Technical data

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

Parameter setting via PROFIBUS-DP

Operating Characteristics on PROFIBUS-DP

Data range As shown in the following table, the data is contained in byte 4 through byte 7 of the

parameter channel. This means up to 4 bytes of data can be transmitted per service.

The data is always entered with right-justification; that is, byte 7 contains the least

significant data byte (Data LSB) whereas byte 4 is the most significant data byte (Data

MSB).

Incorrect execu-

tion of a service

The status bit in the management byte 0 is set to indicate that a service has been

executed incorrectly. If the received handshake bit is identical to the transmitted hand-

shake bit, the MOVI-PLC

advanced DHF41B control card has executed the service. If

the status bit now signals an error, the error code is entered in the data range of the

parameter telegram. Byte 4 ... 7 send back the return code in a structured format

(→-Sec. "Return codes for parameter setting").

Reading a

parameter via

PROFIBUS-DP

Due to the cyclical transfer of the parameter channel, to execute a read service via the

8-byte MOVILINK

parameter channel, the handshake bit may only be changed if the

complete parameter channel has been set up for the specific service. As a result, adhere

to the following sequence when reading a parameter:

1. Enter the index of the parameter to be read in byte 2 (Index high) and byte 3 (Index

low).

2. Enter the service identifier for the read service in the management byte (byte 0).

3. Transfer the read service to the MOVI-PLC

advanced DHF41B control card by

changing the handshake bit.

Since this is a read service, the sent data bytes (bytes 4...7) and the data length (in the

management byte) are ignored and do not have to be set.

Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7

Manage-

ment

Reserve

Index high Index low Data MSB Data Data Data LSB

High byte 1 Low byte 1 High byte 2 Low byte 2

High word Low word

Double word

Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7

Manage-

ment

Reserved Index high Index low Error class Error code Add. code

high:

Add. code

low

Status bit = 1: Incorrect execution of a service