PHASE_LOGIC
S88 phase-logic interface: the full ISA-88 procedural state engine for one equipment phase, with a safe-state request.
When to use it
Use PHASE_LOGIC when one equipment phase — charge, agitate, heat, hold, transfer, drain, CIP step — is driven from a batch server or a unit-procedure sequencer and must present the standard phase-logic interface rather than a bespoke sequence.
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 |
|---|---|
| PHASE_ID | USINT |
| PARAMS | STRING |
| ENABLE | BOOL |
| START | BOOL |
| HOLD | BOOL |
| RESTART | BOOL |
| PAUSE | BOOL |
| RESUME | BOOL |
| STOP | BOOL |
| ABORT | BOOL |
| RESET | BOOL |
| ACTION_DONE | BOOL |
| EQUIP_FAULT | BOOL |
| ACT_TMO | TIME |
| ACK | BOOL |
Outputs
| Port | Type |
|---|---|
| STATE | USINT |
| RUNNING | BOOL |
| COMPLETE | BOOL |
| PAUSED | BOOL |
| HELD | BOOL |
| STOPPED | BOOL |
| ABORTED | BOOL |
| SAFE_STATE_REQ | BOOL |
| ACTIVE_PHASE | USINT |
| ALM_ACT_TMO | BOOL |
| ALM_EQUIP_FAULT | BOOL |
| ALM_ILLEGAL_CMD | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
PHASE_LOGIC 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
- 121
- 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 PHASE_LOGIC — 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.