WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
3. Key Technical Specifications
- Product type: Engineering Card for System 57 rack
- Power supply: 18 V to 32 V DC
- Power consumption: 1.5 W typical
- Primary functions: – Routes 24 V DC from DC Input Card to rack backplane – Backplane serial communications controller and monitor – Precision time/date reference – RS232 external engineering interface – Continuous self-validation of hardware, software, and backplane communications
- Expansion: Socket for System 57 special modules
- Dimensions (approx.): 170 mm (L) × 25 mm (W) × 132 mm (H)
- Weight: ≈ 0.15–0.19 kg
- Indicators: Power On (green), Unlocked (red) LEDs
- Operator controls: Push-buttons for Up/Down, Accept/Reject, Print, alarm functions
4. Product Introduction
The Honeywell 05701-A-0361 is the Engineering Card used in System 57 (and 5701) gas-detection control racks. It provides the common operator interface and system management functions for all channel cards installed in the rack.
It routes 24 V DC power to the backplane, manages backplane serial communications, supplies a stable time/date reference, and offers an RS232 engineering port for configuration and diagnostics. Continuous self-validation of its own circuits, software, and backplane traffic helps maintain system integrity in continuous gas-monitoring applications.
05701-A-0361
05701-A-0361
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No Power On LED | Missing or out-of-range 18–32 V DC supply | ✅ High | Measure DC voltage at card input terminals | Verify DC Input Card and supply rails before replacing Engineering Card |
| Rack cards not communicating | Backplane serial controller fault or poor seating | ✅ High | Reseat Engineering Card; check backplane connectors for corrosion | Clean contacts; replace if self-validation fails |
| RS232 port unresponsive | Interface circuit or cable fault | ✅ High | Test with known-good cable and terminal program at 115.2 kbps | Confirm baud and pinout; replace card if port remains dead |
| Incorrect time/date | Clock reference drift or battery issue (if present) | ✅ Medium | Compare displayed time against known accurate source | Reset via push-buttons or engineering port |
| Card shows Unlocked LED permanently | Security interlock or configuration lock active | ✅ High | Check lock status via engineering interface | Clear lock per System 57 procedure |
| Intermittent alarms or inhibit | External channel-card or sensor issue | ❌ Low | Confirm other channel cards report correctly | Focus diagnostics on individual control cards and sensors |
If the card fails continuous self-validation or the above checks do not resolve the issue, photograph the front-panel LEDs, note any displayed messages, and contact technical support with the serial number and rack configuration.
6. Frequently Asked Questions (FAQ)
Q: What is the primary role of the 05701-A-0361? A: It is the Engineering Card for a Honeywell System 57 rack. It supplies the common operator interface, routes 24 V DC to the backplane, controls backplane communications, and provides the RS232 engineering port used for commissioning and maintenance of the channel cards.
Q: Is this card still in production? A: No. The System 57 platform and the 05701-A-0361 Engineering Card are phased out / obsolete. Remaining units are new surplus or refurbished stock. Confirm availability and revision level before ordering.
Q: Can I use this card in a System 5701 rack? A: Yes. It is compatible with both System 57 and System 5701 racks when the correct revision is fitted.
Q: Does the card itself monitor gas sensors? A: No. Individual single- or multi-channel control cards handle the sensor inputs and alarms. The Engineering Card provides the shared interface, power routing, and diagnostics for those cards.
Q: What voltage does it require? A: 18 V to 32 V DC. Typical power draw is 1.5 W.
Q: How do I access configuration or diagnostics? A: Use the front-panel push-buttons for basic functions or connect a terminal to the RS232 engineering port (typically 115.2 kbps) for full access.
Q: Why is the price lower than a current-production Honeywell gas-detection module? A: This is surplus or remaining stock of an obsolete System 57 component. It is functionally tested but no longer supported by the manufacturer with new firmware or long-term spares guarantees.
