Pro-face ERR-215: Pro-face GP4000 Series Error Code ERR-215

Symptoms

The HMI displays ### or ---- for a numeric tag instead of the actual value. The tag quality shows Bad or Uncertain.

PLC tag address changed after program modification without updating the HMI project
Tag data type mismatch between PLC and HMI (e.g., Int vs. Real)
Tag addressing mode set incorrectly (e.g., symbolic vs. absolute)
PLC communication driver incompatible with the tag addressing scheme

Step 1: Verify the tag address in the PLC program matches the HMI tag configuration
Update the HMI project if the PLC tag address has changed
Step 2: Check that the tag data types match between PLC and HMI
Convert the tag type in the HMI project to match the PLC definition
Step 3: Verify the addressing mode: symbolic (named) or absolute (address-based)
Switch modes in the HMI driver settings to match the PLC configuration
Step 4: Test the tag by forcing a known value in the PLC and observing the HMI display
If the forced value displays correctly, the addressing is fixed

Reset: The tag value displays normally once the addressing is corrected and the project is re-downloaded.

Q: Why does my tag show ###?
The value exceeds the display format width, or the tag quality is Bad. Check the numeric format and PLC communication.
Q: What is tag quality?
An OPC concept indicating data reliability: Good (valid), Bad (no data), or Uncertain (stale or questionable).
Q: How do I change the tag data type?
In the HMI configuration software, open the tag properties and select the correct type. Redownload the project to the HMI.