Communications Card Description ZB4-604-IF1, PROFIBUS-DP 5-6
Moeller 07/01 AWB-C2700-1347GB
4.5 Bus Connector
Only use bus connectors that are specified for use in the PROFIBUS networks. These connect both bus
cables to a bus station and ensure that the cable shield is passed through with a low impedance and is
connected to the shield reference potential of the bus station.
The bus connectors contain the PROFIBUS line terminating resistor that is switched on with a slide switch if
required. Furthermore, components have been integrated for compensating the capacitive load of the bus
station, as is required for bit rates above 1.5 Mbit.
Recommended bus connector: ZB4-209-DS2
4.6 Line Termination
The PROFIBUS network must be terminated at both ends in accordance with the requirements of the
PROFIBUS standard. The termination is passive, but is fed from the bus station and ensures a specified idle
state potential on the bus when no bus station is active (all bus stations Tri-State).
• The bus segment must be terminated at both ends!
• No more than two terminating resistors must be switched on per bus segment!
• At least one of the two terminating resistors must be fed by the bus station!
Operation without the correct termination of the PROFIBUS network can cause transmission errors.
390
220
390
VP (6)
Rxd/TxD-P (3)
Rxd/TxD-N (8)
DGND (5)
PROFIBUS line
termination to
EN 50 170
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