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Why must an output be addressed only once in an output position in a plc?
Wiki User
∙ 16y ago
I am sure that you realize that all of the conditions on the rung containing the output instruction must be true for the output to come on. Let's assume that they are and the output is energized. If the program encounters another rung with the same output addressed, but the rung evaluates false, it is then turned off. I hope that you can see that the addressed bit could be turned on and then back off during the same scan. If there are multiple conditions to turn on a particular output bit, use branches on the rung, or write multiple rungs to turn on internal bits that can then be relayed to the rung containing the output device address. I hope that this helps!
Wiki User
∙ 16y ago
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