28
MOVIDRIVE
®
PROFIBUS DFP11A
3
The PROFIBUS-DP
Interface
3.7.1.3 Data Area
As shown in Fig. 26 the data are contained in byte 4 to byte 7 of the parameter channel. This allows
a maximum of 4-byte data to be transferred per each service. The data are generally entered flush
right, i.e. byte 7 contains the least significant data byte (data LSB), byte 4 correspondingly the
most significant data byte (data MSB).
00148AEN
Fig. 26: Definition of the data area in the parameter channel
3.7.1.4 Faulty Execution of Service
Faulty execution of service is signalled by setting the status bit in the management byte. If the
received handshake bit is identical to the transferred handshake bit, the drive inverter has executed
the service. If the status bit indicates an error, the error code is entered in the data area of the
parameter message (Fig. 27). Bytes 4-7 provide the Return Code in a structured format (see the
section Return Codes).
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Fig. 27: Structure of the parameter channel in the event of faulty execution of service
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Management
Reserved
Index High
Index Low
Data MSB
Data
Data
Data LSB
High byte 1
High byte 2
Low byte 1
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
Management
Reserved
Index High
Index Low Error class
Error code
Add. code
high
Add. code
low
Status bit = 1: faulty execution of ser vice