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SeaI/O-420M is a Modbus RTU-compatible I/O module that offers 16 optically isolated inputs and 8 high-reliability Form C relays. Ideal for industrial automation and remote control applications using RS-485 communication..
The SeaI/O-420M allows reliable control and monitoring in automation environments. With 16 optically isolated digital inputs and 8 SPDT Form C relays, it supports both sensing and switching applications. Inputs and outputs are grouped in four-bit segments with a shared common, simplifying wiring through removable terminal blocks.
This device communicates over RS-485 using the Modbus RTU protocol or can be integrated through the Sealevel SeaMAX API. It supports seamless integration in both Windows and Linux environments. The SeaI/O-420M is enclosed for durability and is powered via 9–30VDC input, suitable for varied industrial setups.
For system scalability, up to 246 additional I/O modules can be added using SeaI/O’s pass-through connectors. The device is ideal for factory automation, SCADA systems, and any Modbus-based application requiring both input sensing and relay control.
16 optically isolated inputs (5–30VDC range)
8 Form C (SPDT) relay outputs (60VDC @ 2A)
RS-485 Modbus RTU communication
SeaMAX API support for Windows & Linux
Removable 3.5mm terminal blocks for easy wiring
Wide power input range (9–30VDC)
Expandable up to 246 SeaI/O modules
Durable enclosure for rugged environments
Communication Interface: RS-485 (Modbus RTU)
Inputs: 16 optically isolated inputs (5–30VDC)
Outputs: 8 Form C (SPDT) relays, 60VDC @ 2A
Power Requirement: 9–30 VDC @ 2.0W
Operating Temperature: 0°C to 70°C
Storage Temperature: -50°C to 105°C
Humidity Range: 10–90% RH (non-condensing)
Dimensions: 7.5” L x 5.1” W x 1.3” H
Mounting: Enclosed design
Software Support: SeaMAX API (Windows & Linux)