Rockwell Automation 2100-GK61 DeviceNet to SCANport - Manual (Page 96)

Publication 2100-UM001B-EN-P – January 2001
6-4 Using DeviceNet Explicit Messaging
Figure 6.2
Format of DeviceNet Messages
Format of 64-word Block Transfer
Write for Explicit Message Request
Format of 64-word Block Transfer
Read for Explicit Message Response
15 0 15 0
Transaction #1
Header
(3 words) TXID COMMAND TXID STATUS word 0
PORT SIZE PORT SIZE
SERVICE MAC ID SERVICE MAC ID
Transaction #1
Body (up to
29 words) CLASS SERVICE RESPONSE DATA
INSTANCE "
ATTRIBUTE "
SERVICE DATA "
" " word 31
Transaction #2
Header
(3 words) TXID COMMAND TXID STATUS word 32
PORT SIZE PORT SIZE
SERVICE MAC ID SERVICE MAC ID
Transaction #2
Body (up to
29 words) CLASS SERVICE RESPONSE DATA
INSTANCE "
ATTRIBUTE "
SERVICE DATA "
" " word 63