Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 133)

Rockwell Automation Publication 1756-UM533C-EN-P - February 2011 133
Getting HART Data By Using CIP MSG Chapter 8
HART Module Scanning
Diagram with Pass-through
Messages When HART pass-through messages are being sent, the normal data acquisition
sequence is modified as shown in the diagram. In this case, the Pass-through is
configured to send one pass-through message for each channel scanned.
It can be configured for lower priority on the Configuration tab of the
Module Properties dialog box.
Yes
Update Input Tag
Device in
Scan List?
Send Command
3 or 9 to Read
Dynamic
Process Variable
Reply?
Read Configuration
Information, Such as
Tag, Units, Range
Put Device in Scan List
Send Command 0
Read Unique Identifier
New
Configuration
Indicated?
Remove
Device from
Scan List
Read
Configuration
Information,
Such As Tag,
Units, Range
Signal Configuration
Changed in Input Tag
Go To First Channel
Next Channel
Last
Channel?
No
Signal Configuration
Changed in Input Tag
Yes
Reply?
Yes
No
Yes
Process 1 Pass-
through Message
No
No
No
Yes