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Cliff T.

trying to examine state of sensor

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I am trying to examine a proximity sensor during acceleration: what I am trying to accomplish is "during acceleration if there is no change in state to the poximity sensor (either stays high or low depending on last cycle) then initiate shutdown. What I am currently getting is "as soon as acceleration starts shut down". I am not sure how to examine the state of the input for

"no change" and am wondering if anyone might have some insight as to how to accomplish this? I am using an EZ420 PLC/HMI Hopefully a screenshot of my current logic (reference rungs 7-12) is attached. Thanks in advance!

accel.JPG

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Never used that specific product but here are some ideas...

detect change.png

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of course one and flip the Bit1 to change logic from XOR to EQ

 

detect no change.png

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