DR_EVENT_HANDLER
Demand-response event state machine: start/end signalling, ramped curtailment target, countdown, opt-out, and a fail-safe on the VTN link.
When to use it
Use DR_EVENT_HANDLER when a site acts as an OpenADR (or equivalent) virtual end node, and the decoded event a comms driver hands the PLC has to be turned into a curtailment target the plant can actually follow — with an opt-out and a link failure that releases rather than sticks.
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 |
|---|---|---|
| ENABLE | BOOL | — |
| PARAMS | STRING | — |
| COMMS_OK | BOOL | — |
| EVENT_PENDING | BOOL | — |
| EVENT_ID_IN | STRING | — |
| EVENT_TARGET_KW | REAL | kW |
| EVENT_DURATION | TIME | — |
| OPT_OUT | BOOL | — |
| RAMP_S | REAL | s |
| MAX_TARGET_KW | REAL | kW |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| EVENT_ID | STRING | — |
| TARGET_KW | REAL | kW |
| MINUTES_LEFT | REAL | min |
| EVENT_ACTIVE | BOOL | — |
| EVENT_START | BOOL | — |
| EVENT_END | BOOL | — |
| OPTED_OUT | BOOL | — |
| ID_VALID | BOOL | — |
| ALM_COMMS_FAIL | BOOL | — |
| ALM_OVER_REQUEST | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Supervised control write
DR_EVENT_HANDLER 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
- 732
- 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
Download DR_EVENT_HANDLER — 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 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.