Rockwell Automation RECOMM-DNET DeviceNet Adapter for use with DPI AC Drives - Manual (Page 70)

7-4 DeviceNet Adapter for use with DPI AC Drives
7.3 Formatting Explicit Messages for a
PLC or SLC Controller
Transaction blocks in PLC and SLC scanners accommodate both
downloading Explicit Message Requests and uploading Explicit
Message Responses. The scanner module can accommodate one
request or response for each transaction block. Each transaction
block must be formatted as shown in figure 7.2 or figure 7.3.
Refer to tables 7.2 and 7.3 for a description of the data that is
required in each word.
Bit 15 0 15 0
Word 0 TXID Command TXID Status
Port Size Port Size
Service Address Service Address
Class Service Response Data
Instance
Attribute
Word 6 - 31 Service Data
Word 32 TXID Command TXID Status
Port Size Port Size
Service Address Service Address
Class Service Response Data
Instance
Attribute
Word 38 - 63 Service Data
Figure 7.2 – PLC Explicit Message Format
Bit 15 0 15 0
Word 0 TXID Command TXID Status
Port Size Port Size
Service Address Service Address
Class Service Response Data
Instance
Attribute
Word 6 - 31 Service Data
Figure 7.3 – SLC Explicit Message Format
Request Response
Request Response