Creating functions in S7

WilsonNC

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Dec 2010
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I want to create some functions that will return boolean values if conditions are met. For example I have a high and low limit, and then then input. My block has 3 input variables. I called them low limit, high limit and input. The output is boolean and is called "passed"

My function works when I insert it in a rung. However is it not possible to add another block or boolean operator after my function is inserted on the same net? I would like to compare some values, if true look at some vore values, set a bit....
 
WilsonNC said:
I want to create some functions that will return boolean values if conditions are met. For example I have a high and low limit, and then then input. My block has 3 input variables. I called them low limit, high limit and input. The output is boolean and is called "passed"

My function works when I insert it in a rung. However is it not possible to add another block or boolean operator after my function is inserted on the same net? I would like to compare some values, if true look at some vore values, set a bit....
Click to expand...


you need set save at the end of your function before exiting to enable the segment to continue after its call.
 
You have two alternatives, either always make the ENO from the FC true and then use the boolean return value with contacts between the blocks, or use the ENO mechanism. Here is an example of both methods:

save001.jpg
 
I used my local variable #passed in a second net in the function as a N/O contact. The output was SAVE. Will this work, or is there a better way?
 
WilsonNC said:
I used my local variable #passed in a second net in the function as a N/O contact. The output was SAVE. Will this work, or is there a better way?
Click to expand...

It will work if your aim is to not continue on the network on retuirn where you comparrison did not pass.
 
After the '=' the RLO condition depends on the logic.

The 'SET' forces the RLO to '1' independant of the preceding logic.
 
Its just an example showing you it will continue regardless if SET SAVE is used and showing an output can be used to continue if required.
 

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