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9 PROFIBUS Interface
9.1 Pin Assignment
The data transmission is performed in RS 485 operating mode (i.e., physical RS 485).
The SPC3 is connected via the following signals to the galvanically isolated interface drivers.
Signal Name
Input/
Output
RTS
Output
TXD
Output
RXD
Input
The PROFIBUS interface is a 9-way, sub D, plug connector with the following pin assignment.
Pin 1 - Free
Pin 2 - Free
Pin 3 - B line
Pin 4 - Request to send (RTS)
Pin 5 - Ground 5V (M5)
Pin 6 - Potential 5V (floating P5)
Pin 7 - Free
Pin 8 - A line
Pin 9 - Free
The cable shield must be connected to the plug connector housing.
The free pins are described as optional in EN 50170 Vol. 2. If used, they should conform to the
specifications in DIN192453.
CAUTION:
The designations A and B of the lines on the plug connector refer to the designations in the RS 485
standard, and not the pin designation of driver ICs.
Keep the cable from driver to connector as short as possible.
Use of higher baud rates )i.e., 3 to 12 Mbaud) requires the use of new plug connectors. These connectors
compensate for line interferences on all possible combinations of cables.
6ES7 972-0BB10-0XA0 with PG socket
6ES7 972-0BA10-0XA0 without PG socket
SPC3 Hardware Description
Copyright (C) Siemens AG 2003 All rights reserved.
SPC3
Function
Request to send
Sending data
Receiving data
V1.3
PROFIBUS Interface Center
Page 57
2003/04
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