Have a Simodrive 611 talking to an Acramatic 2100 thru the Profibis DP. All bootup without errors. When START is pressed to bring on drives we get message "NCA Simodrive 611 power module fault"; however all druves show green LED and display the "run" condition with no faults. Have you seen this problem before? Any idea what we are missing or how to determine which amplifier is at fault?