Alternating two motors - PLCS.net

Clint63 · March 17th, 2018, 06:59 PM

Hi I'm kinda new at PLC programming sorta teaching myself. I need to alternate between two motors run one till satisfied the when it calls again run the other back and forth. Thanks Clint

Steve Bailey · March 17th, 2018, 07:27 PM

Many ways to do it. Search the forum using the key word "flip-flop" for some ideas.
A simple method is to increment a counter every time either motor starts. When the value of the counter's accumulator is even start pump A, if odd start pump B. The least significant bit of the accumulator is true for odd numbers, false for even numbers.

mendonsy · March 17th, 2018, 09:28 PM

The other thing you need to consider is what to do if one pump is not available or doesn't start. There needs to be some alternate method for starting the other pump in an emergency.

March 17th, 2018, 06:59 PM	#1
Clint63 Member Join Date: Mar 2018 Location: MO Posts: 1	Alternating two motors Hi I'm kinda new at PLC programming sorta teaching myself. I need to alternate between two motors run one till satisfied the when it calls again run the other back and forth. Thanks Clint

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March 17th, 2018, 07:27 PM	#2
Steve Bailey Lifetime Supporting Member + Moderator Join Date: Apr 2002 Location: The boondocks of Western Massachusetts USA Posts: 6,631	Many ways to do it. Search the forum using the key word "flip-flop" for some ideas. A simple method is to increment a counter every time either motor starts. When the value of the counter's accumulator is even start pump A, if odd start pump B. The least significant bit of the accumulator is true for odd numbers, false for even numbers.

March 17th, 2018, 09:28 PM	#3
mendonsy Member Join Date: Feb 2009 Location: Western NY Posts: 745	The other thing you need to consider is what to do if one pump is not available or doesn't start. There needs to be some alternate method for starting the other pump in an emergency.

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