User Manual

Siemens Building Technologies PROFIBUS DP/P-bus link
Building Automation User's guide 1-1
1 General
1.1 Overview
The DP/P-bus link connects the DESIGO P-bus to the Profibus DP (“Distributed Peripher-
als”).This allows the direct exchange of data between DESIGO I/O modules and the SIMATIC
S7 via Profibus DP.
1.2 Application
The purpose of the DP/P-bus link is to connect two communications media, the P-bus and the
Profibus DP, allowing access to the DESIGO I/O modules from a SIMATIC S7.
Within the SIMATIC, the DESIGO I/O modules are treated as standard Profibus DP data points.
On the Profibus, the link operates as a Profibus DP slave, supporting datagram traffic in the
direction of the Profibus DP master (SIMATIC S7). On the P-bus, the link operates as the P-bus
master, and is responsible for the flow of data to and from the DESIGO I/O modules. All data
transferred via the DP/P-bus link is converted into the datagram format used by the communica-
tions partner.
Engineering is carried out using standard Profibus DP engineering methods. The properties of
the DESIGO I/O modules are saved in the product-specific Profibus master device file (the
.GSD file of the Profibus DP/P-bus link). The .GSD file provides the basis for engineering with
the Profibus project engineering tool (e.g. SIMATIC Manager).
The DP/P-bus link itself does not require engineering. It receives its parameters from the
Profibus DP master assigned to it (e.g. the SIMATIC S7).