Connecting The Profibus Cable - Control Technology 2500 Series Installation And Operation Manual

2.6. Connecting the Profibus Cable

The Profibus port is used to connect the 2500-RBC to a Profibus DP network. Appendix A describes
how to connect a 12 Mbaud RS-485 cable to the PROFIBUS-DP port. The figure below shows the
required pinout for the DB9 Profibus port.
NOTE: Pins 2 and 7 are "No Connect" for the RBC. For some PROFIBUS products, these pins are
used to provide 24 VDC for powering a programming or configuration tool. Such tools are not
powered by the RBC; however, it is acceptable for an externally-powered PROFIBUS programming
TX/RX –
BIAS SUPPLY +5V
Pin 5 (BIAS SUPPLY +5V) and Pin 6 (BIAS SUPPLY GND) on the Profibus-DP connector are
designed to support termination of the Profibus-DP cable only. These pins have a limited
output power capability of approximately 0.45W. Overloading these pins by using the voltage
to drive other than the normal terminating resistors can cause internal component damage to
CTI 2500-RBC Installation and Operation Guide V1.6
or configuration tool to drive pins 2 and 7 to 24 VDC.
(D-shell)
CHASSIS GND
5
9
4
8
3
7
2
6
1
the 2500-RBC.
NOTE:
BIAS SUPPLY GND
TX/RX +
* for Pin 3: Terminal B on Siemens connector
* for Pin 8: Terminal A on Siemens connector
CAUTION:
Female 9-Pin D-Connector
Pin Signal
1 CHASSIS GND
2 NO CONNECT
3* TX/RX+
4 RTS
5 BIAS SUPPLY GND
6 BIAS SUPPLY +5V
7 NO CONNECT
8* TX/RX-
9 BIAS SUPPLY GND
11