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Very Basic Ladder Logic Question


Paul11

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Hi,

I was a very basic ladder logic question. At the moment I can only force on outputs on from the  PLC . My latches do not seem to be working correctly. When I activate the start pushbutton when in online mode the  green light output is not activated. I know the output works when forced the output to a 1 the green light turns on. 

Sorry total new to PLC programming and just trying to get to a handle of it.

Any help at all would be great.

Thanks, 

 

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Do you have power flow all the way to the "Automode" coil when in online mode (i.e. are "Auto_Selector_5", "Stop_2_PB", "Emergency Stop" all closed and "F1_Overload" open)? Is "Start_1_PB closing?

Is this in a subroutine? If so, is it being called in the Main Routine?

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1 hour ago, Flex727 said:

Do you have power flow all the way to the "Automode" coil when in online mode (i.e. are "Auto_Selector_5", "Stop_2_PB", "Emergency Stop" all closed and "F1_Overload" open)? Is "Start_1_PB closing?

Is this in a subroutine? If so, is it being called in the Main Routine?

Hi, thanks for your help,

I have power all the way to the coil but it's not activating.  Should automode that is in parallel with start_pb be an internal bit or a output. I have it as a an global tag. It is the main routine.

Again thanks for the help,

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