HEARTBEAT
Liveness beacon — a toggling output a supervisor watches to prove this controller is still scanning.
When to use it
Use HEARTBEAT when a SCADA master, a redundant partner or a remote skid has to be able to tell that this controller is still executing, not merely still answering on the network.
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 |
|---|---|
| PERIOD | TIME |
Outputs
| Port | Type |
|---|---|
| ALIVE | BOOL |
| COUNT | DINT |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 4
- Simulated scans
- 57
- 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 HEARTBEAT — 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.