ICS Triplex‑T8801 Analogue Input Module

ICS Triplex‑T8801 Analogue Input Module

Product Brief Introduction: T8801 is triple‑modular redundant analog input module of Trusted safety control system. It receives standard 4‑20 mA analog signals from field transmitters. The module converts analog field measurement into digital values, completes triple‑channel voting processing, and provides accurate measurement data for safety interlock and protection logic execution.

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Description

ICS Triplex‑T8801 Analogue Input Module

Technical Specifications:

  • Input Signal Standard: 4‑20 mA two‑wire transmitter analog signal
  • Channel Quantity: 8 analog input channels
  • Input Impedance: 100 Ω typical
  • Measurement Accuracy: ±0.1 % full‑scale range
  • Conversion Resolution: 16‑bit analog‑to‑digital conversion
  • Field Transmitter Supply: 24 VDC loop power supplied from module terminals
  • Galvanic Isolation: 2500 VDC between field loop and internal logic circuit
  • Operating Temperature: 0 °C ~ +60 °C
  • Storage Temperature: −40 °C ~ +85 °C
  • Humidity: 5 %‑95 % relative humidity, non‑condensing
  • Vibration Resistance: 2 g, 10‑500 Hz
  • Shock Resistance: 15 g, 11 ms duration
  • Net Weight: 0.74 kg
  • Certifications: SIL 3, ATEX, IECEx, CE mark

Functional Features:

  • TMR triple‑modular redundant analog sampling circuit, hardware voting improves measurement reliability
  • Supports two‑wire 4‑20 mA field transmitter power supply directly from module
  • Per‑channel open‑circuit, short‑circuit diagnostic capability for transmitter loop
  • Individual LED status indicator for every analog channel
  • 16‑bit high‑resolution ADC conversion guarantees measurement precision
  • Hot‑swap operation supported under qualified Trusted system setup
  • Detects signal over‑range and under‑range condition, reports fault events to main controller
  • Configurable signal damping filter to suppress field measurement noise

Application Scenarios: Petrochemical process safety interlock, pressure / flow / temperature safety monitoring, emergency shutdown analog measurement input, fire‑gas system analog sensor acquisition, power plant safety‑related process variable monitoring, offshore production platform safety instrument system.

Material Composition:

  • Structural frame: Flame‑retardant metal‑plastic composite module frame
  • Internal circuit: Conformal coated multi‑layer industrial PCB, high‑precision ADC chips
  • Field wiring part: Screw‑locked spring terminal blocks for analog signal loops
  • Backplane interface: Gold‑plated 96‑pin high‑reliability backplane connector
  • Fastening components: Anti‑corrosion stainless steel locking hardware

Structural Characteristics: Standard Trusted rack slot compatible module form factor. Front‑panel equips LED status indicators and analog signal terminal blocks. Rear‑side 96‑pin backplane connector realizes data exchange and logic power supply. Internal shielding structure isolates low‑level analog signal circuits from digital noise circuits. Dual side spring latches achieve mechanical locking inside rack.

Working Principle: Field 4‑20 mA transmitter loop current enters three independent analog sampling circuits. Each channel converts analog current signal into digital value through high‑precision ADC. Hardware voting logic compares three groups of sampling data, selects valid measurement result. Diagnostic circuits monitor loop current magnitude, identify open‑loop, short‑loop, over‑range and under‑range failure states. Measurement data and fault information transfer to main processor via backplane bus.

Installation Requirements:

  1. Insert T8801 module into available slot of Trusted system rack.
  2. Fasten two side locking latches for complete backplane connector contact.
  3. Deploy shielded twisted‑pair cables for all 4‑20 mA analog field loops. Connect cable shield to single‑point grounding.
  4. Follow terminal assignment diagram for two‑wire transmitter wiring. Do not mix digital signal wiring with analog signal wiring.
  5. Complete rack protective ground connection with site safety grounding busbar.

Usage Notes:

  • Do not exceed maximum allowable loop load resistance specified for transmitter loop. Excessive resistance causes signal distortion.
  • Analog signal cables must keep physical separation from high‑voltage power cables to avoid induced interference.
  • Confirm transmitter loop polarity during field wiring. Reverse polarity leads to channel abnormal measurement.
  • Periodically verify measurement accuracy in long‑term operating safety facilities.
  • Hot‑swap activity must comply with official Trusted system operation procedures.

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