Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 122)

122 Rockwell Automation Publication 1756-UM533C-EN-P - February 2011
Chapter 8 Getting HART Data By Using CIP MSG
Using MSG Instructions to
Access the HART Object Both categories of MSG are handled by the HART Object contained in the
module. There is one HART Object for each channel. Some CIP messages can be
sent to the Class Instance or Instance 0 of the HART object. Most MSGs are sent
to a specific instance of the HART object associated with a particular channel.
This table shows channel and instance correspondence.
These tables show service codes for CIP services.
Channel Instance
0 1
1 2
2 3
3 4
… …
15 16
Class Service Code Function
16#35D 16#4B Read Dynamic Variables
16#4C Read Additional Status
16#4D Get HART Device Information
Class Service Code Pass-through Messages
16#35D 16#4E Init
16#4F Query
16#50 Flush Queue
TIP The 16# means this number is Hex display style.