REFRIG_PLANT_MON
Ammonia / CO2 refrigeration plant supervision — measured COP, pressure-ratio trending, and a latched leak alarm that calls machinery-room ventilation.
When to use it
Use REFRIG_PLANT_MON when an industrial refrigeration plant serves chilled or frozen storage, and its efficiency, its suction and discharge pressures and its machinery-room gas detection all have to be supervised from the plant PLC alongside the safety system that actually protects people.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| ENABLE | BOOL | — |
| SUCT_P | REAL | barg |
| DISCH_P | REAL | barg |
| NH3_PPM | REAL | ppm |
| DUTY_KW | REAL | kW |
| POWER_KW | REAL | kW |
| PRESS_OK | BOOL | — |
| GAS_OK | BOOL | — |
| PWR_OK | BOOL | — |
| LEAK_PPM | REAL | ppm |
| HI_PPM | REAL | ppm |
| PPM_DB | REAL | ppm |
| SUCT_LO | REAL | barg |
| DISCH_HI | REAL | barg |
| P_DB | REAL | bar |
| SWAP_TOL | REAL | bar |
| COP_LO | REAL | kW/kW |
| COP_DB | REAL | kW/kW |
| MIN_PWR | REAL | kW |
| ALM_DLY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| COP | REAL | kW/kW |
| LEAK | BOOL | — |
| PRESS_RATIO | REAL | bar/bar |
| VENT_CMD | BOOL | — |
| VALID | BOOL | — |
| ALM_LEAK_HIGH | BOOL | — |
| ALM_GAS_FAULT | BOOL | — |
| ALM_PRESS_FAULT | BOOL | — |
| ALM_METER_FAULT | BOOL | — |
| ALM_SUCT_LOW | BOOL | — |
| ALM_DISCH_HIGH | BOOL | — |
| ALM_COP_LOW | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
REFRIG_PLANT_MON commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 9
- Simulated scans
- 219
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
- Conforms to IEC 61499
Download REFRIG_PLANT_MON — free
Create a free Ri Tech account to download the block. You get the Structured Text body, the Rockwell Add-On Instruction (.L5X), the Schneider Control Expert DFB (.XDB), PLCopen XML, the IEC 61499 function block type (.fbt) and the datasheet.
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Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.