ASSET_PRESENCE
Asset-tag sweep correlation against the inventory count, with multi-sweep confirmation, undocumented-asset detection, reader watchdog and wrap-safe counts.
When to use it
Use ASSET_PRESENCE when a rack is fitted with an RFID or equivalent asset-tag reader that sweeps periodically, and the tags it sees must be correlated against the count the DCIM inventory says should be there.
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 | — |
| TAGS_SEEN | UDINT | tags |
| SWEEP_DONE | BOOL | — |
| READER_OK | BOOL | — |
| N_EXPECTED | UDINT | tags |
| CONFIRM_SWEEPS | INT | sweeps |
| SWEEP_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| N_TAGS | UDINT | tags |
| MISSING | BOOL | — |
| N_MISSING | UDINT | tags |
| N_EXTRA | UDINT | tags |
| SHORT_SWEEPS | UDINT | sweeps |
| VALID | BOOL | — |
| ALM_MISSING | BOOL | — |
| ALM_EXTRA | BOOL | — |
| ALM_READER_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 12
- Simulated scans
- 91
- 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 ASSET_PRESENCE — free
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