Chapter 15 PID Function (Built-in function)
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5) If auto-tuning is complete or there is any error during auto-tuning, M0001 junction is set,
blocking operation of PIDAT command and it outputs min. MV set in parameter to D/A
output module.
(c) Monitoring and changing PID control variables using K area
In XGB series built-in auto-tuning, it can monitor and change RUN status of auto-tuning by
using K area allocated as fixed area by loops.
1) Variable registration
If selecting “Register in Variable/Description” by right clicking in the variable monitor
window, “Variable/Device Selection” window appears. Select “Item” as PID, deselect
“View All” and enter 0(means loop number) in “Parameter No”, K area device list to save
every setting and status of loop 0 appears as shown Figure 15.22. Then, if selecting a
variable to monitor and clicking “OK”, a selected device is registered to variable monitor
window as illustrated in Figure 15.23. Through the monitor window, a user can monitor
auto-tuning run status or change the settings.
[Figure 15.22 Variable registration window]
[Figure 15.23 Auto-tuning variables registered]
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