2. With reference to the ladder logic of the CLx di verter gate program (Figure

Question

2. With reference to the ladder logic of the CLx di verter gate program (Figure 15-53), assume the solenoid gate fails to energize as programmed. You suspect the problem is due to an open in the solenoid coil or wiring to it. How might observation of the so- lenoid output status light help confirm this? 3. You are required to extend the Green light-on time of the CLX traffic control program (Figure 15-55) to 40 seconds. What changes would have to be made to the program? 4. With reference to the CLX heating oven process pro- gram (Figure 15-59), assume the oven-on pilot light burns out. In what way would the operation of the program be affected?

Explanation / Answer

In the plac there are tini led lights for every input/output. When that input/output is energized in the program the status led lights also turn on, irrespective of the fact that outer wiring is having a defect.

So if you have energized the sol. Sensor at input, then the timer will start and after preset time the output sol. Gate will be on.

If there is some defect in solenoid wiring, then the solenoid will not work or turn on. Only the status light in plc turn on.

The status bit of sol. Gate will also set to 1.

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