UNIT_PROCEDURE_SEQ
S88 unit-procedure sequencer: ordered operations under the standard state model with per-operation timeout supervision.
When to use it
Use UNIT_PROCEDURE_SEQ when one unit procedure — charge, mix, react, transfer, cool, discharge — is made of several operations that must execute in a fixed order on one unit, and an operation that stalls must hold the unit rather than wait forever.
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 |
|---|---|
| UP_ID | USINT |
| N_OPS | USINT |
| ENABLE | BOOL |
| START | BOOL |
| HOLD | BOOL |
| RESTART | BOOL |
| PAUSE | BOOL |
| RESUME | BOOL |
| STOP | BOOL |
| ABORT | BOOL |
| RESET | BOOL |
| OP_COMPLETE | BOOL |
| ACTION_DONE | BOOL |
| OP_FAULT | BOOL |
| OP_TMO | TIME |
| ACT_TMO | TIME |
| ACK | BOOL |
Outputs
| Port | Type | Unit |
|---|---|---|
| OP | USINT | — |
| STATE | USINT | — |
| OP_DONE | BOOL | — |
| UP_DONE | BOOL | — |
| FAIL | BOOL | — |
| RUNNING | BOOL | — |
| PAUSED | BOOL | — |
| HELD | BOOL | — |
| STOPPED | BOOL | — |
| ABORTED | BOOL | — |
| ACTIVE_UP | USINT | — |
| OP_ELAPSED_S | REAL | s |
| ALM_OP_TMO | BOOL | — |
| ALM_OP_FAULT | BOOL | — |
| ALM_ACT_TMO | BOOL | — |
| ALM_ILLEGAL_CMD | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
UNIT_PROCEDURE_SEQ 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
- 10
- Simulated scans
- 131
- 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 UNIT_PROCEDURE_SEQ — 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.