George Z Posted March 14, 2012 Report Share Posted March 14, 2012 Got a black screen this morning on my 570 PLC - listed COM1 and COM2 and their configuration along with a third line saying "Expansion Pack Error". Restarted the unit but I don't seen to have any inputs. Is there anything further I can do to debug this or do I just have to replace the I/O module? Thanks, George Link to comment Share on other sites More sharing options...
Emil Posted March 14, 2012 Report Share Posted March 14, 2012 It seems you have broken connection between the expansion adapter and the controller. As first step check the expansion cable connection and its grounding. On which side is the ground wire of this cable - PLC or expansion adapter? Wow it's connected? Link to comment Share on other sites More sharing options...
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