Write a ladder logic program that will turn on a light if a no push button is pressed 8 times10/23/2023 ![]() Input In 2 is an enabling switch to enable the system to be closed down. Input In 1 and input In 3 are inputs from photoelectric sensors that detect the presence of a person approaching or leaving from either side of the barrier, input In 1 being activated from one side of it and input In 3 from the other. Such a task might be involved in the automatic lifting of a barrier when someone approaches from either side. ![]() ![]() If input In 4 is then activated, there is an output from output Out 1. This results in the contacts for IR 1 closing. ![]() For the first rung, when input In 1 or input In 3 is closed and input In 2 closed, internal relay IR 1 is activated. Figure 7.2 shows a ladder program for such a task.
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