ABB DSSR122 4899001-NK Digital Signal Relay Module

Product Brief Description

The ABB DSSR122 4899001-NK is a rack-mounted digital signal relay module for ABB S800 I/O and Advant OCS industrial control systems. This module provides isolated relay output channels to transmit control and trip signals between the controller and field equipment. Built with high-reliability relay contacts, optical isolation and comprehensive channel diagnostics, it ensures safe switching of external circuits in power plant, pulp & paper and heavy process control environments. Gold-plated backplane connectors guarantee stable long-term communication even under vibration and electromagnetic interference.

Product Functions

• Provide multiple isolated relay output channels for on/off control, alarm indication and safety interlock signal output
• Optical isolation between internal control logic and field relay circuits to suppress noise and prevent surge damage to the main controller
• Relay contact switching for driving external solenoids, alarm lamps, trip circuits and auxiliary contactors
• Built-in channel-level diagnostics for relay faults, coil failures and abnormal status feedback to the control system
• Communicate with the controller via the backplane bus to receive logic commands and upload module operating status
• Status LED indicators for power, channel activation and fault alerts to simplify on-site maintenance and troubleshooting

Application Scenarios

• Power plant boiler, turbine auxiliary control and safety interlock systems
• Pulp, paper and chemical process control using ABB Advant OCS / S800 I/O systems
• Oil & gas process plant alarm, shutdown and auxiliary equipment control cabinets
• Water treatment, waste incineration and industrial plant safety monitoring systems
• Retrofit and spare replacement projects for legacy ABB S800 I/O racks

Frequently Asked Questions