10. Consider implemented in a PLC. the hard-wired relay control diagram shown be

Question

10. Consider implemented in a PLC. the hard-wired relay control diagram shown below that could be L1 120 V ac Pressuro omperaturo OL swinch Motor col Manual a) Which of the devices above would be connected to a PLC INPUT module? b.) Which of the devices above would be connected to a PLC OUTPUT module? c.) Which of the devices above are NC? d.) Being as specific as possible, what logic energizes the motor start ccil? Use the terms "open and ciosed to describe the inputs rather than on and "off 11. Answer the following questions about the ladder program shown below. Assume all inputs connected are normally open. HEAT COIL RUN SWITCH DISCHARGE PUPTXP S STR MOTOR

Explanation / Answer

a) Devices connected to PLC Input module are:
1)Pressure Switch
2)Temparature Switch
3)Manual Push button
Reason: As all above 3 devices recieve controll signal and act as input to control motor

b)Device connected to PLC Output module is:
   1)Motor Starter coil
Reason: Motor starter coil will get controlled as per inputs PLC will receive

c)NC Devices are
   1)Pressure switch
2)Motor Starter coil

d)Following Logic will energies motor starter coil
   1)When either temparature switch is closed or Manual Push Button is closed
2)When both temparature switch and Manual Push Button are closed

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