Chapter 4 Manufacturing Process Control and Systems Control



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  • PLC programming Step 2: develop the ladder diagram

  • There are three loads (20, 21, 22) and hence, we need at least three rungs

  • The first rung represents the logic of unloading a completed part from machine onto AGV, and its condition is AGV has arrived (01) and AGV has space to store a processed part (03) and machine has a finished part to be unload (04)

  • The second rung represents the logic of picking a new part from the AGV and loading onto the machine, and its condition is that the part has been unloaded from (20) or AGV has arrived (01) and machine does not have finished to unload (~ 04), and AGV is carrying a new part to be processed (02)

  • The third rung represents the logic of dispatching the AGV. You are invited to figure out the logic.

In summary, the ladder diagram is shown below.



01

03

04

20

21

04

01

01

20

02

02

04

01

02

20

04


03

21

22


Fig. 16: the ladder diagram of the AGV example


  • PLC programming Step 3: testing the ladder diagram.

  • PLC programming Step 4: downloading




  1. Example 2: traffic light control

  • Action required: control the traffic light following the timing (in sec.) below:






Light

Street

Red

Yellow

Green

Total

Main St.

30

10

40

80

Jordan St.

50

10

20

80

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