OPEN_CHANNEL_FLOW
Open-channel flow from head over a rated structure — V-notch, rectangular weir, Parshall flume, Cipolletti or a custom exponent.
When to use it
Use OPEN_CHANNEL_FLOW when flow in an open channel — works inlet, storm overflow, final-effluent chamber, sludge channel — is measured as head over a weir plate or through a flume, and the rating equation has to be evaluated in the PLC rather than in the transmitter.
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 | — |
| HEAD_MM | REAL | mm |
| HEAD_OK | BOOL | — |
| STRUCT_TYPE | USINT | — |
| K | REAL | m3/h/m^n |
| EXP_CUSTOM | REAL | exponent |
| ZERO_MM | REAL | mm |
| CUTOFF_MM | REAL | mm |
| HEAD_MAX_MM | REAL | mm |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| FLOW | REAL | m3/h |
| FLOW_LPS | REAL | L/s |
| HEAD_M | REAL | m |
| VALID | BOOL | — |
| ALM_OVER_RANGE | BOOL | — |
| ALM_NO_FLOW | BOOL | — |
| ALM_HEAD_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 7
- Simulated scans
- 34
- 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 OPEN_CHANNEL_FLOW — 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.