Technical data

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

Parameter setting via PROFIBUS-DP

Operating Characteristics on PROFIBUS-DP

The MOVI-PLC

advanced DHF41B control card now processes the read service and

sends the service confirmation back by changing the handshake bit.

The above table shows how a read service is coded in management byte 0. The data

length is irrelevant, only the service identifier for the read service must be entered. This

service is now activated in the MOVI-PLC

advanced DHF41B control card when the

handshake bit changes. For example, it would be possible to activate the read service

with the management byte coding 01hex or 41hex.

Writing a

parameter via

PROFIBUS-DP

Due to the cyclical transfer of the parameter channel, to execute a write 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. Observe the

following sequence when writing a parameter:

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

low).

2. Enter the data to be written in bytes 4...7.

3. Enter the service identifier and the data length for the write service in the manage-

ment byte (byte 0).

4. Transfer the write service to the MOVI-PLC

advanced DHF41B control card by

changing the handshake bit.

The MOVI-PLC

advanced DHF41B control card now processes the write service and

returns the service confirmation by changing the handshake bit.

7 / MSB 6 5 4 3 2 1 0 / LSB

00/1

1) Bit value is changed

2) Not relevant

0001

Service identifier

0001 = Read parameter

Data length

Not relevant for Read service

Handshake bit

Must be changed on every new task in cyclical transmission.

Status bit

0 = No error during execution of service

1 = Error during execution of service