Automating Manufacturing Systems - Process Control and ...

plc advanced functions - 16.38
input ’scanner_value_valid’. The PLC must store this code until the parts pass through the
oven. When the parts leave the oven they are detected by a proximity sensor connected to
’part_leaving’. The barcode value read before must be output to ’barcode_output’. Write the
ladder logic for the process. There can be up to ten parts inside the oven at any time.
8. Write the ladder logic for the state diagram below using subroutines for the states.
FS
ST1
A
B
ST2
D
ST3
C
9. Convert the following state diagram to ladder logic using subroutines.
C
FS A B
X Y Z
D
E
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