adccommunitymod (AutomationDirect) asked a question.
D2-250 CPU Comes out of run mode
Created Date: May 15,2006
Created By: gtremblay
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WE have a project in which the D2-250 periodically comes out of the run mode. If the unit is powered down it will power up again in the run mode. Does anyone have a solution for preventing this?
Created Date: May 15,2006
Created by: Tech Guy
Usually this is caused by one of two things.
1) Operator who likes to fiddle with buttons and switches (Run/Term/Stop switch). If it tends to always happen during a particular shift, then this is often the culprit.
2) A CEMF (Counter ElectroMotive Force) spike from inductive devices being switched off or possibly lightening. Use Diodes or MOV's (Metal Oxide Varistors) on all coils and a good surge suppressor for the incoming power to the PLC. Occasionally the spikes com in through the COM ports, but this is fairly rare.
Created Date: May 15,2006
Created by: gtremblay
WE have a project in which the D2-250 periodically comes out of the run mode. If the unit is powered down it will power up again in the run mode. Does anyone have a solution for preventing this?