Schneider PLC, PWR constant, RUN, ERR red light, STAT flashing at the same time, RUN is always on, and there is signal input but no output during operation. What's the problem?

Judging from what you said, it is not certain that there is a problem with PLC. My analysis is PLC or normal, but the output will not act because a condition in the program does not meet the conditions. It is recommended that you consider:

1. Have you paid the final payment for the equipment?

2. Is the key input signal normal? Like some signals that must be normally closed: emergency stop, limit switch and so on.