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System Manual – MOVIDRIVE® compact Drive Inverters
10
Starting the inverter with PROFIBUS-DP (MC_41A)
Startup
Management of
the parameter
channel
The entire procedure for setting parameters is coordinated with "byte 0: Management".
This byte provides important service parameters such as service identifier, data length,
version and status of the service performed. Bits 0, 1, 2 and 3 contain the service iden-
tifier. These bits determine which service is to be executed. Bit 4 and bit 5 specify the
data length in bytes for the write service; it should be set to 4 bytes for all SEW drive
inverters.
Bit 6 is used as an acknowledgment between the controller and the drive inverter. It
triggers the execution of the transmitted service in the drive inverter. In PROFIBUS-DP
the parameter channel is transmitted cyclically with the process data. For this reason,
the implementation of the service in the drive inverter must be triggered by edge control
using the handshake bit 6. For this purpose, the value of this bit is altered (toggled) for
each new service that is to be executed. The drive inverter uses the handshake bit to
signal whether the service has been executed or not. The service was executed if the
handshake bit received in the controller is identical with the transmitted handshake bit.
Status bit 7 indicates whether it was possible to execute the service properly or if errors
occurred.
Index addressing
With "byte 2: Index high " and "byte 3: Index low determines the parameter read or
written via the fieldbus system. The parameters of a drive inverter are addressed with a
uniform index regardless of the connected fieldbus system. Byte 1 should be viewed as
reserved and must always be set to 0x00.
Byte 0: Management
MSB
LSB
Bit:
7
6
5
4
3
2
1
0
Service identifier:
0000 = No service
0001 = Read parameter
0010 = Write parameter
0011 = Write parameter volatile
0100 = Read minimum
0101 = Read maximum
0110 = Read default
0111 = Read scale
1000 = Read attribute
1001 = Read EEPROM
Data length:
00 = 1 byte
01 = 2 bytes
10 = 3 bytes
11 = 4 bytes (must be set)
Handshake bit:
Must be changed on every new task in
cyclical transmission.
Status bit:
0 = No error in service execution
1 = Error in service execution
0
0
I
Summary of Contents for MOVIDRIVE compact MCH41A
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