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Automating Manufacturing Systems - Process Control and ...

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plc network - 28.6<br />

7 - application<br />

6 - presentation<br />

gateway<br />

5-session<br />

4 - transport<br />

3 - network<br />

2 - data link<br />

1 - physical<br />

repeater<br />

bridge/<br />

switch<br />

router<br />

Figure 28.4<br />

Network Devices <strong>and</strong> the OSI Model<br />

Layer Computer #1<br />

Computer #2<br />

7<br />

Application<br />

Application<br />

6<br />

Presentation<br />

Presentation<br />

5<br />

Session<br />

Session<br />

4<br />

Transport<br />

Router<br />

Transport<br />

3<br />

Network<br />

Network<br />

Network<br />

2<br />

Data Link<br />

Data Link<br />

Data Link<br />

1<br />

Physical<br />

Physical<br />

Physical<br />

Interconnecting Medium<br />

Figure 28.5<br />

The OSI Network Model with a Router

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