Description

RDIOR420 Remote Digital I/O Relay Module

Technical Specifications

• Product Model: RDIOR420
• Brand: Alstom
• Warranty: One Year
• I/O Configuration: 4-channel digital inputs, 2-channel relay outputs
• Input Rating: 24 VDC sink/source discrete inputs
• Output Contact Rating: 250 VAC / 30 VDC, 5 A resistive load per contact
• Isolation: Galvanic isolation between field side and logic side
• Operating Temperature: -20 °C ~ +60 °C
• Storage Temperature: -40 °C ~ +85 °C
• Protection Class: IP20 DIN-rail / rack-mount module
• Communication: RS-485 fieldbus interface for remote I/O network
• System Compatibility: Alstom industrial control and SCADA systems
• Diagnostics: Per-channel status LEDs, communication fault indication
• Humidity: 5-95 % RH non-condensing
• Weight: 0.35 kg
• Dimensions: Compact DIN-rail mount I/O module footprint
• 

Product Overview

RDIOR420 is a remote digital I/O relay module for Alstom industrial control systems. It collects field discrete status signals and drives relay output loads such as solenoid valves, contactors and indicator lamps, communicating with host controller via RS-485 fieldbus. Relay contact output supports direct connection to low-power field actuators without intermediate relays. Widely used in power plant auxiliary systems and industrial process control cabinets. Surplus and refurbished tested spare I/O module for control system maintenance projects.

Application Notes

• Do not exceed contact current rating for inductive loads; add surge suppression if necessary.
• Set correct station address and baud rate for fieldbus communication.
• Typical deployment: Remote digital relay I/O module spare-part stocking.