Master DH 41 H Service Manual download pdf (Page 68)

100

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

Structure of the DP-V1 parameter channel

PROFIBUS-DP-V1 Functions

Processing

sequence for the

DP-V1 master

If the bus cycles are very short, the request for the parameter response arrives before

the MOVI-PLC

advanced DHF41B control card has concluded parameter access in the

device. This means that the response data from MOVI-PLC

advanced DHF41B is not

yet available. In this case, the MOVI-PLC

advanced DHF41B control card sends a

negative answer with the Error_Code _1 = 0xB5 (status conflict) to the DP-V1 level.

The DP-V1 master then repeats the request with the above Read.req header until it

receives a positive response from the MOVI-PLC

advanced DHF41B control card.

MOVILINK

parameter

requests

The MOVILINK

parameter channel of the MOVI-PLC

advanced DHF41B control card

is directly mapped in the structure of dataset 47. The Request ID 0x40 (SEW

MOVILINK

service) is used to exchange MOVILINK

parameter requests. Parameter

access with MOVILINK

services usually takes place according to the structure

described below. The typical message sequence for dataset 47 is used.

Request ID: 0x40 SEW MOVILINK® service

The actual service is defined by the dataset element Attribute in the MOVILINK

parameter channel. The high nibble of this element corresponds to the service nibble in

the management byte of the DP parameter channel.

53127AXX

Send Write.request

with Parameterdata

Send DS_Read.req

with Parameterdata

Check Write.

response

Write.response

negative

Write.response

positive

Parameter transfer

aborted with ERROR

Read.

response

State

Conflict?

Other Errors

or Timeout

yes

Parameter transfer

ok, data available

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Master DH 41 H Service Manual Page 68

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