AC500-pm554 cpu's run,power,fault leds light up at same time when power up.
i have a pm554 cpu.i have downloaded my program to cpu.it was working,didnt have a problem.but a few days later,i noticed its run,power,error leds was lighting up same time.Then i powered down and up supply of cpu,suddenly the three led light up again .
i repeated this process but i had no solution.i cant reach to plc by ethernet port also.
i encountered same problem before.How can i solve this problem.
Thanks for your help....
The flashing LED is just a signal that something is wrong in the cpu. In order to do a diagnosis it is necessary to connect to the cpu with the developer tool, in this case Automation Builder and go to see the cause of the error in the diagnostic page.
You can also use the TK 503 cable to connect PC to the CPU.
Hope this help you