LIFT_STATION_SEQ
Lift-station lead/lag pump sequencing on wet-well level, with motor-cycling limiting and float backup.
When to use it
Use LIFT_STATION_SEQ when a sewage lift station or pumping station draws down a wet well with two pump stages on level, the motors have a manufacturer's starts-per-hour limit, and a high-level float has to keep the station pumping when the level transmitter fails.
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 | — |
| LEVEL | REAL | % |
| LVL_OK | BOOL | — |
| BACKUP_HI | BOOL | — |
| ON_1 | REAL | % |
| ON_2 | REAL | % |
| OFF | REAL | % |
| LAG_OFF | REAL | % |
| HIGH_LVL | REAL | % |
| MAX_STARTS_H | USINT | — |
| FLOAT_RUN_ON | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type |
|---|---|
| CALLS | USINT |
| START_HELD | BOOL |
| STARTS | UDINT |
| FLOAT_MODE | BOOL |
| ALM_HIGH_LEVEL | BOOL |
| ALM_LVL_FAULT | BOOL |
| ALM_CFG_ERR | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
LIFT_STATION_SEQ 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
- 7
- Simulated scans
- 168
- 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 LIFT_STATION_SEQ — free
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