how to write program to find max and min value

[mustaqim90]

hi.

i have a problem. im using omron cx-programmer..how to write the program to find maximum and minimum value in ladder diagram using the formula (tn < tn-1) and (tn > tn-1).

help me..

 

[boneless]

you are trying to compare the current value to a previous value?

 

[Tom Jenkins]

I'm not familiar with Omron, but most PLCs have a greater than and a less than comparison function. Compare the existing min to the new process value, and if the new process value is lower move it to the register for the existing min value. Similar for the max.

At the beginning of a new test period initialize the existing min and max values to the current process values.

 

[osmanmom]

use MAX(182) and MIN(183)

 

[mustaqim90]

you are trying to compare the current value to a previous value?

yup..i wan compare the current value to a previous value..