Content
# CCSD_CommFault_Tag_Reference.docx
> [Open in Google Drive](https://drive.google.com/file/d/1zoWCRLkNSiiOk2Ync6dMbwtY_xgcO-MP/view)
The document details the CCSD Water SCADA Communication Fault Detection System implemented in a PLC using Studio 5000. It covers the monitoring of nine Opto22 remote I/O chassis via Modbus TCP through a ProSoft gateway, including tag structures (M_PC UDT), error counting, timer preset loading, and logic routines for detecting communication failures and stale data. The system tracks communication health, error codes, and daily error rates to support alarms and diagnostics for remote site communications.