Product Short Description
Product Name: Fail-Safe Digital Input Field Termination Assembly (FTA)
Product Overview: The FTA-T-21 is a fail-safe digital input FTA for Honeywell’s Fail-Safe Controller system. It provides 24 digital input channels divided into 3 groups of 8, with a 250 mA fuse on each common positive, serving as the interface between system interconnection cables (SIC) and external field wiring for reliable acquisition of field switch states.
Description
Technical Specifications:
- Product Type: Fail-Safe Digital Input FTA
- Channels: 24 (3 groups of 8)
- Max Voltage: 36 V AC / 50 V DC (IEC 1010, OV Cat 3); 125 V AC / 150 V DC (IEC 1010, OV Cat 2)
- Max Continuous Current per Channel: 250 mA
- Input Frequency: >25 kHz
- Response Time: ≤ 2 ms
- Fuse: 250 mA per common positive
- Connection: Screw terminals
- Max Wire Diameter: 0.25 cm² (AWG 14)
- Strip Length: 0.7 cm (0.28 in)
- Tightening Torque: 0.5 Nm (0.37 ft-lb)
- Operating Temperature: –25 °C to 70 °C
- Humidity: 5% to 95% RH (non-condensing)
- Protection Rating: IP65
- Dimensions: 9 × 7 × 5.5 cm
- Weight: 0.14 kg
- DIN Rail: TS32 / TS35 × 7.5; used rail length 9.1 cm
- Approvals: CE, TÜV, UL 508, CSA
- SIC Connectors: Marked “1A”, “1B”, “2A” on the PCB
Key Features: Fail-safe design automatically switches to a predefined safe state on fault or communication interruption; 24 channels with ≤2 ms response for high real-time demands; >25 kHz input detection capability; IP65 enclosure resists dust and water; wide –25 °C to 70 °C operating range with 5–95% RH tolerance; CE/TÜV/UL 508/CSA certified.
Working Principle: Field switch contacts are wired to screw terminals grouped into three 8-channel sets, each with a 250 mA fused common positive. The SIC connectors (1A, 1B, 2A) carry the conditioned signals to the controller. On fault or communication loss, the module forces a safe state and reports diagnostics.
Application Scenarios: Critical control systems requiring reliable digital input acquisition; ESD valve-position feedback; motor-status and trip feedback; harsh industrial environments (IP65) in oil & gas, power, chemical and process plants.
Installation Requirements: Mount on TS32/TS35 × 7.5 DIN rail using 9.1 cm rail length; connect field wiring to appropriately marked screw terminals with AWG 14 max, 0.7 cm strip, 0.5 Nm torque; plug the three SIC connectors (1A, 1B, 2A) into the controller; ensure proper earthing.
Usage Notes: Do not exceed 250 mA per channel or the relevant overvoltage category limits; verify certification (CE/TÜV/UL 508/CSA) matches the installation; IP65 rating permits dust/wash-down exposure but the enclosure must be properly sealed.
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