TIME_SYNC_VERIFY
Trusted-time verification for audit timestamps: the MAGNITUDE of the offset from the reference, confirmed over time, with a freshness bound and an unproven-time totaliser.
When to use it
Use TIME_SYNC_VERIFY when audit entries, electronic signatures or batch records are timestamped by a controller or its historian, and the control system has to be able to state that the clock behind those timestamps was demonstrably synchronised to a trusted reference at the time.
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 | — |
| NTP_OFFSET_MS | REAL | ms |
| MAX_OFFSET | REAL | ms |
| SRC_OK | BOOL | — |
| OFFSET_UPDATED | BOOL | — |
| SYNC_AGE_TMO | TIME | — |
| CONFIRM_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| SYNCED | BOOL | — |
| OFFSET_ABS | REAL | ms |
| FAULT_CODE | USINT | — |
| ALM_DRIFT | BOOL | — |
| ALM_NO_SOURCE | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| DRIFT_TIME_S | REAL | s |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 326
- 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 TIME_SYNC_VERIFY — free
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