Example Of Network Read And Network Write - Siemens SIMATIC S7-200 System Manual

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SIMATIC Instructions

Example of Network Read and Network Write

Figure 9-68 shows an example to illustrate the utility of the NETR and NETW

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 CPU 221

modules are used to control the case packers and a CPU 222 module equipped

with a TD 200 operator interface is used to control the diverter. Figure 9-68 shows

the network setup.

f e e e 0 g b t

fault indicator; f=1, the case packer has detected an error

glue supply is low; g=1, must add glue in the next 30 minutes

box supply is low; b=1, must add boxes in the next 30 minutes

out of butter tubs to pack; t=1, out of butter tubs

eee error code identifying the type of fault experienced

cases packed

Example of NETR and NETW Instructions

Receive buffer

Receive buffer

Receive buffer

Receive buffer

S7-200 Programmable Controller System Manual

Transmit buffer

Transmit buffer

Transmit buffer

Transmit buffer

A5E00066097-02

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