Siemens SIMATIC S7 System Manual page 195

The following figure shows an example to illustrate the utility of the GET and PUT
instructions. For this example, consider a production line where tubs of butter are being filled
and sent to one of four boxing machines (case packers). The case packer packs eight tubs
of butter into a single cardboard box. A diverter machine controls the flow of butter tubs to
each of the case packers. Four CPUs control the case packers, and a CPU with a TD 400
operator interface controls the diverter.
t
b
g
eee
f
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Out of butter tubs to pack; t=1, out of butter tubs
Box supply is low; b=1, must add boxes in the next 30 minutes
Glue supply is low; g=1, must add glue in the next 30 minutes
Error code identifying the type of fault experienced
Fault indicator; f=1, the case packer has detected an error
Program instructions
7.3 Communication
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