Abstract: The process automation control system L2 of an aluminum zinc plating production line was

explored. In response to potential production faults on the production line，a process data control module of the

process automation control system was provided. Through the analysis of process data，the fault location of the strip steel or production line was analyzed. Finally，a quick method for finding the fault location was provided. The

actual operation shows that this method is stable，reliable，and meets the control needs of actual production.

      Key words: automation control；process data；fault diagnosis