CHECKWEIGH_CTRL
In-line checkweigher with two-sided limit check, drift statistics and a consecutive-reject line stop.
When to use it
Use CHECKWEIGH_CTRL when every container passes over a dynamic checkweigher after filling or packing, each one has to be judged against a minimum AND a maximum weight, and a run of rejects has to stop the line rather than fill a reject bin.
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 | — |
| REQ | BOOL | — |
| WEIGHT | REAL | g |
| WT_OK | BOOL | — |
| MIN_G | REAL | g |
| MAX_G | REAL | g |
| ALPHA_PCT | REAL | % |
| CONSEC_LIM | USINT | — |
| REJ_PULSE_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| IN_SPEC | BOOL | — |
| REJECTS | UDINT | — |
| PASSES | UDINT | — |
| UNDER | BOOL | — |
| OVER | BOOL | — |
| VALID | BOOL | — |
| CNF | BOOL | — |
| REJECT | BOOL | — |
| REJ_DEMAND | BOOL | — |
| MEAN_G | REAL | g |
| SPREAD_G | REAL | g |
| REJECT_RATE_PCT | REAL | % |
| CONSEC_FAILS | USINT | — |
| ALM_CONSEC_REJ | BOOL | — |
| ALM_WT_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| LINE_PERMIT | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 8
- Simulated scans
- 51
- 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 CHECKWEIGH_CTRL — 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.