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Spc3 profibus interface center, 9 profibus interface – Siemens SPC3 User Manual

Page 59

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SPC3

PROFIBUS Interface Center

SPC3 Hardware Description

V1.3

Page 57

Copyright (C) Siemens AG 2003 All rights reserved.

2003/04

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

Function

RTS

Output

Request to send

TXD

Output

Sending data

RXD

Input

Receiving data


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