Honeywell FS-TSAI-1620M Safe Analog Input Field Termination Assembly (FTA)

Product Overview

The Honeywell FS-TSAI-1620M is a Safe Analog Input Field Termination Assembly (FTA) designed for Honeywell Safety Manager systems. It provides 16 channels of 4-20 mA analog input with integrated safety diagnostics, serving as the critical interface between field transmitters (pressure, temperature, flow, level) and the safety controller. Engineered for SIL-rated applications, this FTA ensures accurate analog signal acquisition with built-in line monitoring and fault detection.

Key Features

• 16 Analog Input Channels: 4-20 mA loop-powered or externally powered transmitter support
• Safe Analog Input: SIL-rated signal conditioning for safety instrumented systems
• System Interconnection: SIC cable interface to redundant SAI-1620M I/O modules
• Line Monitoring: Detects open circuits, short circuits, and out-of-range signals
• DIN Rail Mounting: Universal snap-in for TS32/TS35 rails
• Compact Design: Space-efficient for dense control panel layouts

Technical Specifications

• Model: FS-TSAI-1620M (also FC-TSAI-1620M)
• Type: Safe Analog Input FTA
• Channels: 16 analog inputs
• Signal Range: 4-20 mA
• Input Type: Loop-powered or externally powered 2-wire/4-wire transmitters
• Resolution: 12-bit or higher (system dependent)
• Accuracy: ±0.1% typical
• Line Monitoring: Open circuit, short circuit, out-of-range detection
• Dimensions: 60 × 70 × 58 mm (L × W × H)
• DIN Rail: TS32 / TS35 × 7.5
• Wire Size: Max 2.5 mm² (AWG 14)
• Strip Length: 7 mm (0.28 in)
• Tightening Torque: 0.5 Nm (0.37 ft-lb)
• Operating Temperature: -40°C to +70°C
• Approvals: CE, TÜV, UL, CSA, FM

Installation Guide

1. DIN Rail Mount: Snap FTA onto TS32/TS35 rail in control cabinet
2. Transmitter Wiring: Connect 4-20 mA transmitters to screw terminals:
   • Loop-powered: Connect +24V, signal return, and common
   • Externally powered: Connect signal + and signal - only
3. SIC Cable: Plug SIC-C-12 system interconnection cable into SIC connector
4. Redundancy: For redundant SAI-1620M modules, connect both FTAs to paired I/O modules
5. Shield Grounding: Connect cable shields to single-point ground to avoid ground loops

FAQ

Q: Can this FTA support HART protocol?
A: The FS-TSAI-1620M supports 4-20 mA analog signals. For HART digital communication overlay, verify compatibility with specific I/O module revisions or use dedicated HART modules.

Q: What is the difference between FS-TSAI-1620M and FC-TSAI-1620M?
A: They are functionally identical. "FS-" and "FC-" prefixes denote manufacturing batch or regional variants within the same product family.

Q: How does line monitoring work?
A: The FTA continuously monitors loop current. Open circuits (current < 3.6 mA), short circuits, and over-range conditions (> 21 mA) are detected and reported to the safety controller.

Selection Tips

• Use for 4-20 mA transmitter applications in Safety Manager systems
• Verify transmitter power requirements (loop-powered vs. externally powered)
• Ensure paired I/O module is SAI-1620M installed in the chassis
• For RTD/thermocouple inputs, use dedicated temperature input modules instead
• Consider redundant SAI-1620M pairs for SIL 3 applications