NOVELLUS 02-00374-00 Microcomputer Controller

The running program of NOVELLUS 02-00374-00 ends its work at the specified time, and a work completion signal is issued to clear this timer to zero, indicating that the running program of this object is normal; otherwise, it is running abnormally, and an alarm signal or a shutdown signal is issued. The ladder diagram of the monitoring program is shown in Figure 7. Figure 7 in the timer T1 for the detection element, X001 for the control object action signal, X002 for the completion of the action signal, M2 for the alarm or shutdown signal.

NOVELLUS 02-00374-00 It takes 50s for the running program of the controlled object to complete one cycle, then the value of timer K can be taken as 510 (T1 is a 100ms timer). When X001 = 1, the controlled object running start, T1 start timing; such as in the specified time the controlled object running program can be normal end, then X002 action, M1 reset, timer T1 is cleared, waiting for the start of the next cycle; if in the specified time is not issued by the controlled object to run the completion of the action signal, it is judged to be a fault, the T1 contact closure, connected to the M2 to send out alarm signals or stop signal.