The Profibus Cable Connector; Shielding The Profibus Cable - GE VersaPoint IC220PBI002 User Manual

The Profibus Cable Connector

Most Profibus devices, including the VersaPoint Network Interface Unit, provide
the Profibus standard female 9-pin D subminiature connectors. Cable connectors
are available from Siemens parts distributors as "Profibus 9-pin D connectors".
These connectors provide termination resistors and a switch on the connector to
enable/disable termination.
The connectors label the connections for the twisted pair as cable A and cable B.
The following table illustrates the proper assignment of wire to connector to pin to
signal.
Pin
1, 2, 7, 9

Shielding the Profibus Cable

Cable shielding is recommended at higher baud rates. Cable shields must be
attached at each device via the connector shells.
When mounting the NIU in the cabinet, connect the cable shield of the connected
Profibus cable with a shield bus via cable clamps. Use an appropriate shield
clamp for this.
GFK-1911B Chapter 4 Installation
Signal
Reserved
3 RxD/TxD-P (receive/transmit data +), cable B
4 CNTR-P (control signal for repeater), direction control
5 DGND (reference potential up to 5V)
6 VP (supply voltage +5V for termination resistors)
8 RxD/TxD-N (receive/transmt data -), cable A
RxD/TxD-P (3)
DGND (5)
VP (6)
RxD/TxD-N (8)
Red (B)
RxD/TxD-P (3)
DGND (5)
VP (6)
Green (A)
RxD/TxD-N (8)
4
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