Name: ICS TRIPLEX T8403 TMR Digital Input Module - MASSIVE
Brand: Allen-Bradley

Description

ICS TRIPLEX T8403 TMR Digital Input Module

Product Overview

T8403 is a 40‑channel high‑density TMR digital input module for Rockwell ICS TRIPLEX Trusted SIS safety‑instrumented system. Variant T8403C is conformal‑coated for corrosive cabinet environments. Every single channel adopts triple‑modular‑redundant 2‑out‑of‑3 hardware voting for 24 VDC discrete signals from dry‑contact switches, relay contacts and field sensors. It supports per‑channel line‑fault supervision, 1 ms resolution on‑board SOE timestamp recording and hot‑swap online replacement. TÜV certified SIL 3 compliant to IEC 61508. Legacy safety hardware; OEM production discontinued, mainly supplied as spare‑parts for oil‑gas, chemical and power‑plant SIS installations.

Typical Applications

Oil‑gas & petrochemical SIS: Digital signal acquisition for ESD emergency shutdown and F&G fire‑gas safety systems; trip‑switch, valve‑position, interlock‑contact status collection
Chemical plant safety interlock: High‑density discrete‑point input for large‑scale safety‑instrumented loops
Power‑plant safety system: Safety‑related binary‑signal monitoring for boiler and turbine protection interlocks
Off‑shore platform safety cabinet: Field‑signal acquisition under high‑humidity and salt‑spray ambient conditions (T8403C coated version preferred)
Brown‑field retrofit & spare‑part replacement: Renewal of digital‑input hardware for existing Trusted main / expander chassis

T8403

Specifications & Technical Parameters

Item	Specification
Model	T8403; Conformal‑coated variant: T8403C
System Compatibility	ICS TRIPLEX Trusted TMR SIS platform
Channel Count	40 TMR digital input channels
Input Type	24 VDC dry‑contact / NPN‑PNP active input;‑6 V ~ +36 V measurement range
Input Impedance	5 kΩ; typical 2 mA per‑channel input current
SOE Timestamp Resolution	1 ms, on‑board time‑stamping
Galvanic Isolation	2500 V impulse‑withstand isolation barrier
Power Supply	20‑32 VDC; total power consumption approx 18 W
Safety Certification	TÜV SIL 3 (IEC 61508)
Hot‑swap Support	Yes, online replacement without SIS shutdown
Line Diagnostics	Per‑channel configurable open‑circuit / short‑circuit detection
Operating Temperature	0 ℃ ~ +60 ℃
Storage Temperature	‑25 ℃ ~ +85 ℃
Humidity	5 %‑95 % RH, non‑condensing
Indicators	Front‑panel LED for slice health, channel status and fault diagnostics
Mounting	Single‑slot plug‑in for Trusted main / expander chassis
Weight	Approx. 1.1 kg
Certifications	CE, UL compliant
Protection Class	IP20 (cabinet‑mount only)

Key Features & Benefits

Per‑channel TMR hardware voting: Each field input is triplicated into three independent measuring circuits, executes 2‑out‑of‑3 voting. Single‑circuit fault will not affect channel function, eliminates single‑point‑failure risk for safety‑related discrete loops.
Universal 24 VDC discrete‑input support: Compatible with dry‑contact relays, limit switches and active‑type field sensors, widely used for safety‑interlock status acquisition.
Per‑channel wiring supervision: Independently detects open‑circuit and short‑circuit faults on field wiring, reports diagnostic alarms without interfering safety‑logic execution.
On‑board high‑precision SOE: 1 ms local timestamp for every channel state change, avoids central‑processor timestamp jitter, supports accurate post‑trip fault analysis.
Hot‑swap maintainability: Supports online module replacement while SIS keeps running, reduces plant downtime during overhaul and maintenance work.
High‑voltage galvanic isolation: 2500 V isolation barrier protects internal safety electronics from field‑side surge and EMI interference.
Conformal‑coated option (T8403C): Enhanced moisture‑resistance and anti‑corrosion performance for offshore, coastal and corrosive cabinet environments.
Seamless Trusted‑platform integration: Works together with Trusted processor, expander modules and FTA field termination assemblies.