DCW_SOFTENER_TRAIN
Duplex base-exchange softener: service/standby vessel selection, volume- and hardness-triggered changeover, and a supervised four-step regeneration.
When to use it
Use DCW_SOFTENER_TRAIN when makeup to a cooling tower (or to a humidifier / steam-humidification header) passes through a duplex base-exchange softener, so that one vessel treats while the other stands by regenerated, and hardness must never reach the tower unannounced.
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 | — |
| FLOW | REAL | m3/h |
| FLOW_OK | BOOL | — |
| HARDNESS | REAL | mg/L |
| HARDNESS_OK | BOOL | — |
| HARD_LIMIT | REAL | mg/L |
| HARD_DELAY | TIME | — |
| HARD_PROOF_T | TIME | — |
| CAPACITY_M3 | REAL | m3 |
| SALT_OK | BOOL | — |
| V1_AVAIL | BOOL | — |
| V2_AVAIL | BOOL | — |
| REGEN_REQ | BOOL | — |
| BRINE_DRAW_T | TIME | — |
| SLOW_RINSE_T | TIME | — |
| FAST_RINSE_T | TIME | — |
| REFILL_T | TIME | — |
| STEP_TMO_MARGIN | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| SERVICE_V2 | BOOL | — |
| V1_SERVICE_CMD | BOOL | — |
| V2_SERVICE_CMD | BOOL | — |
| V1_REGEN_CMD | BOOL | — |
| V2_REGEN_CMD | BOOL | — |
| CMD_BRINE | BOOL | — |
| CMD_SLOW_RINSE | BOOL | — |
| CMD_FAST_RINSE | BOOL | — |
| CMD_REFILL | BOOL | — |
| REGEN_STATE | DINT | — |
| REGEN_VESSEL | DINT | — |
| REGEN_BUSY | BOOL | — |
| REGEN_PEND | BOOL | — |
| SERVICE_VOL_M3 | REAL | m3 |
| CAP_REMAIN_PCT | REAL | % |
| REGEN_COUNT | DINT | — |
| ALM_HARDNESS | BOOL | — |
| ALM_NO_SALT | BOOL | — |
| ALM_REGEN_FAULT | BOOL | — |
| REGEN_FAULT_STEP | DINT | — |
| ALM_REGEN_INEFF | BOOL | — |
| ALM_NO_STANDBY | BOOL | — |
| ALM_BOTH_UNAVAIL | BOOL | — |
| ALM_FLOW_FAULT | BOOL | — |
| ALM_HARD_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Supervised control write
DCW_SOFTENER_TRAIN 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
- 16
- Simulated scans
- 453
- 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
Download DCW_SOFTENER_TRAIN — free
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