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Manual – MOVI-PLC® advanced DHF41B DeviceNet and PROFIBUS DP-V1 Fieldbus Interfaces
10
Parameter setting via PROFIBUS-DP
PROFIBUS DP-V1 Operating Characteristics
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 with
PROFIBUS-DP
(write)
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 through 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 MOVI-PLC
®
advanced
DHF41B by changing the hand-
shake bit.
MOVI-PLC
®
advanced
DHF41B now processes the write service and sends the service
confirmation back by changing the handshake bit.
7 / MSB
6
5
4
3
2
1
0 / LSB
0
0/1
1)
1) Bit value is changed
X
2)
2) Not relevant
X
2)
0
0
0
1
Service identifier
0001 = Read parameter
Data length
Irrelevant 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
0
0
I
Summary of Contents for DHF41B
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