the sequence A;B;A will ALWAYS fail

Hi,

Don’t know if this will help anyone else, however I had a s/o request that I initially said I couldn’t achieve based on the below statement on PLC.

The ordered sequence only looks at the most recent event time. So the sequence A;B;A will ALWAYS fail.

However, with a little playing around, I have noted that the following does work

C1 = A;B C2 = C1;B

With C2 is effectively appearing to work as A;B;A

Although if you then add in

C3 = C2;A

The logic does flow down, however you’ll find that C1 & C3 can go true together, so be careful.

Regards,
David