TOF
Off-delay timer — Q follows IN TRUE at once and holds TRUE for PT after IN falls.
When to use it
Use TOF when an output must persist after its condition clears — a run-on fan, a lubrication overrun, holding an alarm visible long enough to be seen.
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 |
|---|---|
| IN | BOOL |
| PT | TIME |
Outputs
| Port | Type |
|---|---|
| Q | BOOL |
| ET | TIME |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 4
- Simulated scans
- 40
- 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 TOF — 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.