Appendix B: Profibus
®
DP Secondary Communication
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Appendix B: Profibus
®
DP Secondary Communication
Overview
This appendix describes the Gateway’s support for Pro-
fibus DP and details the configuration steps necessary
to set up a Gateway Assembly with an S7300 PLC,
CPU315-2DP via Profibus. It does
not
provide a
detailed description of Profibus, but only a brief introduc-
tion, necessary to define the terms that are used
throughout the remainder of this document.
Introduction
Profibus DP stands for “Profibus for Decentralized
Peripherals”. Profibus DP is a device level bus that sup-
ports both analog and discrete signals. It has wide-
spread usage for such items as remote I/O systems,
motor control centers, and variable speed drives. Profi-
bus DP communicates at speeds from 9.6 Kbps to 12
Mbps over distances from 100 to 1,200 meters.
The protocol supported by the Profibus DP option card
is
Profibus DP Secondary
. Therefore, the Gateway
Assembly must be linked to a Profibus network with a
PLC.
Profibus Port Protocols
The Profibus option card has one Profibus port. See
F
IG
. 22.
F
IG
. 22: Profibus PLC Connection
Profibus Option
Card
PLC Connection
