Eaton Electrical PROFIBUS-DP EZ204-DP ユーザーズマニュアル

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MN05013001E

The first and last station in a bus segment must be connected 

to the bus with the bus terminating resistor switched on. The 

bus terminating resistor is switched externally. This external 

switch function can either be implemented as a separate bus 

terminating resistor or with a special Sub-D plug with an 

integrated bus termination. 
Eaton's PROFIBUS-DP data plug enables both bus 

terminating resistors to be switched on and off.

Electromagnetic interference may have adverse effects on the 

communication fieldbus. This can be minimized in advance by 

taking suitable EMC measures. These include:
• System design in accordance with EMC requirements, 
• EMC cabling and
• Measures that prevent the occurrence of large potential 

differences,

• Correct installation of the PROFIBUS system (cable, 

connection of bus connector,...).

The effects of electromagnetic interference can be 

significantly reduced by fitting the shield. The following two 

figures illustrate how to fit the shield.