CHECKWEIGHER_FB
Dynamic checkweigher with giveaway tracking and average-quantity (e-mark) T1/T2 accounting.
When to use it
Use CHECKWEIGHER_FB when every pack is weighed in motion, packs outside the acceptance window must be rejected, and the batch has to satisfy the three average-quantity rules as well as the machine's own high and low limits.
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 | — |
| SAMPLE | BOOL | — |
| WEIGHT | REAL | g |
| TARE | REAL | g |
| MIN_G | REAL | g |
| MAX_G | REAL | g |
| NOMINAL_G | REAL | g |
| TNE_G | REAL | g |
| FS_G | REAL | g |
| T1_MAX_PCT | REAL | % |
| MIN_BATCH | UDINT | — |
| WT_OK | BOOL | — |
| RESET_BATCH | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| NET_G | REAL | g |
| IN_SPEC | BOOL | — |
| REJECT | BOOL | — |
| GIVEAWAY_PCT | REAL | % |
| GIVEAWAY_TOT_G | REAL | g |
| AVG_G | REAL | g |
| T1_PCT | REAL | % |
| PACKS | UDINT | — |
| T1_UNDER | UDINT | — |
| T2_UNDER | UDINT | — |
| VALID | BOOL | — |
| ALM_T2_UNDER | BOOL | — |
| ALM_T1_RATE | BOOL | — |
| ALM_AVG_LOW | BOOL | — |
| ALM_WT_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 9
- Simulated scans
- 55
- 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 CHECKWEIGHER_FB — 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.