DCW_RO_TRAIN_CTRL
RO train start/stop sequencing with low-pressure flush, pressure ramp, permeate divert and membrane protection trips.
When to use it
Use DCW_RO_TRAIN_CTRL when a reverse-osmosis train has to be started, stopped and protected automatically — flush before pressurising, ramp the high-pressure pump, hold permeate off the storage tank until it is on spec, and flush the concentrate off the membranes on every stop.
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 | — |
| SUCT_PRESS | REAL | bar |
| FEED_PRESS | REAL | bar |
| CONC_PRESS | REAL | bar |
| PRESS_OK | BOOL | — |
| INLET_VLV_OPEN | BOOL | — |
| PERM_COND | REAL | uS/cm |
| COND_OK | BOOL | — |
| FAULT | BOOL | — |
| SUCT_LO_BAR | REAL | bar |
| DP_HI_BAR | REAL | bar |
| ON_SPEC_USCM | REAL | uS/cm |
| OFF_SPEC_USCM | REAL | uS/cm |
| COND_TRIP_USCM | REAL | uS/cm |
| PRESS_TRIP_DLY | TIME | — |
| SUCT_PROVE_TIME | TIME | — |
| COND_TRIP_DLY | TIME | — |
| PREFLUSH_TIME | TIME | — |
| RAMP_TIME | TIME | — |
| FLUSH_STOP_TIME | TIME | — |
| DIVERT_TMO | TIME | — |
| FLUSH_SPEED_PCT | REAL | % |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| STATE | INT | — |
| HP_PUMP_CMD | BOOL | — |
| HP_SPEED_PCT | REAL | % |
| INLET_VLV_CMD | BOOL | — |
| FLUSH_VLV_CMD | BOOL | — |
| PERM_DIVERT_CMD | BOOL | — |
| PERM_TO_SERVICE | BOOL | — |
| RUNNING | BOOL | — |
| DP_BAR | REAL | bar |
| TRIPPED | BOOL | — |
| ALM_LOW_SUCT | BOOL | — |
| ALM_HIGH_DP | BOOL | — |
| ALM_HIGH_COND | BOOL | — |
| ALM_INLET_FAIL | BOOL | — |
| ALM_FAULT | BOOL | — |
| ALM_DIVERT_TMO | BOOL | — |
| ALM_PRESS_FAULT | BOOL | — |
| ALM_COND_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DCW_RO_TRAIN_CTRL 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
- 15
- Simulated scans
- 556
- 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_RO_TRAIN_CTRL — 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.