Peter Quiring
Member
In Siemens Step7 Ladder Logic if there is a branch, which direction does the PLC go first? I'm assuming down. Is that correct?
Step7 ladder logic branch selection
- Thread starter Peter Quiring
- Start date
In general left to right, top to bottom is the rule, but things can get tricky when there is complex branching. I've seen cases where the bottom rung in a branch went before the top.
The easiest way to see what will happen for sure (if using a 300/400) is to look at the LAD in STL. That requires a bit more complex knowledge to parse, but STL is (ignoring jump commands) always top to bottom and linear.
The easiest way to see what will happen for sure (if using a 300/400) is to look at the LAD in STL. That requires a bit more complex knowledge to parse, but STL is (ignoring jump commands) always top to bottom and linear.
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