One of our petblowing full automatic machines just switched off the heater line during operation and I traced out that there was no signal from PLC, so I switched off the machine and latter switch-ON. When the machine was switched-ON, the interface board, though, have its 22vdc instead of 24vdc but doesn't ON/operate. That is why I went to check the PLC and i find out that the PLC was showing "program error" light. Pls what can i do?
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