PLX51-PBM
Operation
PROFIBUS DPV0/DPV1 Master or Slave to EtherNet/IP™ or Modbus® Gateway
User Manual
ProSoft Technology, Inc.
Page 131 of 196
Below is the format of the Holding Registers used for DPV1 Class 1 Messaging.
Table 5.46
– Modbus DPV1 Class 1 Request Message Holding Register Format
DPV1 Request
Holding
Register Offset
Description
Trigger
0
Bit 0
– Trigger Message Send
Timeout
1
The time in Milliseconds if no response has been received
before the transaction times out
Slave Address
2
Target PROFIBUS Slave node address
Function
3
0
– Read
1
– Write
Data Size
4
Size of the data to follow
Data
5
Request data (eg. Slot, Index, Size, and Data)
Table 5.47
– Modbus DPV1 Class 1 Response Message Holding Register Format
DPV1 Response
Holding
Register Offset
Description
Response Size
128
Size of all bytes following
Status
129
This is the status of the DPV1 data exchange. See appendix
for the definitions of the returned status.
Reserved
130
Data Size
131
The size of the data to follow.
Data
132
The response data
