adccommunitymod (AutomationDirect) asked a question.
DL06 Bad Outputs
Created Date: December 15,2012
Created By: trevorstripling
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If an output is over loaded and fails does it fail "ON " or "OFF "?
Created Date: December 15,2012
Created by: johnaden
Is the output Relay, AC or DC ?
Created Date: December 15,2012
Created by: trevorstripling
Is the output Relay, AC or DC ?
Sorry, DC it is a D0-06DD2-D.
Created Date: December 16,2012
Created by: dieseltwitch
Some one correct me if Im wrong but an out put will fail in the off position, there is a chance that a relay module may fail on but it would be vary rare.
Do you have a life safety setup you are concerned about?
Created Date: December 16,2012
Created by: bcarlton
I 've seen DC (transistor) outputs fail either way (open or shorted). That's why we wire some limit switches to kill the movement independent of the PLC execution if continued motion could cause damage.
Created Date: December 16,2012
Created by: pressgrove
We do something similar to what Bernie mentioned. We group the outputs so that movements using multiple outputs share the same common. We then route the common through a limit switch, safety relay, etc en route to the output card.
I usually end up with several different output common "types ". Some are switched with the e-stop circuit, some go through additional safety devices, some (like alarm horns, beacons, etc) are hot any time there is control power.
Created Date: December 15,2012
Created by: trevorstripling
If an output is over loaded and fails does it fail "ON " or "OFF "?