Minimizing OR function

[Jinx]

Hi, I have a program where the output stays on through a shift register sequence of m coils from m800 to m816 but they have programmed each m coil as an OR function holding the output on.

I am in the middle of adding new OR functions to hold output on in seperate machine sequence but im having an error 'OVER THE EDIT RANGE'

How do i create an input for example [=>m801 =<m8016] (stay on from m801 to m816)

I am using Q series PLC

[zubair136]

can you share your program picture

[sczot]

hello,

something like this?

if it doesn't help would you share your SW or important parts of it?

[Jinx]

hi Scot,

Like the above but im using simple ladder format.

The NE function block im assuming is not equals.. so in ladder format i would write [<> k4m801]

[Jinx]

[Sergei Troizky]

The complete instruction would be: <> K4M801 H0

[Jinx]

what does the H0 mean?

[sczot]

its zero, you have to compare value from K4M801 against something

Edited October 4, 2018 by sczot

[Jinx]

thats a great help. thank you all. i have managed to write the the input in that configuration. i will test it on my machine today.

 

 

[WattUp]

The above will work, but just to give you more options.. I have been a fan of the NOT-NOT style rungs for large groups of OR.

 

|/A|---|/B|---|/C|---|/D|---|/E|---|/F|---|/G|---|/H|---/----(OUT)

[kaare_t]

Since people are offering multiple solutions to the same problem, I might as well also throw in the following:

If you have a lot of bits (or in some cases words) in series that needs comparing with a "binary" output state you can also look into a FOR-NEXT loop. Just compare one device in each loop and trigger a flag that states if one (or more) have been triggered as either true or false.

In some cases this is more efficient.