An automated production line monitoring system is presented to provide; setting and control of process parameters necessary to operate the various automated processing machine units installed on the line; and surveillance of abnormalities which may occur in the line. The line operator, working in a centralized CRT display and control center, monitors CRT screens showing: an operational preparation display consisting mostly of output signals from various sensors; an operational mode display showing a table of control switches; an interlock display showing various interlocked machine units; a product-type display showing processing steps to be performed on current product; an abnormality list display showing causes of various abnormalities on the line; a status display showing the operating conditions of various machine units; step monitor display showing the sequential step numbers of a production cycle; unit stepping display showing the details of the respective steps shown in the unit stepping display. The operator is able to control the operation of the entire line from the monitoring center by examining relevant displays and rapidly identifying causes of problems on the CRT screen.