s7 300 move instruction

nick1983 · Apr 11, 2017

Hi all

I currently have a system where data is scanned into a system and in the fc is a move instruction which I move a '00' on the input and move it to a db98.dbw14 for example. I was wondering if the input can contain lets say 2 pieces of data in a sort of an OR case so its either '00' or '01' for example

Many thanks

mk42 · Apr 11, 2017

nick1983 said:
Hi all

I currently have a system where data is scanned into a system and in the fc is a move instruction which I move a '00' on the input and move it to a db98.dbw14 for example. I was wondering if the input can contain lets say 2 pieces of data in a sort of an OR case so its either '00' or '01' for example

Many thanks

You could have 3 inputs in your FC:
1)in1 ("00")
2)in2 ("01")
3)decisionbit (true/false)

If input 3 is true, move in1, if it is false, move in2.

It might be easier to do that logic on the outside of the FC though. Just make it the rung above the FC call.

cardosocea · Apr 11, 2017

- Create a temp variable, let's say T_var

- Create the condition logic before calling the MOV block.
A Bit
JC cond:
L 00
T db98.dbw14
JU mov
cond: NOP 0
L 01
T db98.dbw14

mov: NOP 0

Call MOV ...

s7 300 move instruction

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