BACKFLOW_MON
Cross-connection and backflow monitor: differential across the assembly, low-differential warning, confirmed reverse-flow isolation and event recording.
When to use it
Use BACKFLOW_MON when a potable supply crosses into process water — a wash-water, chemical make-up, tanker-fill or plant-service connection — through a backflow-prevention assembly whose upstream and downstream pressures are both instrumented.
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 | — |
| P_UP | REAL | kPa |
| P_DOWN | REAL | kPa |
| P_UP_OK | BOOL | — |
| P_DOWN_OK | BOOL | — |
| MIN_DP | REAL | kPa |
| REV_DP | REAL | kPa |
| DB | REAL | kPa |
| CONFIRM_T | TIME | — |
| RELIEF_OPEN | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| REVERSE | BOOL | — |
| DP_KPA | REAL | kPa |
| ISOLATE_CMD | BOOL | — |
| VALID | BOOL | — |
| ALM_LOW_DP | BOOL | — |
| ALM_RELIEF | BOOL | — |
| ALM_P_FAULT | BOOL | — |
| REVERSE_S | REAL | s |
| EVENT_COUNT | DINT | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
BACKFLOW_MON 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
- 9
- Simulated scans
- 110
- 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 BACKFLOW_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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