![]() There is a slight delay between the change in inputs and the resulting changes in outputs, due to the program scan time. Here when input A turns on both the outputs turn on. For example the value of input A starts low (false) and becomes high (true) for a short while, and then goes low again. The operation of the ladder logic in Figure 1 is illustrated with a timing diagram in Figure 2.Ī timing diagram shows values of inputs and outputs over time. If an output has been latched on, it will keep its value, even if the power has been turned off.
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