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My Series 90 CPU stopped. How do I identify the cause?

November 28th, 2018

Take note of the LEDs on the power supply and the CPU. Key LEDs are the POWER LED (power supply health) and the OK LED (CPU health).If these are OK, use one of the available programming packages (Logicmaster 90, VersaPro or Proficy Machine Edition Logic Developer PLC), connect to the Series 90’s programming port and display the PLC and I/O fault tables. These should lead you to the root cause of the stoppage. Please note that if the CPU’s OK LED is out, the software will not communicate.

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