Product Short Description
Product Name: Fail-Safe 0(4)–20 mA Analog Input Field Termination Assembly (FTA)
Product Overview: The FTA-T-14 is a 16-channel fail-safe analog input FTA designed for Honeywell’s FSC (Fail-Safe Control) system. It provides signal adaptation and safety isolation between field 4–20 mA sensors and the FSC module, with channel-group isolation and automatic transition to a safe state on failure.
Description
Technical Specifications:
- Product Type: 16-channel 0(4)–20 mA Analog Input FTA
- Channels: 16 (2 groups of 8, sharing a 0 V common per group)
- Input Signal: 0–25 mA DC, compatible with 0(4)–20 mA transmitters
- Input Resistance: 250 Ω (±1%)
- Fuse Rating: 250 mA slow-acting, 5 × 20 mm or 5 × 25 mm
- SIC Connector: 1FF × 16 (1 connector of 16 signals, with one fuse per 8 signals)
- Field Terminals: 16 groups of 4 screw terminals; 2 groups of 2 screw terminals for external power; 2 earth screw terminals (T64/T)
- Power Requirement: External 30 V DC on field side; loop no-load current approx. 3 mA
- Max Voltage: 36 V AC / 50 V DC (OV Cat 3); 125 V AC / 150 V DC (OV Cat 2)
- Isolation: Channel-to-logic / channel-to-channel 1500 V AC (1 minute) per IEC 61010-1
- Mounting: TS32 / TS35 × 7.5 DIN rail
- Dimensions (L×W×H): 145 × 70 × 65 mm
- DIN Rail Length: 146 mm
- Terminal: Screw type; max wire 2.5 mm (AWG 14); strip 7 mm; torque 0.5 Nm
- Approvals: CE, UL
- Hazardous Area: Class I, Division 2 compliant; SIL 3 capable per IEC 61508
Key Features: Channel-group isolation for safety; fail-safe operation with automatic safe-state transition; current/voltage limiting for hazardous-area field instruments; external power monitoring with fault reporting; compatible with FSC redundant architecture.
Working Principle: The 4–20 mA field signal is received on screw terminals, conditioned through a 250 Ω resistor (converting to 0–4.1 V), fused at 250 mA per group, then passed via the SIC connector to the FSC controller. Group isolation and fusing ensure a fault on one group does not propagate.
Application Scenarios: Safety-critical SIL 3 applications in petrochemical and power-generation industries; interfacing 4–20 mA pressure, temperature, flow and level transmitters to Honeywell FSC systems; hazardous-area (Class I, Div 2) installations.
Installation Requirements: Mount on TS32/TS35 × 7.5 DIN rail using 146 mm rail length; wire field devices to the 16 groups of 4 screw terminals; connect external 30 V DC to the two 2-terminal groups; attach earth to T64/T terminals; plug the 1FF × 16 SIC connector into the FSC controller; use AWG 14 max, 7 mm strip, 0.5 Nm torque.
Usage Notes: Observe correct polarity for loop-powered vs. externally-powered transmitters; verify SIL 3 and hazardous-area ratings match project requirements; follow FSC safety-shutdown procedures before hot-swapping in redundant configurations.
Reviews
There are no reviews yet.