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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Number of Output Channels | 8 |
| Output Type | Floating, non-commoned, potential-free relay contacts |
| Maximum Output Current | 5 A (fused) |
| Minimum Output Current | 1 mA at 5 V |
| Maximum Output Voltage | 250 Vac / 250 Vdc |
| Maximum Switched Load | 1250 VA / 150 W |
| Nominal Input Voltage | 24 Vdc |
| Maximum Input Voltage | 36 Vdc |
| Relay Pick-up Voltage | 19.2 Vdc |
| Input Current | Typically 40 mA at 24 Vdc |
| Fuse Rating | 5 AT slow-acting (5 × 20 mm) |
| Safety Class | Up to and including SIL3 (IEC 61508) |
| Approvals | CE, UL, TUV, CSA |
| Module Dimensions | 300 × 70 × 60 mm (L × W × H) |
| DIN EN Rails | TS32 / TS35 × 7.5 (used length 301 mm) |
| Termination | Screw terminals, max 2.5 mm² (AWG 14), 0.5 Nm torque |
| Ambient Temperature | –5 °C to +60 °C |
4. Product Introduction
The Honeywell FC-TSRO-0824 is a relay-based Field Termination Assembly (FTA) for SIL3 applications in the Safety Manager system. It interfaces the system interconnection cable (SICC-0001/Lx) to field wiring and provides eight independent, floating, potential-free safe output channels.
Each channel uses three relays plus a fused normally-open field contact (5 AT slow-acting). The contacts are non-commoned and can be wired independently. The module supports loads up to 5 A, 250 Vac/Vdc, or 1250 VA / 150 W and is suitable for applications requiring dry-contact isolation up to SIL3 without fault exclusions. The conformal-coated FC version mounts on standard DIN EN rail.
FC-TSRO-0824
FC-TSRO-0824
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No contact closure at field terminals | Input signal missing or relay not energizing | ✅ High | Measure 24 Vdc at input; verify relay pick-up (>19.2 V); check LED status | Confirm drive signal from controller before replacing FTA |
| Contact closed but no load power | Blown 5 AT fuse or open field wiring | ✅ High | Check fuse continuity; measure across NO contacts under command | Replace fuse with identical 5 AT slow-acting type; verify field circuit |
| Intermittent contact | Loose screw terminal or weak relay | ✅ Medium | Re-torque terminals to 0.5 Nm; cycle output and monitor LED | Tighten terminals; if problem persists, replace FTA |
| Channel will not de-energize | Welded relay contact | ✅ High | Force de-energize command and measure contact state | Replace FTA; welded contacts require module replacement |
| Multiple channels affected | Shared power or cable issue | ❌ Low | Check SICC cable and 24 Vdc supply integrity | Troubleshoot upstream power and cabling first |
If diagnostics remain unclear, capture photos of fuses, terminal torque, LED status, and the drive signal, then contact technical support.
6. Frequently Asked Questions (FAQ)
Q: What is the difference between FC-TSRO-0824 and FC-TSDO-0824?
FC-TSRO-0824 is a relay (dry-contact) FTA with floating potential-free outputs rated 5 A / 250 V. FC-TSDO-0824 is a solid-state FTA for the 24 Vdc 0.55 A SDO-0824 module. They are not interchangeable.
Q: Are the output contacts commoned?
No. The contacts are floating and non-commoned. Each channel can be wired independently.
Q: What fuse must I use?
Only 5 AT slow-acting fuses, 5 × 20 mm. Using a different rating or type compromises protection and SIL rating.
Q: Is this FTA hot-swappable?
No. De-energize the driving output module and field power before disconnecting or replacing the FTA.
Q: Why is new surplus pricing lower than current Honeywell list price?
These are genuine OEM FTAs that were surplus to project requirements or excess factory stock. They are unused, original, and fully functional. They carry a 1-year warranty from the seller and are inspected prior to shipment.
Q: Can I use this for SIL3 applications without additional fault exclusions?
Yes. The TSRO-0824 is designed for applications up to and including SIL3 without the use of fault exclusions when applied according to the Safety Manager hardware guidelines.
Q: What testing is performed before shipment?
Inbound visual and anti-counterfeit inspection, continuity and insulation checks on all channels, fuse verification, mechanical inspection of terminals and DIN-rail clips, and generation of a basic test report. Photos are available on request.
