Technical data

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

Structure of the DP-V1 parameter channel

PROFIBUS-DP-V1 Functions

PROFIdrive

parameter

requests

The PROFIdrive parameter channel of the MOVI-PLC

advanced DHF41B control card

is directly mapped in the structure of dataset 47. Parameter access with PROFIdrive

services takes place according to the structure described below. The typical message

sequence for dataset 47 is used. PROFIdrive only defines the two request IDs

• Request ID: 0x01request parameter (PROFIdrive)

• Request ID: 0x02change parameter (PROFIdrive)

This means there is restricted data access in comparison with the MOVILINK

services.

Example for

reading a parame-

ter via PROFIdrive

The following tables show an example of the structure of the Write.request and Read.req

user data for reading an individual parameter via the MOVILINK

parameter channel.

Sending parameter request

The following table shows the coding of the user data for the Write.req service including

the DP-V1 header. The Write.req service is used to transfer the parameter setting

request to the MOVI-PLC

advanced DHF41B control card.

The request ID 0x02 = change parameter (PROFIdrive) ensures remanent write access

to the selected parameter. Consequently, the internal Flash of the MOVI-PLC

advanced DHF41B control card is written with each write access. Use the MOVILINK

Write parameter volatile service if parameters must be written cyclically at short inter-

vals. With this service, you only alter the parameter values in the RAM of the

MOVI-PLC

advanced DHF41B control card.

Service: Write.request

Slot_Number 0 Random, (is not evaluated)

Index 47 Index of the dataset; constant index 47

Length 10 10 byte user data for parameter request

Byte Field Value Description

0 Request reference 0x01 Individual reference number for the parameter setting

order that is reflected in the parameter response

1 Request ID 0x01 Request parameter (PROFIdrive)

2 Axis 0x00 Axis number; 0 = Single axis

3 No. of parameters 0x01 1 parameter

4 Attributes 0x10 Access to parameter value

5 No. of elements 0x00 0 = access to direct value, no subelement

6..7 Parameter Number 0x206C MOVILINK

index 8300 = 'Firmware version'

8..9 Subindex 0x0000 Subindex 0