ORP_MON
Oxidation-reduction potential monitoring with range validation, last-good hold, fouled-electrode detection and a disinfection-power permissive.
When to use it
Use ORP_MON when an ORP electrode is used to confirm that a stream has oxidising power — a chlorinated potable or reuse stream, a pool circuit, or a dechlorination or metals-reduction stage — and the reading has to be qualified before anything acts on it.
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 |
|---|---|---|
| PARAMS | STRING | — |
| ENABLE | BOOL | — |
| ORP_RAW_MV | REAL | mV |
| RAW_OK | BOOL | — |
| LO | REAL | mV |
| HI | REAL | mV |
| RANGE_LO | REAL | mV |
| RANGE_HI | REAL | mV |
| FILT_T | TIME | — |
| DISINFECT_MV | REAL | mV |
| DISINFECT_HYST_MV | REAL | mV |
| STUCK_BAND | REAL | mV |
| STUCK_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| ORP_MV | REAL | mV |
| OK | BOOL | — |
| DISINFECT_OK | BOOL | — |
| ALM_LO | BOOL | — |
| ALM_HI | BOOL | — |
| ALM_FAULT | BOOL | — |
| ALM_STUCK | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Validation evidence
- Tests
- 7
- Simulated scans
- 621
- 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 ORP_MON — 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 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.