Honeywell FC-SAI-1620M

Description

Product Brief Introduction

FC-SAI-1620M is SIL3 certified analog safety input module for Honeywell Safety Manager SIS system, collecting 4–20mA analog signal transmitted from field pressure, temperature, flow safety transmitters. It converts analog current signal into digital engineering value and uploads to safety main controller for safety threshold interlock calculation, applied to continuous process variable safety monitoring loops.

Technical Specifications & Core Performance Parameters

• Channel Configuration: 16 independent galvanic isolation analog input channels
• Standard Input Signal Range: 4mA ~ 20mA DC two-wire transmitter signal
• Measurement Conversion Precision: ±0.05% full scale signal accuracy
• Galvanic Isolation Rating: 2500VAC channel-to-backplane isolation
• Wire Break Detection: Automatic open-circuit detection for 4–20mA transmitter loop (signal <3mA trigger fault alarm)
• Safety Certification Grade: SIL3 IEC 61508 / IEC 61511
• Backplane Power Consumption: 6.8W maximum
• Physical Dimension: Standard 4TE rack width, 220mm module depth
• Net Weight: 0.45kg
• Operating Temperature Range: 0℃ ~ +70℃ cabinet internal

Material Composition

• Module Housing: Flame-retardant anti-static black PC plastic shell
• Sampling Circuit PCB: Multi-layer high anti-interference FR4 circuit board
• Isolation Component: High linearity isolation optocoupler for analog signal
• Terminal Block: Spring lock gold-plated anti-corrosion wiring terminal

Structural Features

• Single 4TE slide-in rack modular design, compact layout to save cabinet slot resource
• Front panel 16 independent LED channel indicators for signal normal status and wire break fault
• Internal each channel completely independent isolation circuit partition, no channel crosstalk interference
• Bottom wiring terminal block divided into 4 groups separated channel wiring area for convenient field classification wiring

Working Principle

1. Two-wire safety transmitter 4–20mA analog current signal input to channel front-end sampling resistance
2. Isolation optocoupler converts analog current signal into isolated voltage sampling signal
3. High-precision 16-bit ADC chip converts analog signal into digital engineering value
4. On-board FPGA chip uploads digital measurement data to FC-QPP-0001 main processor via backplane safety bus
5. Real-time loop current detection: signal below 3mA judges transmitter wire break fault, upload fault code to SIS alarm system

Function Features

1. 16-channel high-density analog safety signal collection for multi-variable safety monitoring loops
2. Per-channel complete galvanic isolation eliminate field transmitter ground loop measurement deviation
3. Ultra-high ±0.05% full scale measurement precision meets strict safety process variable monitoring requirement
4. Automatic two-wire transmitter loop wire break fault diagnosis function
5. Hot-swap compatible without interrupting other channel analog signal collection

Advantage Highlights

1. SIL3 full safety certification directly used for safety instrument system analog monitoring loops without redundant external signal isolator
2. 16-channel high-density design reduce cabinet module quantity and internal wiring complexity
3. High linearity isolation circuit without analog signal attenuation and distortion
4. Built-in loop wire break detection function eliminate separate circuit wire break monitoring equipment
5. Wide operating temperature range adapts to unheated industrial control cabinet environment

Applicable Industries

Petrochemical reactor temperature/pressure safety monitoring, refinery flow safety interlock loop, natural gas pipeline pressure over-limit protection, chemical storage tank liquid level safety monitoring

Installation Requirements

1. Slide horizontally into FC-RPB2N12 backplane standard slot, lock front panel fixing buckle
2. Field transmitter wiring use shielded twisted pair cable, single-point grounding at cabinet safety ground row
3. Each channel two-wire loop wire length maximum limit 800 meters, over-length add signal repeater
4. Reserve 20mm vertical ventilation gap between adjacent modules
5. Cabinet internal temperature maintain within 0℃ ~ +70℃

Usage Precautions

1. Forbid connecting voltage signal directly to analog input channel, will burn front-end sampling resistance and isolation optocoupler
2. Two-wire transmitter power supply must match module built-in loop power standard, do not connect external additional power supply
3. After module replacement complete channel analog signal calibration test
4. Quarterly inspection of terminal wiring tightening status to avoid loose wire break false fault alarm
5. Avoid installing near high-power frequency converter strong electromagnetic interference equipment