ISO_MON
DC insulation and residual-current monitoring with a voltage-proportional requirement, latched trips and a pre-energisation permissive.
When to use it
Use ISO_MON when a DC charging point must prove the insulation resistance between its DC conductors and earth before it energises, and keep watching it — together with the residual current — for as long as the contactors are closed.
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 | — |
| R_ISO_RAW | REAL | kohm |
| IMD_OK | BOOL | — |
| RES_CURRENT_RAW | REAL | mA |
| RCM_OK | BOOL | — |
| R_MIN | REAL | kohm |
| DC_LINK_V | REAL | V |
| OHMS_PER_V | REAL | ohm/V |
| RC_LIMIT | REAL | mA |
| TRIP_DLY | TIME | — |
| STABLE_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| R_ISO | REAL | kohm |
| RES_CURRENT | REAL | mA |
| INSUL_OK | BOOL | — |
| START_OK | BOOL | — |
| R_REQ | REAL | kohm |
| R_ISO_VALID | BOOL | — |
| R_ISO_MIN | REAL | kohm |
| ALM_ISO_TRIP | BOOL | — |
| ALM_RC_TRIP | BOOL | — |
| ALM_IMD_FAULT | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
ISO_MON 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
- 8
- Simulated scans
- 139
- 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 ISO_MON — 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.