CHANGE_REASON_GATE
Reason-for-change gate: a coded reason (and free text where the code demands it) captured and stored BEFORE the GxP parameter write is permitted.
When to use it
Use CHANGE_REASON_GATE when a GxP parameter — an alarm limit, a set point, a recipe value, a calibration coefficient — can be edited from the control system, and site procedure requires the reason for the change to be captured before the value moves.
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 |
|---|---|
| ENABLE | BOOL |
| WRITE_REQ | BOOL |
| PARAM | STRING |
| NEW_VAL | STRING |
| REASON_CODE | USINT |
| REASON_TXT | STRING |
| MAX_CODE | USINT |
| OTHER_CODE | USINT |
| MIN_TXT_LEN | USINT |
| STORE_OK | BOOL |
| WRITE_DONE | BOOL |
| ACK | BOOL |
Outputs
| Port | Type |
|---|---|
| LOGGED | BOOL |
| WRITE_PERMIT | BOOL |
| PENDING | BOOL |
| ENTRY_HASH | STRING |
| REC_PARAM | STRING |
| REC_NEW_VAL | STRING |
| REC_CODE | USINT |
| REC_TXT | STRING |
| REJECT_CODE | USINT |
| ALM_REFUSED | BOOL |
| ALM_CFG_ERR | BOOL |
| CHANGE_COUNT | UDINT |
Validation evidence
- Tests
- 9
- Simulated scans
- 86
- 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 CHANGE_REASON_GATE — free
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