FTA-T-08 Honeywell Safety Series Fail-Safe Digital Output Module
Manufacturer: HONEYWELL
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Part Number: TARJETA FTA-T-08
Condition：New with Original Package
Product Type: Digital Output Modules
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Honeywell FTA-T-08 Fail-Safe Digital Output Module
The Honeywell FTA-T-08 serves as the primary FTA-T-08 Fail-Safe Digital Output Module utilized to execute discrete safety logic actions across Honeywell safety and process automation platforms. The hardware drives external safety-critical loads via four independent channels utilizing dual series-connected relay contacts to enforce de-energization execution paths upon fault discovery.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | FTA-T-08 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.26 - 0.66 kg |
| Dimensions | 14.6 x 7 x 6.8 cm |
| Operating Temp | -40 deg C to +70 deg C |
| Power Consumption | 24 VDC nominal supply requirement |
| Output Channels | 4 independent discrete channels |
| Output Contact Type | Dual electromechanical relays in series per channel |
| Operating Voltage Range | 24 VDC to 230 VAC |
| Output Current Capacity | 2 A maximum per channel |
| Channel Protection | Fused normally open (NO) field contact, 3.15 AT per channel |
| Local Indication | Dedicated LED status indicator per channel |
| Mounting Layout | DIN EN rail snap-in facility |
| Termination Type | Screw terminals |
| Certifications | CE, TUV, UL |
4-20 mA HART Loop Protocol and Channel Isolation
The module architecture provides complete galvanic isolation between the internal logic side and the field-side relay contact terminals. Although the discrete switching hardware handles direct 24 VDC to 230 VAC binary states rather than routing the 4-20 mA HART loop protocol directly, the high-barrier channel-to-system electrical isolation actively protects the common DCS backplane from external voltage surges. This containment prevents induction spikes and high-voltage line transients from affecting the shared reference ground plane, eliminating thermal shifts and protecting the accuracy of nearby analog cards performing cold junction compensation (CJC) processing.
Frequently Asked Questions
Q: How does the series-relay configuration alter the execution of the safety loop?
A: The configuration wires two separate electromechanical relays in series for each output path, ensuring that if one relay contact welds closed, the second contact opens to drive the field device to its designed fail-safe de-energized state.
Q: What are the consequences of replacing a blown loop fuse with a higher current rating?
A: Each channel is engineered around a 3.15 AT fuse; inserting an over-rated fuse bypasses the intentional thermal breakdown threshold, which risks permanent degradation of the isolation barrier and internal circuit traces during field short-circuit events.
Q: Does the module firmware require synchronization cycles during standard runtime operation?
A: The passive hardware terminal layer relies on physical relay contact interruption driven by upstream processor logic, meaning it does not maintain distinct local microcode or require mid-cycle firmware synchronization updates.
Field Installation Guidelines
Snap the assembly onto the designated DIN EN rail structure, ensuring the locking clips secure completely against the rail edge within an ambient thermal environment between -40 deg C and +70 deg C. Verify that all 24 VDC and 230 VAC distribution sources remain isolated before terminating field cables to the screw terminals. Strip conductor insulation cleanly to ensure full compression capture within the screw clamp without leaving exposed copper filaments. Route high-voltage AC or DC load wires through separate wiring raceways distinct from low-voltage analog paths to suppress capacitive noise cross-talk across the automation enclosure.