U_SPACE_TRACK
Rack U-space occupancy tracker with edge-driven installs and removals, reserved space, refused-fit latching and wrap-safe unsigned arithmetic.
When to use it
Use U_SPACE_TRACK when rack elevation is maintained in the controls layer rather than only in a spreadsheet — a colocation cage, a modular or containerised deployment, or any site where the install/remove workflow raises a signal the PLC can see.
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 | — |
| U_TOTAL | USINT | U |
| U_SIZE | USINT | U |
| ADD | BOOL | — |
| REMOVE | BOOL | — |
| SET_CMD | BOOL | — |
| U_SET | USINT | U |
| U_RESERVED | USINT | U |
| FULL_PCT | REAL | % |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| U_USED | USINT | U |
| U_FREE | USINT | U |
| U_AVAIL | USINT | U |
| OCC_PCT | REAL | % |
| ALM_FULL | BOOL | — |
| ALM_REJECTED | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Validation evidence
- Tests
- 10
- Simulated scans
- 95
- 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 U_SPACE_TRACK — 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.
Every block in the catalogue is free to download, in every format it ships, with no purchase and no card. Browsing needs no account at all; downloading needs a signed-in one, so the block lands in your library and re-downloads whenever you need it.
Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.