Profibus Dp-V1 Overview - Leroy-Somer digitax st User Manual

8.4

PROFIBUS DP-V1 Overview

The PROFIBUS DP-V1 specification allows for the standard cyclic process data (as
defined in the DP-V0 specification) and the additional acyclic parameter data to be
transmitted in the same bus cycle.
The DP-V1 message is contained within the acyclic part of the PROFIBUS-DP cycle
and uses the slave node address to access the parameter channel.
For further details of the PROFIBUS DP-V1 functionality refer to the official PROFIBUS
website at www.profibus.com
The following services will be supported:
• Class 1 Master Read and Write
• Class 2 Master Read and Write
• Class 2 Master Initiate Connection
• Class 2 Master Abort Connection
A class 1 master must be in data exchange with the slave before it can perform a
request via the DP-V1 channel. A class 2 master must initiate the connection with the
slave before sending the DP-V1 message, likewise it must then abort the connection
when it is no longer required.
SM-PROFIBUS DP-V1 supports the simultaneous connection to one class 1 master
NOTE
and one class 2 master.
SM-PROFIBUS DP-V1 supports the following features:
• DP-V1 Parameter Access
• PROFIdrive PNU Access (see section 11.11 PROFIdrive PNU access )
• Fault Buffer (see section 11.12 Fault Buffer )
• Drive Identification (see section 11.13 Drive Identification )
• Identification and Maintenance Functions (see section 11.14 Identification and
Maintenance Functions )
The maximum DP-V1 message length is restricted to 128 bytes including the four bytes
of the DP-V1 header and the four bytes of the PROFIdrive request, this leaves a
maximum of 120 bytes for the parameter data; the maximum number of parameters that
can be read or written in a single message is shown in Table 8.1.
Table 8.1 Single message parameter limitation
Mode
Read
Write
30
Maximum number of parameters
16-bit
20
12
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32-bit
20
10
SM-PROFIBUS DP-V1 User Guide
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