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Manual – MOVIDRIVE® MDX61B MOVI-PLC® DHP11B Control Card
6
Introduction to PROFIBUS DP-V1
DP-V1 Functions
The PROFIBUS DP-V1 network differentiates between various master classes.
Class 1 master
(C1 master)
The C1 master essentially performs the cyclical data exchange with the slaves. A typical
C1 master is a control system, such as a PLC, that exchanges cyclical process data with
the slave. If the DP-V1 function has been activated via the GSD file, the acyclical con-
nection between the C1 master and the slave is set up automatically when the cyclical
connection of the PROFIBUS DP-V1 is being established. Only one C1 master can be
operated in a PROFIBUS DP-V1 network.
Class 2 master
(C2 master)
The C2 master itself does not perform cyclical data exchange with the slaves. Examples
of a typical C2 master are visualization systems or temporarily installed programming
devices (Notebook / PC). The C2 master uses exclusively acyclic connections for com-
munication with the slaves. The acyclic connections between C2 master and slave are
established by the
Initiate
service. The connection is established once the
Initiate
ser-
vice has been performed successfully. An established connection enables cyclical data
exchange with the slaves using
Read
or
Write
services. Several C2 masters can be ac-
tive in a DP-V1 network. The number of C2 connections, established simultaneously for
a slave, is determined by the slave. The DHP11B control card supports two parallel C2
connections.
Data sets (DS)
The user data transported via a DP-V1 service are collected in data sets. Each data set
is identified uniquely by its length, a slot number and an index. The structure of data set
47 is used for DP-V1 communication with the DHP11B control card. This data set is de-
fined as the DP-V1 parameter channel for drives as of V3.1 in the PROFIdrive profile
drive engineering of the PROFIBUS Nutzerorganisation (user group). Different proce-
dures for accessing parameter data in the DHP11B control card are provided via this pa-
rameter channel.
DP-V1 services
The DP-V1 expansions offer new services, which can be used for acyclical data
exchange between master and slave.
The system distinguishes between the following services:
DP-V1 alarm
handling
In addition to the acyclical services, the DP-V1 specification also defines extended
alarm handling. The PROFIBUS DP-V1 system differentiates between various alarm
types. As a result, unit-specific diagnostics cannot be evaluated in DP-V1 operation via
the 'DDLM_SlaveDiag' DP-V1 service. DP-V1 alarm handling has not been defined for
drive engineering.
C1 master
Connection type: MSAC1 (master/slave acyclical C1)
Read
Read data set
Write
Write data set
C2 master
Connection type: MSAC2 (master/slave acyclical C2)
INITIATE
Establish C2 connection
ABORT
Disconnect C2 connection
Read
Read data set
Write
Write data set
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