Digital I/O module

EthernetModbus RTUModbus TCP

Overview
Industrial I/O modules for building automation, industrial control and infrastructure applications. Available in 4MU, 8MU or 12MU sizes to fit a 45 mm switchboard cutout. These models provide relay-only outputs with selectable channel counts to match switching and control requirements.

Interfaces & Protocols

• RS485 interface with MODBUS/RTU Slave protocol
• Ethernet interface with MODBUS/TCP Server protocol (Ethernet versions also support MODBUS/RTU via Ethernet)
• Simple ASCII command protocol for media control and IoT integration (Node-RED, NodeJs, Python)

Power Supply
Wide-range DC input: 12–48 Vdc.

Available relay/output configurations

• 8x changeover relays (Form C) – ≤30 Vdc, ≤250 Vdc, ≤8 A
• 8x relays (Form A, normally open) – ≤30 Vdc, ≤250 Vdc, ≤6 A
• 12x relays (Form A) – ≤30 Vdc, ≤250 Vdc, ≤6 A
• 16x relays (Form A) – ≤30 Vdc, ≤250 Vdc, ≤6 A
• 24x relays (Form A) – ≤30 Vdc, ≤250 Vdc, ≤6 A
• 8x power relays (Form A) – ≤30 Vdc, ≤250 Vdc, ≤16 A, capacitive load handling up to 220 µF (special module for switching lighting)
• Solid State Relay variants (Form A): 250 Vac/dc ≤1 A; 60 Vac/dc ≤3 A; 60 Vac/dc ≤6 A; multiple channel counts available (e.g. 10x SSR, 20x SSR)

Relay technology & options
Mechanical relays use AgSnO2 contact material. Modules may share a common power supply. Contact forms include Form C (changeover) and Form A (normally open). Solid state relay (SSR) versions are offered in several current and voltage ratings for silent switching and high-cycle applications.

Configuration & Documentation
Supported by the RESIConfigurator software for parameterization and testing. Each unit is delivered with a complete ASCII command list and a MODBUS register table with detailed explanations to simplify integration and validation.

Technical specifications

• Product family: I/O modules with relay outputs (AC/DC)
• Module sizes: 4MU, 8MU or 12MU; fits 45 mm switchboard cutout
• Interfaces: RS485 (MODBUS/RTU Slave); Ethernet (MODBUS/TCP Server, MODBUS/RTU via Ethernet)
• Protocol support: MODBUS/TCP, MODBUS/RTU, ASCII command protocol
• Power supply: 12–48 Vdc
• Relay contact material: AgSnO2
• Relay forms: Form A (NO), Form C (changeover)
• Typical relay ratings: mechanical relays up to 8 A; power relays up to 16 A with capacitive load handling up to 220 µF
• SSR options: 250 Vac/dc ≤1 A; 60 Vac/dc ≤3 A; 60 Vac/dc ≤6 A
• Configuration tool: RESIConfigurator (software)