Description
Honeywell FC-SAI-1620MV1.4
Technical Specifications
- Channel Quantity: 16 analog input channels
- Input Signal Type: 4mA to 20mA DC
- Input Impedance: 250Ω internal precision shunt resistor
- A/D Resolution: 16 bit
- Channel Isolation: Group isolated, 500V AC isolation rating
- Operating Temperature: -20°C to +70°C
- Conversion Update Rate: Configurable per group
- Supply Power: 24V DC rack backplane power
- Version Revision: V1.4 hardware and firmware revision
Functional Features Over-range and under-range detection for each channel, mark fault status when signal outside 3.6mA to 20.5mA window. Open loop detection for 4-20mA transmitter wiring break. Digital low pass filter configurable for noise suppression. Dual A/D sampling circuit on each channel for safety comparison voting. Front panel LED indicates power, group fault and individual channel fault. Backplane communication with CRC check for measurement data frames.
Application Scenarios SIS pressure, flow, level and temperature transmitter signal acquisition Emergency shutdown system process variable measurement Burner management system analog flame signal monitoring Oil and gas wellhead safety control analog input expansion Safety system spare replacement and I/O point expansion
Performance Parameters
- Measurement Accuracy: ±0.1% full scale
- Zero Drift: <20ppm / °C
- Channel Crosstalk: -65dB
- Fault detection latency: <100ms for open loop condition
- Sampling synchronization across all channels
Material Composition FR4 multilayer PCB, high precision shunt resistors, 16bit sigma-delta ADC chips, reinforced optocoupler isolation, instrumentation amplifier, X7R ceramic capacitors, metal film resistors, screw terminal wiring block, flame retardant plastic housing.
Structural Features Standard plug-in rack card form factor for FC safety rack slot. Removable terminal block for field transmitter wiring. Front panel LED array for power, group fault and channel fault indication. Internal isolation barrier separates field analog side and safety logic side. Card edge gold plated connector for backplane bus connection. Anti-reverse insertion notch on card edge.
Working Principle Field 4-20mA current signal flows through internal precision shunt resistor and converts to voltage signal. Instrument amplifier conditions signal and feeds to dual independent ADC converters. Logic chip compares two conversion results. If values are within tolerance band, valid measurement value is packed into CRC protected frame and transmitted to safety controller. If deviation exceeds threshold or loop current out of valid range, fault flag is generated.
Installation Requirements Field transmitter wiring must use twisted shielded pair cable, single end grounding at cabinet side. Separate analog signal cable from high voltage power cable in cable tray. Calibrate zero and span after module replacement for critical safety measurement loop. Confirm firmware V1.4 compatibility with host safety controller before commissioning. Tighten terminal screw to specified torque to avoid high resistance contact.
Usage Notes Do not apply voltage signal directly to 4-20mA current input channel. Shield must not be grounded at both transmitter and cabinet terminals. Filter time constant setting must match process response speed requirement. Do not bypass dual ADC comparison diagnostic circuit.
