Mitsubishi PLC comparison function

[m.rahmy]

i want to know the role of M2 is to enable the comparison function or it's anded  with the output of the function. in another words if M2 is true and the output of the function is true then M3 is true, but what if M2  becoms false if it's anded with the output of the function then M3 is false , but if M2 stops the execution of the function M3 will remain true, so i need to know if it controllers the execution or it's just anded.  

Edited May 4, 2020 by m.rahmy

[Thiago Turcato]

It's ANDed, so any of the conditions in your ladder line goes false, M3 goes false, as well.

Regards!

[panic mode]

note that coil instruction either sets and resets assigned memory location - every time it is scanned.

output is true if condition is true (in this case it is ANDed) but if condition is not true, output will get reset as in this pseudo code example:

 

IF (M2==TRUE) AND (D1 == 0) THEN

    M3 = TRUE

ELSE

   M3= FALSE

ENDIF