1. If the PLC stops in the middle of some outputs where the output is excited, then look for the signal that caused the next operation (input, timer, line, drum manipulator, etc.). The programmer will show the ON/OFF status of that signal.
2. If the input signal is compared with the LED indication of the input module, and the result is inconsistent, the input module will be replaced. If you find that there are multiple modules to be replaced in the expansion fabric, you should check the I/O expansion cable and its connection status before you replace the module.
3. If the input status is consistent with the LED indication of the input module, compare the status of the LED and the input device (button, limit switch, etc.). If there is a problem, you need to replace the I/O equipment, field wiring or power supply; Otherwise, replace the input module.
4. If the signal is line, there is no output or the output is different from the condition of line, you have to use the programmer to check the output driving logic and check the program list. The view should be carried out from there to left, find out the first contact that is not connected, if the one that is not connected is the input, press the second and third steps to view the input point, if it is a line, press the fourth and fifth steps to view. Acknowledging that making the master relay step affects the logic operation.
5. If the signal is a timer and stops at a non-zero value less than 999.9, the CPU module should be replaced.
6. If the signal controls a counter, first check the logic of the control reset, then the counter signal. Follow steps 2 to 5 above.
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