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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Type | High-performance process controller |
| System Compatibility | Symphony Enterprise Management and Control System, INFI 90 OPEN |
| I/O Support | Harmony block I/O, Harmony rack I/O, S800 I/O |
| Communication | Hnet bus and I/O expander bus (simultaneous) |
| Form Factor | Rack-mounted controller |
| Redundancy | Supports redundant configurations (with matching primary) |
| Firmware | Multiple revisions (confirm match for replacement) |
| Status | Legacy / limited availability |
Exact memory capacity, scan times, and supported function codes depend on the installed firmware revision. Always verify the revision against the existing system.
4. Product Introduction
The ABB BRC-300 is a high-performance, high-capacity process controller designed for the Symphony / INFI 90 OPEN control system. It collects process I/O, executes control algorithms, and outputs signals to field devices while exchanging data with other controllers and operator stations on the network.
This controller supports both Harmony block I/O and rack I/O simultaneously and is fully compatible with existing INFI 90 OPEN functionality, communication, and packaging. It is commonly used as a direct replacement in process plants where the original BRC-300 has failed or requires upgrade within the same architecture.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Controller fails to start | Power, configuration, or firmware mismatch | ✅ High | Verify power, switch/jumper settings, and firmware revision | Match settings and firmware to the original unit |
| No communication with I/O | Bus termination or cabling issue | ✅ High | Check Hnet and expander bus terminators and cables | Inspect and reseat bus connections |
| Redundancy fails to switch | Incompatible primary/backup pair | ✅ High | Confirm both controllers are BRC-300 with matching firmware | Do not mix BRC-100/200 with BRC-300 in redundant pairs |
| Status LEDs indicate fault | Internal error or configuration problem | ✅ High | Record LED pattern and status report | Replace controller after confirming external causes |
| Intermittent control problems | Overheating or memory error | ✅ Medium | Check ventilation and status flags | Improve cooling; replace if memory errors persist |
If the problem continues, record the exact firmware revision, switch settings, LED status, and any diagnostic codes, then contact technical support with the information.
BRC-300
BRC-300
6. Frequently Asked Questions (FAQ)
Q: Is the BRC-300 still in production?
A: No. It is a legacy Harmony / Symphony controller. New-surplus and fully tested refurbished units are the primary supply path for maintaining existing systems.
Q: Can I replace a BRC-100 or BRC-200 with a BRC-300?
A: In many cases a BRC-100 can be replaced by a , but certain functions (Batch 90, simulation, UDF, CLIF on some firmware) may not be supported. Do not mix BRC-100/200 with in a redundant pair.
Q: Does firmware revision matter?
A: Yes. The replacement controller must have a compatible firmware revision. Mismatched firmware can cause communication or function code problems.
Q: What I/O does it support?
A: Harmony block I/O, Harmony rack I/O, and S800 I/O. It can communicate on both the Hnet bus and the I/O expander bus at the same time.
Q: Is a Processor Bus Adapter (PBA) required?
A: In many configurations a PBA-200 or equivalent is used with the . Confirm the exact hardware combination in your system.
Q: Can I hot-swap the controller?
A: In redundant systems, follow the proper transfer procedure so the primary halts before the backup takes control. Never pull a running primary without preparing the backup.
Q: Why choose a tested refurbished unit?
A: These process controllers are no longer manufactured. Fully tested units restore control capability quickly while carrying a warranty, avoiding the long lead times of scarce new-surplus stock.
