It’s the arrangement of permissive bits or contacts into a Boolean expression that determines whether an output should be ON or OFF. Pretty simple, right? And in its very basic form, that’s what Ladder Logic is. The option you choose is dependent on your application and on how the system is expected to perform. In this case, the door opening or the motion detection will trigger the alarm. ![]() With the OR gate, the inputs are wired in parallel and only one of the conditions is needed. The door will have to be opened and the motion detector tripped before the alarm is triggered. When wired in series, as with the AND gate, both conditions will have to be met before the alarm is activated. ![]() ![]() To equate this to a control circuit, let’s say Input A and Input B (often referred to as permissive bits) are the Door Open and Motion Detected inputs of a home alarm system.
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