Symbol: 
The element is available in the LD and FBD editor and represents an open branch. A branch splits the processing line from the current cursor position onwards into two subnetworks which are executed in succession from top to bottom. You can further branch each subnetwork which results in multiple branches being created within a network.
Each subnetwork is given a marker symbol (rectangle) at the branch point, which you can select in order to execute further commands.
The “Copy”, “Cut”, and “Paste” commands are not available for subnetworks.
To delete a subnetwork, you first have to delete all elements of the network and then the marker symbol of the subnetwork.
For more information, see:
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Command: ⮫ “Command: Insert Branch ”
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Command: ⮫ “Command: Insert Branch Above ”
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Command: ⮫ “Command: Insert Branch Below ”