WATER_HAMMER_GUARD
Pump-control-valve start and stop sequencing: slow open after the pump proves, slow close BEFORE the pump stops, with position and start-proof supervision.
When to use it
Use WATER_HAMMER_GUARD when a pump discharges into a rising main through a powered pump-control valve, and the column of water in that main must be accelerated and decelerated slowly enough that the check valve never slams.
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 | — |
| START_REQ | BOOL | — |
| PUMP_RUN | BOOL | — |
| VALVE_T | TIME | — |
| CLOSE_PCT | REAL | % |
| START_TMO | TIME | — |
| VALVE_FB_PCT | REAL | % |
| FB_OK | BOOL | — |
| FB_TOL_PCT | REAL | % |
| FB_DLY | TIME | — |
| ESTOP | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| VALVE_PCT | REAL | % |
| PUMP_CMD | BOOL | — |
| STATE | INT | — |
| SEQ_BUSY | BOOL | — |
| SEQ_DONE | BOOL | — |
| ALM_PUMP_FAIL | BOOL | — |
| ALM_PUMP_LOST | BOOL | — |
| ALM_VALVE_FAIL | BOOL | — |
| START_INHIBIT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
WATER_HAMMER_GUARD 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
- 549
- 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 WATER_HAMMER_GUARD — 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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