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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Function | Fiber optic extender for Series 8 I/O Link |
| Compatible System | Honeywell Series 8 I/O / S8 C300 controller |
| Fiber Type | Multi-mode |
| Power Supply | 20–30 V DC |
| Current Consumption | Approx. 74–85 mA |
| Operating Temperature | –20 °C to +70 °C |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 5–95 % RH, non-condensing |
| Redundancy Support | Dual redundant Combo cable interfaces |
| Isolation / Hazardous Rating | Suitable for industrial environments (check specific certs) |
| Weight (approx.) | 0.34 kg |
4. Product Introduction
The Honeywell 8937-HN is a multi-mode fiber optic extender module designed for Series 8 I/O systems. It extends the I/O Link connection between the S8 C300 controller and remote Series 8 I/O modules, allowing the I/O to be mounted outside the local control cabinet over longer distances.
The module interfaces via Combo cable connectors on the IOTA and converts the electrical I/O Link to fiber for noise-immune, long-distance transmission. It supports dual redundant Combo cable interfaces for higher availability. Powered from 20–30 V DC, it is intended for standard industrial temperature ranges and is used where copper cabling distance or electrical noise becomes a limitation.
8937-HN
8937-HN
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No communication to remote I/O | Fiber break, dirty connector, or wrong fiber type | ✅ High | Inspect fiber ends, clean connectors, verify multi-mode cable | Replace or clean fiber; confirm cable type |
| Link LED off on one side | Power missing or module fault | ✅ High | Measure 20–30 V DC at module power terminals | Verify power supply and polarity |
| Intermittent remote I/O | Marginal optical power or bend radius | ✅ High | Check fiber bend radius and connector seating | Re-terminate or replace fiber run |
| Redundancy not working | Only one Combo interface connected | ✅ Medium | Confirm both redundant Combo cables are installed | Install and verify second redundant path |
| Controller sees local I/O only | Extender not recognized or mis-wired | ✅ High | Verify Combo cable connections on IOTA and extender | Reseat cables and cycle power |
| High error rate | Excessive fiber length or attenuation | ✅ Medium | Measure optical budget / attenuation | Shorten run or use lower-loss fiber |
If the link remains down after these checks, capture LED status on both ends, fiber type and length, and contact technical support with photos of the installation.
6. Frequently Asked Questions (FAQ)
Q: What is the main purpose of the 8937-HN?
A: It extends the Series 8 I/O Link beyond the local cabinet using multi-mode fiber so that remote Series 8 I/O modules can be placed farther from the S8 C300 controller.
Q: What type of fiber does it use?
A: Multi-mode fiber.
Q: Does it support redundancy?
A: Yes. It works with dual redundant Combo cable interfaces for higher availability.
Q: What power does the module require?
A: 20–30 V DC at approximately 74–85 mA.
Q: Can it be used with any Honeywell controller?
A: It is specifically designed for the Series 8 I/O system paired with the S8 C300 controller. Verify compatibility with your exact system revision.
Q: Is this a current-production part?
A: Availability is typically New Original or New Surplus stock. Confirm the exact revision and firmware if your system has specific requirements.
Q: What is the typical operating temperature range?
A: –20 °C to +70 °C.
