Mitsubishi PLC Alarm Integration

I want to strengthen the safety layer of an existing ammonia–glycol chilling unit by adding a dedicated monitoring and alarm package in the Mitsubishi PLC. The refrigeration sequence itself is running well; what is missing is a robust set of alarms and automatic shutdown logic that will trip instantly on critical conditions and log everything for later analysis.

Key alarm blocks that must be implemented and fully tested are:
• Ammonia leak, pressure, and temperature alarms
• Pump, compressor, and fan fault alarms
• Emergency shutdown and automatic safety shutdown

I am using a Mitsubishi platform (GX Works2/3 ‑ iQ-F series) so please be comfortable working with MELSOFT tools, ladder or structured text, and the built-in safety relays. Deliverables I expect include the commented PLC program, an address & tag list, a short commissioning checklist, and remote assistance during start-up so we can verify each alarm trip in real time.

If you have proven experience adding similar safety layers to industrial refrigeration or chemical chilling plants, let’s discuss the timeline and any additional data you need from my side.