System Manual – MOVIDRIVE® compact Drive Inverters
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Starting the inverter with PROFIBUS-DP (MC_41A)
Startup
Reading a
parameter via
PROFIBUS-DP
(Read)
To execute a READ service via the parameter channel, due to the cyclical transfer of the
parameter channel, the handshake bit may be changed only after 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 inverter 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 need to be set.
The inverter now processes the read service and sends back the service confirmation
by changing the handshake bit.
The data length is not relevant, you only need to enter the service identifier for the READ
service. This service is now activated in the drive inverter when the handshake bit
changes. It would be possible to activate the read service with the management byte
coding 01
hex
or 41
hex
.
Byte 0: Management
7
6
5
4
3
2
1
0
0
0/1
X
X
0
0
0
1
Service identifier:
0001 = Read
Data length:
Not relevant for Read service
Handshake bit:
Must be changed with every new job.
Status bit:
0 = No error in service execution
1 = Error in service execution
X
= not relevant
0/1 = Bit value is changed
0
0
I
Summary of Contents for MOVIDRIVE compact MCH41A
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