LEAD_LAG
Lead-lag dynamic compensator with unity steady-state gain and output limits on the transient.
When to use it
Use LEAD_LAG when a feed-forward or ratio signal has to be matched to the dynamics of the process it is compensating — combustion air leading fuel, makeup leading blowdown, a chilled-water reset leading the load it anticipates.
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 | Unit |
|---|---|---|
| IN | REAL | eng. units |
| T_LEAD | TIME | — |
| T_LAG | TIME | — |
| CYCLE | TIME | — |
| OUT_MIN | REAL | eng. units |
| OUT_MAX | REAL | eng. units |
| IN_OK | BOOL | — |
| RESET | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| OUT | REAL | eng. units |
| LIMITED | BOOL | — |
| VALID | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 9
- Simulated scans
- 1190
- 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 LEAD_LAG — 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.