PW_SYSTEM_MON
Purified-water system monitor — USP <645> Stage 1 conductivity and USP <643> TOC with separate alert and action levels.
When to use it
Use PW_SYSTEM_MON when a purified-water generation and distribution system carries on-line conductivity and TOC instruments and the site's quality system runs alert levels below the compendial action limits so a drifting system is caught before it fails.
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 | — |
| COND_PV | REAL | uS/cm |
| COND_OK | BOOL | — |
| TEMP_PV | REAL | degC |
| TEMP_OK | BOOL | — |
| TOC_PV | REAL | ppb |
| TOC_OK | BOOL | — |
| COND_LIM | REAL | uS/cm |
| TOC_LIM | REAL | ppb |
| ALERT_PCT | REAL | % |
| CONFIRM | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| COND | REAL | uS/cm |
| TOC | REAL | ppb |
| OK | BOOL | — |
| COND_LIM_APPL | REAL | uS/cm |
| STAGE1_OK | BOOL | — |
| STAGE2_REQD | BOOL | — |
| VALID | BOOL | — |
| ALM_COND_ALERT | BOOL | — |
| ALM_TOC_ALERT | BOOL | — |
| ALM_TOC_HIGH | BOOL | — |
| ALM_SENSOR_FAULT | BOOL | — |
| ALM_TEMP_RANGE | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 7
- Simulated scans
- 65
- 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 PW_SYSTEM_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, 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.