error in ac500 eco plc
An ac500 eco series plc installed in a machine shows error light and stops the pgm frequently (2 or 3 times a day) and goes off by doing power cycle . is there any way to read the error after power cycle ? i ve checked the configuration and all modules are set to run even in configuration fault . the PLC_PGM is set to run normally , (i.e) not assigned to run cyclic in task configuration .
size of used data:19.89%
size of retain data:3.71%
code size:9166 bytes
please anyone suggest possible reason for the error if possible.
Voted best answer
The reason for the program stopping frequently as per my experience is inadequate cycle time. In the event of PLC_PRG not being assigned to a task of type cyclic, the control builder software, by default, assigns a task to PLC_PRG and schedules the task with a cycle time of 10ms.This cycle time may be insufficient. If the execution time becomes greater than or equal to the cycle time, the CPU load tends to exceed 100% and the program execution eventually stops, due to CPU overload.
In order to prevent this, I suggest you to append PLC_PRG to a cyclic task, with a cycle time of 200ms (a lower value can also be set, based on CPU load/time constants of the process being controlled) and then download the program onto the PLC.
ABB products commissioning engineer
you can read in Automation Builder --> select by mouse the cpu --> login --> edit
In the right window of your screen you can read errors and check the error number by help, acknoledge the errors or delete the errors.
If the program was compiled without errors, during cycle the error could be happen for example by a bad contacts in I/O bus....and other reasons.
Hope this help you