COLD_CHAIN_MON
Cold-chain excursion accounting: cumulative time-above-limit against a published budget, an unmonitored period counted as an excursion, and a suspect latch a lot reset cannot erase.
When to use it
Use COLD_CHAIN_MON when chilled or frozen product sits in a store, a blast cell, a holding buffer or a trailer, and the food-safety system limits the TOTAL time it may spend above its storage temperature rather than only alarming on the instantaneous value.
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 | — |
| T | REAL | degC |
| T_OK | BOOL | — |
| T_MAX | REAL | degC |
| T_MIN | REAL | degC |
| MAX_DURATION | TIME | — |
| DEADBAND | REAL | degC |
| LOT_RESET | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| EXCURSION_MIN | LREAL | min |
| CONT_MIN | REAL | min |
| BUDGET_PCT | REAL | % |
| PEAK_T | REAL | degC |
| IN_SPEC | BOOL | — |
| PRODUCT_SUSPECT | BOOL | — |
| ALM_EXCURSION | BOOL | — |
| ALM_LOW_TEMP | BOOL | — |
| ALM_T_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| RESET_BLOCKED | BOOL | — |
| EXCURSION_COUNT | UDINT | — |
| VALID | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
COLD_CHAIN_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
- 13
- Simulated scans
- 534
- 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 COLD_CHAIN_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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