RATE_LIMIT
Slew-rate limiter with separate rise and fall rates, first-scan initialisation onto the live signal, and a limiting flag.
When to use it
Use RATE_LIMIT when a signal is allowed to reach any value but not to get there quickly — an EV charger's current limit, a chiller's load setpoint, a burner's firing rate, a genset's load ramp, any command feeding equipment with a mechanical or thermal rate limit.
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 |
| MAX_RATE | REAL | eng. units/s |
| CYCLE | TIME | — |
| MAX_RATE_DN | REAL | eng. units/s |
| IN_OK | BOOL | — |
| RESET | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| OUT | REAL | eng. units |
| LIMITING | BOOL | — |
| VALID | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 9
- Simulated scans
- 221
- 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 RATE_LIMIT — 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.