DUAL_AUTH_GATE
Two-person rule: two distinct, sufficiently authorised, co-temporal signatures before a critical GxP action proceeds.
When to use it
Use DUAL_AUTH_GATE when a critical action — a manual addition to a bioreactor, a batch release, an alarm-limit change, a deviation disposition — requires an operator and an independent verifier, and the control system has to prove they were two different people acting together.
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 |
| OPERATOR_REF | STRING |
| VERIFIER_REF | STRING |
| ACTION | STRING |
| OP_SIGNED | BOOL |
| VER_SIGNED | BOOL |
| OP_ROLE | USINT |
| VER_ROLE | USINT |
| MIN_OP_ROLE | USINT |
| MIN_VER_ROLE | USINT |
| WINDOW | TIME |
| ACK | BOOL |
Outputs
| Port | Type |
|---|---|
| BOTH_OK | BOOL |
| DENY_CODE | USINT |
| SIGNED_ACTION | STRING |
| WINDOW_EXPIRED | BOOL |
| ALM_SAME_PERSON | BOOL |
| ALM_CFG_ERR | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 8
- Simulated scans
- 68
- 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 DUAL_AUTH_GATE — 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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