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Manual – MOVI-PLC® advanced DH.41B Controller

Introduction to PROFIBUS-DP-V1

PROFIBUS-DP-V1 Functions

The PROFIBUS-DP-V1 network differentiates between various master classes.

Class 1 master

(C1 master)

The C1 master performs the cyclical data exchange with the slaves. Typical C1 masters

include control systems, such as PLCs, which exchange cyclical process data with the

slave. If the DP-V1 function has been activated via the GSD file, the acyclical connection

between C1 master and slave is established automatically when the cyclical connection

of the PROFIBUS-DP is being established. Only one C1 master can be operated in a

PROFIBUS DP-V1 network.

Class 2 master

(C1 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

communication 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 enables cyclical

data exchange with the slaves using 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

advanced DHF41B

control card supports two parallel C2 connections.

Datasets (DS) User data transported via a DP-V1 service is collected in datasets. Each dataset is

identified uniquely by its length, a slot number and an index. The structure of dataset 47

is used for DP-V1 communication with the MOVI-PLC

advanced DHF41B control card.

This dataset is defined 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 procedures for accessing parameter data in the MOVI-PLC

advanced

DHF41B control card 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 han-

dling

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 dataset

Write Write dataset

C2 master Connection type: MSAC2 (master/slave acyclical C2)

INITIATE Establish C2 connection

ABORT Disconnect C2 connection

Read Read dataset

Write Write dataset