DCW_BIOCIDE_SHOCK
Scheduled biocide shock dosing with pre-dose bleed lockout, contact-time hold and circulation interlocks.
When to use it
Use DCW_BIOCIDE_SHOCK when a cooling tower receives slug (shock) biocide on a repeating schedule and the blowdown/bleed valve must be locked out before, during and after the dose so the biocide gets its contact time.
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 |
|---|---|
| ENABLE | BOOL |
| TRIGGER | BOOL |
| ABORT | BOOL |
| TANK_EMPTY | BOOL |
| TOWER_RUNNING | BOOL |
| CONFIRM_T | TIME |
| INTERVAL | TIME |
| PRE_LOCKOUT_T | TIME |
| DOSE_T | TIME |
| HOLD_T | TIME |
| ACK | BOOL |
Outputs
| Port | Type | Unit |
|---|---|---|
| DOSE_CMD | BOOL | — |
| BLEED_LOCKOUT | BOOL | — |
| CYCLE_ACTIVE | BOOL | — |
| PHASE | INT | — |
| PHASE_REMAIN_S | REAL | s |
| NEXT_DOSE_S | REAL | s |
| DOSE_COUNT | INT | — |
| ALM_TANK_EMPTY | BOOL | — |
| ALM_NO_CIRC | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DCW_BIOCIDE_SHOCK 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
- 229
- 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 DCW_BIOCIDE_SHOCK — free
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