Topic: Electrical Control Pneumatic Cylinder: Auxiliary State. Explain how the t

Question

Topic: Electrical Control Pneumatic Cylinder: Auxiliary State.

Explain how the two circuit work?

Lab4 Electrical Control Pneumatic Cylinder: Auxiliary State 2 1 Objective: Learn to use auxiliary state to help to control pneumatic cylinder. Requirements for Design esign ladder diagram to control two cylinders as shown in Figure 1, Piston position cylinder2 LS2 cylinder1 LS4 LS1 LS3 LS4 LS3 time LS2 2 Start End cycle 4 SW time 5 3 LS1 Auxiliary state Figure 1 Timing diagram and pneumatic circuit of design 0 1 LS4 AND S 10 LS2 AND S

Explanation / Answer

The process has 2 actuators: A solenoid and B solenoid, which respectively control the pneumatic direction control valves for the extension and retraction of the piston. The process also has 2 sensors: an upper limit switch i.e. LS4 and LS2 that indicates when the piston is fully retracted and a lower limit switch i.e. LS1 and LS3 that indicates when the piston is fully extended. The whole process has a master switch START which is used to start the process. The auxillary switch S is defined such that when LS1 is 1 and S=1 then, S=0. Also, when LS4=1 and S=0 then, S=1.

The PLC has 3 inputs, 2 from the limit sensors and 1 from the startswitch; and controls 2 outputs, 1 to each actuator solenoid.

Now, when LS1 and LS3 ie both lower sensor are 1 then we should turn the auxillary contact relay A ie up solenoid of pnematic. Wait till the aux S is 1 because by that time, LS4 of B would be 1. Then, we can energies the relay B.

NOTE, when S=0, LS2 and LS3 decides the output Aand B. However, when S=1. then to energies or denergies relay A, LS3 would be taken care of. But, when S=1. then to energies or denergies relay B, LS4 would be taken care of.

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