical Current: 80 mA @ 12 V; Operating Temperature: -40°C ~ +85°C; Humidity: 5% ~ 95% RH, non-condensing
- Digital Inputs
- Channels: 1; Type: Dry/wet contact, opto-isolated; Voltage Range: 5-36 VDC (wet contact; confirm permitted voltage for supplied hardware before connection); Sampling Rate: 100 Hz; Pulse Counter: 32-bit, selectable rising/falling edge; Debounce: 5~255 ms (default 50 ms)
- Digital Outputs
- Channels: 1; Type: normally-open relay; Contact Rating: 125 VAC 0.5 A / 30 VDC 2 A; Electrical Life: 100,000 cycles; Output Retention: Not supported
- Communication
- Interfaces: RS485 (2-wire), optional RS232 or TTL; Protocol: Modbus RTU slave; Baud Rate: 600~230400 bps (default 9600); Slave Address: 1-255 (software configurable; default 1)
- Mechanical
- Dimensions: 77.4 x 22.5 x 16.2 mm; Mounting: DIN rail or screw mounting
Y301-200
- Power Supply
- Voltage: DC 5~36V; Typical Current: 80 mA @ 12 V; Operating Temperature: -40°C ~ +85°C; Humidity: 5% ~ 95% RH, non-condensing
- Digital Inputs
- Channels: 2; Type: Dry/wet contact, opto-isolated; Voltage Range: 5-36 VDC (wet contact; confirm permitted voltage for supplied hardware before connection); Sampling Rate: 100 Hz; Pulse Counter: 32-bit, selectable rising/falling edge; Debounce: 5~255 ms (default 50 ms); Counter Retention: Accumulated counts are retained after power loss
- Communication
- Interfaces: RS485 (2-wire), optional RS232 or TTL; Protocol: Modbus RTU slave; Baud Rate: 600~230400 bps (default 9600); Slave Address: 1-255 (software configurable; default 1)
- Mechanical
- Dimensions: 77.4 x 22.5 x 16.2 mm; Mounting: DIN rail or screw mounting
Y301-020
- Power Supply
- Voltage: DC 5~36V; Typical Current: 80 mA @ 12 V; Operating Temperature: -40°C ~ +85°C; Humidity: 5% ~ 95% RH, non-condensing
- Digital Outputs
- Channels: 2; Type: normally-open relay; Contact Rating: 125 VAC 0.5 A / 30 VDC 2 A; Electrical Life: 100,000 cycles; Output Retention: Not supported
- Communication
- Interfaces: RS485 (2-wire), optional RS232 or TTL; Protocol: Modbus RTU slave; Baud Rate: 600~230400 bps (default 9600); Slave Address: 1-255 (software configurable; default 1)
- Mechanical
- Dimensions: 77.4 x 22.5 x 16.2 mm; Mounting: DIN rail or screw mounting
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