MAINT_DUE_TRACK
Run-hours maintenance scheduling with lead-time warning, overdue escalation and meter-reset detection.
When to use it
Use MAINT_DUE_TRACK when an asset with a run-hour meter — generator, chiller, CRAC fan, pump, UPS fan bank — is serviced on an hours interval rather than a calendar, and the controller has to say how many hours are left before the next service.
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 | — |
| RUN_HOURS | LREAL | h |
| INTERVAL_H | REAL | h |
| BASELINE_H | REAL | h |
| WARN_H | REAL | h |
| OVERDUE_H | REAL | h |
| SERVICED | BOOL | — |
| RESET_CONF | TIME | — |
| METER_OK | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| HOURS_TO_DUE | REAL | h |
| HOURS_SINCE_SVC | REAL | h |
| LAST_SVC_H | REAL | h |
| PCT_USED | REAL | % |
| DUE | BOOL | — |
| ALM_DUE_SOON | BOOL | — |
| ALM_OVERDUE | BOOL | — |
| ALM_METER_RESET | BOOL | — |
| ALM_METER_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| VALID | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
MAINT_DUE_TRACK 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
- 8
- Simulated scans
- 53
- 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 MAINT_DUE_TRACK — 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.