ILX69-PBM ♦ CompactLogix™ or MicroLogix™ Platform
About the ILX69-PBM
PROFIBUS Master Communication Module
User Manual
ProSoft Technology, Inc.
Page 17 of 113
3.2
PROFIBUS Interface
PROFIBUS Interface (D-Sub female connector, 9 pin):
Connection with D-
Sub female connector
Signal
Description
3
RxD / TxD-P
Receive/Send Data-P, respectively connection B plug
4
CNTR-P
Repeater-Control
5
DGND
Data Ground
6
VP
Positive supply voltage
8
RxD / TxD-N
Receive/Send Data-N, respectively connection A plug
3.2.1 Wiring Instructions
Please ensure that termination resistors are available at both ends of the PROFIBUS
network cable. If special PROFIBUS connectors are being used, these resistors are
often found inside the connector and must be switched on at each end of the PROFIBUS
network cable.
For baud rates above 1.5 MBaud, use only special connectors for higher baud rates.
These include additional inductance.
It is not permitted to have T-stubs on PROFIBUS high baud rates. Use only a special
cable which is approved for PROFIBUS DP. Make a solid connection from the cable
shield to ground at every device and make sure that there is no potential difference
between the grounds at the devices.
