ISPSoft User Manual Communication Loading of Scan Time When enabled, users can adjust communication loading of scan time. (ONLY AH5x1 and AH560 redundant system series supports this function.) Watchdog Timeout Users can set a timeout during which the program is scanned. Generally speaking, the watchdog timeout is reset whenever the scan of the program is complete. If the scan procedure cannot be completed within the time set for some reason, the watchdog timeout occurs, and the CPU module will be in an erroneous condition. Please refer to operation manuals for more information about troubleshooting.
Enable Constant Scan Users can select the Enable Constant Scan checkbox, and set a scan time. If the actual scan time is less than setting value, the CPU module will not carry out the next scan until the setting value is reached. If the actual scan time is larger than the setting value, the CPU module will ignore the setting value, and operate according to the actual scan time. Besides, if the scan time set is larger than the watchdog timeout set, a watchdog timeout occurs when the CPU module operates. Interval Interrupt Time An AH500 series CPU module provides four interrupts. Users can set intervals of triggering the interrupts.
In ISPSoft, a timed interrupt is created through a task and a POU. Please refer to chapter 5 for more information. 3-164