Allen-Bradley 2080-OB4 - Page 63

Rockwell Automation Publication 2080-UM004C-EN-E - March 2015 55
DeviceNet Plug-in – 2080-DNET20 Appendix 5
Transaction Block Format
Byte Offset Contents
0Status
1 Transaction ID
2Size
3 Reserved
4MAC ID
5 Service
6…115 Transaction Body (110 bytes)
Explicit Message Request Format
Byte Offset Contents
0 Status
1 Transaction ID
2Size
3 Reserved
4 MAC ID
5 Service
6…7 Class
8…9 Instance
10…115 Service Data (106 Bytes)
Explicit Message Response Format
Byte Offset Contents
0 Status
1 Transaction ID
2Size
3Reserved
4MAC ID
5Service
Byte Offset Contents Request Data
0 Status Can be read from UDFB status
6…115 ServiceData Can be read from UDFB response data.
Response data shows CIP error Code.
Explicit Message Status Codes
Status Code Description
0 Ignore transaction block (block empty).