SEW-Eurodrive MOVI-PLC basic DHP11B-T0, Руководство пользователя

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6
PROFIBUS-DP-V1 Functions
Introduction to PROFIBUS-DP-V1
Manual – MOVI-PLC
®
basic DHP11B.. controller
59
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
connection 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
for a typical C2 master are visualization systems or temporary installed programming
units (Notebook / PC). The C2 master uses exclusively acyclic connections for commu-
nication with the slaves. The acyclic connections between C2 master and slave are
established by the
initiate service. The connection is established once the initiate
service has been performed successfully. An established connection allows for cyclical
data exchange with the slaves by means of
read or write services. Several C2 masters
can be active in a DP-V1 network. The number of C2 connections, established simulta-
neously for a slave, is determined by the slave. The MOVI-PLC
®
basic 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 MOVI-PLC
®
basic DHP11B.. controller.
This data set is defined as the DP-V1 parameter channel for drives as of V3.1 in the
PROFIdrive profile drive engineering of the PROFIBUS user organization. Different
procedures for accessing parameter data in the MOVI-PLC
®
basic DHP11B.. controller
are provided via this parameter 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
using 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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