User Manual

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 261
Appendix E
Explicit Messages
Introduction
Receiving Explicit Messages
Sending an explicit message from a standard DeviceNet master to the
SmartGuard controller enables reading or writing any specified data or
parameters of the SmartGuard controller. The controller performs according to a
command sent from the master and returns a response.
A read command reads the SmartGuard local I/O or safety slave I/O area
allocated to the SmartGuard controller from the master.
The basic format of the command and response are shown below.
Figure 88 - Command Format
Figure 89 - Normal Response Format
Figure 90 - Error Response Format
Command Format
The Destination Node Address specifies, in 1 byte hexidecimal, the node address
of the data to be read.
For commands, specify 4B (hex) for the Service Code.
Class ID is always 0356 for a SmartGuard controller.
Topic Page
Receiving Explicit Messages 261
Send Explicit Messages 264
Accessing Controller Parameters By Using DeviceNet Explicit Messages 265
Destination Node
Address
Service Code Class ID Instance ID Offset Address Data Size
4B 03 56
Number of Receive Bytes Originating Node Address
Service
Code
Read Data
CB
Number of Receive Bytes
Originating Node Address
Service
Code
Error Code
00 04 94