ICS Triplex T8850
ICS Triplex T8850
ICS Triplex T8850
ICS Triplex T8850
ICS Triplex T8850

ICS Triplex T8800 | SIL 3 Certified Digital Input Module for SIS

  • Brand: ICS Triplex (Part of Honeywell)
  • Model: T8800C (Digital Input FTA Module)
  • Product Type: Safety-Critical Digital Input Module
  • Series: Trusted™ Triple Modular Redundant (TMR) Safety Platform
  • Core Function: Provides 16-channel digital input monitoring for safety instrumented systems (SIS), with triple redundancy and SIL 3 certification.
  • Key Specs: 16 digital inputs (24VDC), Modbus RTU communication, -20°C to +70°C operating temperature, 3-level redundancy, <20ms fault detection.
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Description

T8800C: Product Overview
The ICS Triplex T8800C is a high-reliability digital input module designed for safety-critical industrial processes​ (e.g., oil & gas, chemical, power generation). As part of Honeywell’s Trusted™ TMR safety platform, it delivers fault-tolerant monitoring of digital signals (e.g., emergency stops, valve statuses) with triple redundancy to ensure uninterrupted operation in harsh environments. The module converts field device signals (24VDC) into standardized digital inputs for SIS controllers, enabling real-time safety interlocks and compliance with IEC 61508 SIL 3 standards.
A key feature is its triple modular redundancy (TMR)​ design: three independent input channels process signals in parallel, with a voter circuit rejecting faulty data. This eliminates single-point failures and ensures the module continues operating safely even if one channel malfunctions. The T8800C also includes built-in diagnostics (e.g., signal integrity checks, channel monitoring) and supports Modbus RTU for seamless integration with PLCs, DCS, or SCADA systems.
Engineered for extreme conditions, the module operates in a wide temperature range (-20°C to +70°C) and withstands vibration, shock, and electromagnetic interference (EMI). Its compact design (111mm x 335mm x 51mm) and DIN-rail mounting simplify installation in control panels or remote enclosures.

ICS Triplex T8850

ICS Triplex T8850

T8800C: Technical Specifications
  • Model Number: T8800C
  • Manufacturer: ICS Triplex (Honeywell)
  • Product Type: Safety-Critical Digital Input Module
  • Input Capacity: 16 digital input channels
  • Operating Voltage: 24VDC (nominal), 18-30VDC (range)
  • Input Type: Dry contact, NPN/PNP transistor (configurable)
  • Communication Protocol: Modbus RTU (RS-485)
  • Redundancy Level: Triple Modular Redundancy (TMR)
  • Fault Detection Time: <20 milliseconds
  • Operating Temperature: -20°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Humidity: 5-95% non-condensing
  • Protection Rating: IP20 (indoor use)
  • Mounting: DIN rail or panel mount
  • Dimensions: 111mm (W) x 335mm (H) x 51mm (D)
  • Weight: ~900g
  • Certifications: IEC 61508 SIL 3, DO-178C DO-254 Level A, UL, CE
T8800C: Core Features & Customer Value
Triple Redundancy for Zero Downtime: The T8800C’s TMR design ensures that a single channel failure (e.g., due to a faulty sensor or wiring error) does not disrupt the system. The voter circuit cross-validates signals from all three channels, rejecting anomalies and maintaining safe operation. This is critical for industries like oil & gas, where downtime can result in significant financial losses or safety risks.
SIL 3 Certification for Safety-Critical Applications: Certified to IEC 61508 SIL 3, the module meets the highest standards for functional safety. It is designed to handle applications where failures could cause catastrophic harm (e.g., emergency shutdown systems, fire and gas detection). The DO-178C DO-254 Level A certification further validates its reliability for aerospace and defense applications.
Advanced Diagnostics for Proactive Maintenance: Built-in diagnostics monitor signal integrity, channel health, and communication status. The module detects faults (e.g., open circuits, short circuits) in <20ms and reports them via Modbus RTU, enabling operators to address issues before they escalate. This reduces unplanned downtime and maintenance costs.
Harsh Environment Resilience: The T8800C operates in extreme temperatures (-20°C to +70°C) and withstands vibration (up to 5g) and shock (up to 30g). Its IP20 rating protects against dust and accidental contact, making it suitable for outdoor installations (e.g., offshore platforms) or dusty industrial environments.
Seamless Integration with Existing Systems: The module supports Modbus RTU (RS-485), a widely used industrial protocol. This allows easy integration with PLCs (e.g., Allen-Bradley, Siemens), DCS (e.g., Honeywell Experion), and SCADA systems. The T8800C also features configurable input types (dry contact/NPN/PNP) to match diverse field devices (e.g., pushbuttons, limit switches, proximity sensors).

ICS Triplex T8850

ICS Triplex T8850

T8800C: Typical Applications
The T8800C is deployed in safety-critical industrial processes​ where reliability and uptime are paramount:
  • Oil & Gas: Monitors emergency stop buttons, valve positions, and pipeline pressure sensors in offshore platforms or refineries. Its TMR design ensures safe shutdowns during equipment failures or leaks.
  • Chemical Processing: Controls safety interlocks for reactors, pumps, and storage tanks. The module’s SIL 3 certification complies with strict chemical industry safety regulations.
  • Power Generation: Monitors turbine status, generator protection relays, and switchgear signals in thermal or renewable energy plants. Its wide temperature range supports outdoor substation installations.
  • Manufacturing: Integrates with robotic arms, conveyor systems, and packaging machines to implement safety functions (e.g., emergency stops, guard monitoring). The module’s low fault detection time minimizes production downtime.

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