The user program error indicator is installed on the base unit in plc, marked as USER in the Q series indicator and PROG–E in the FX series indicator. This indicator is used to indicate the execution of the PLC user program. When the PLC detects that there is an error in the user program during startup or during operation, the indicator USER or PROG–E will flash. The specific reasons for the error are:
I forgot to set the timer or counter constant, ladder error, abnormal battery voltage drop, or the content of the program memory changes due to abnormal noise, conductive foreign matter, etc., and the LED flashes. In this case, check the program again to check for the presence or absence of conductive foreign matter, whether there is a serious noise source, or the display of the battery voltage.
When an error occurs, the value of one of 8009, 8060 to 8086 is written in the special data register D8004. For example, if the content written is 8064, then look at the contents of D8064 to know the error code. For the actual error content corresponding to the error code, please check the related books.
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