Chapter 7 Deployment of the CPU 21xDP Manual VIPA CPU 21x
7-22 HB103E - Rev. 05/45
Profibus employs a screened twisted pair cable based on RS485 interface
specifications as the data communication medium.
Note!
The Profibus line must be terminated with ripple resistor. Please ensure
that the last participant the line is terminated by means of a terminating
resistor.
The "EasyConn" bus connector is provided with a switch that is used to
activate a terminating resistor.
Attention!
The terminating resistor is only effective, if the connector
is installed at a slave and the slave is connected to a
power supply.
Note!
A complete description of installation and deployment of
the terminating resistors is delivered with the connector.
The following picture illustrates the terminating resistors of the respective
start and end station.
RxD/TxD-P(B)
Shield
Master
Slave
3
8
3
8
P5V P5V
M5V M5V
330 330
330 330
220 220
3
8
RxD/TxD-N(A)
5
6
RxD/TxD-P(B)
RxD/TxD-N(A)
Slave
RxD/TxD-P(B)
RxD/TxD-N(A)
5
3
8
6
Shield
Shield
Profibus using
RS485
Termination
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