ABB

1.Main Functions

Discrete relay contact output driving: Receives digital logic commands from INFI‑90 back‑plane bus, and drives built‑in mechanical relay contacts to realize dry‑contact switching. It transfers DCS internal logic signals into field‑side on‑off control signals.More products: www.plcva.com
Full‑channel galvanic isolation: Achieves electrical isolation between DCS internal logic circuit and field‑load circuits via relay contact gaps. It blocks ground‑loop interference and suppresses surge voltage feedback from field equipment, protecting DCS main‑board circuits.
Multi‑channel contact switching: Provides independent relay dry‑contact channels for controlling external loads. Each contact supports switching of AC or DC field loads, without common‑power supply dependency between field‑side and DCS‑side.

RS 8911 Relay Discrete Output Module

Status indication feedback: Equipped with front‑panel LED status indicators. LED lights show pull‑in/release state of each relay channel for on‑site commissioning and fault diagnosis.
Interlock & sequence‑control signal conversion: Converts DCS internal interlock‑logic outputs into hard‑wired relay signals for external safety interlock circuits, emergency trips and sequential‑logic‑driven field devices.
Load‑side decoupling: Mechanical relay contacts isolate DCS electronic circuits from high‑voltage field loads, avoiding damage to sensitive DCS electronics caused by field‑side over‑voltage or short‑circuit faults.

RS 8911 Relay Discrete Output Module

Legacy INFI‑90 DCS cabinet deployment: Installed in standard INFI‑90 racks, serving as the discrete output interface between DCS controller and field switching‑type equipment.
Field‑device on‑off control: Used to drive solenoid valves, motor auxiliary relays, indicator lamps, alarm horns and local‑panel switching devices in process plants.
Safety interlock and trip logic: Provides hard‑wired relay signals for equipment interlocking, emergency shutdown, protection‑trip and alarm‑triggering loops in thermal power, chemical and metallurgical plants.More products: www.plcva.com

RS 8911 Relay Discrete Output Module

Cross‑system signal hard‑wired interconnection: Realizes dry‑contact signal hand‑shaking between INFI‑90 DCS and external PLCs, safety systems or local control panels.
Plant maintenance, spare‑part replacement and retrofitting: Serves as critical spare replacement component for aging INFI‑90 control racks, used for equipment overhaul, field repair and legacy‑system modernization projects.
Sequence‑of‑event and batch‑process control: Executes sequential‑logic output commands for batch‑production and automatic‑start‑stop sequences in process industries.