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Automatic control function programming manual ladder language

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Example<br />

5.2.2.6 Branches<br />

It is possible to branch adjacent rungs.<br />

A branch is shown as a vertical bar after a contact or rung.<br />

5.2.2.7 Execution of a Test Zone<br />

The test zone is scanned from top to bottom and from left to right.<br />

On a rung, the potential propagates from left to right and never from right to left (contrary to a circuit diagram where<br />

propagation can be in both directions).<br />

On a branch, propagation is from bottom to top and top to bottom.<br />

5 - 14 en-938846/3

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