A product moves continuously down an assembly line that has four
stations, as shown in â—» Figure 12-44.
The product enters the inspection zone, where its presence is sensed by the
proximity switch.
The inspector examines it and activates a reject button if the product fails
inspection.
If the product is defective, reject status lights come on at stations 1,2 , and 3 to
tell the assembler to ignore the part.
When a defective part reaches station 4 , a diverter gate is activated to direct that
part to a reject bin.
Using whatever PLC bit shift register you are most familiar with, develop a
program to implement this process.
Figure 12-44 Assembly line program for Problem 7.
7. A product moves continuously down an assembly line that has four
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stations, as shown in Figure 12-44.
The product enters the inspection zone.where its presence is sensed by the
proximity switch.
: The inspector examines it and activates a reject button if the product fails
inspection.
If the product is defective, reject status lights come on at stations 1, 2, and 3 to
tell the assembler to ignore the part.
When a defective part reaches station 4, a diverter gate is activated to direct that
part to a reject bin.
Using whatever PLC bit shift register you are most familiar with, develop a
program to implement this process.
Station
Station 2
Station Station 3 4
Reject lamp status
Reject lamp status
Reject lamp status
Product
Inspection zone
Proximity switch
Gate
Figure 12-44 Assembly line program for Problem 7.
