maggiesparky
Member
hello, i am maggiesparky and have visited this forum many times and just love it. well i have a ladder diagram question and ask for your help to correctly diagram the following scenario:
a n.o. pb will activate 2 pushrods (separate devices). when the pb is pressed pushrod A extends and holds for twenty seconds before returning to home. after returning to home pushrod B extends and holds for twenty seconds. upon returning to home the counter resets and circuit returns to the off state.
the second scenario is a little easier but i still miss the timing aspects: same pb, same pushrods; press pb to extend pushrod A it retracts and there is a twenty second delay before pushrod B extends. after pushrod B retracts the timer restes to zero and circuit remains at rest state (off)
this is the best i understand the question, it is very similar to one that could appear on a test i take soon to become an electrician at the plant where i work.
the proper placement of timers the ton, toff, and res are where i fumble...
thank you loads...for i just might become what i have been wanting to do for near 20 years...and put an old education at devry to work.
thank you again and so very much.
the plc brand is allen bradley, model of controller is rslogix 500/slc-500 instruction set, thank you jtshaffer.
a n.o. pb will activate 2 pushrods (separate devices). when the pb is pressed pushrod A extends and holds for twenty seconds before returning to home. after returning to home pushrod B extends and holds for twenty seconds. upon returning to home the counter resets and circuit returns to the off state.
the second scenario is a little easier but i still miss the timing aspects: same pb, same pushrods; press pb to extend pushrod A it retracts and there is a twenty second delay before pushrod B extends. after pushrod B retracts the timer restes to zero and circuit remains at rest state (off)
this is the best i understand the question, it is very similar to one that could appear on a test i take soon to become an electrician at the plant where i work.
the proper placement of timers the ton, toff, and res are where i fumble...
thank you loads...for i just might become what i have been wanting to do for near 20 years...and put an old education at devry to work.
thank you again and so very much.
the plc brand is allen bradley, model of controller is rslogix 500/slc-500 instruction set, thank you jtshaffer.
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