Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Manual de usuario Pagina 185

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1 Publication 1797-6.5.3 - March 2006
Appendix
F
FLEX Ex HART Modules Network Messaging
What This Appendix
Contains
This appendix discusses:
How to communicate with the FLEX Ex HART modules via the MSG
or CIO instruction
The differences between Attributes and Assembly Indexes
Enhancements to the HART frame
Communication
The messaging between the controller and the HART I/O module is handled
via MSG or CIO instructions, depending on the controller type. These ladder
logic instructions need specific details for proper operation. In particular, they
need four items:
Class
The Class value for FLEX Ex is 7D hex.
Instance
The Instance is a number between 1 and 8. This number indicates the
module location relative to the adapter module. Use 1 for the module
connected directly to the adapter.
Service
The Service value is 0E hex for Get Attribute Single and 10 hex for Set
Attribute Single. Use a Service value of 0E hex to read data from the
adapter and 10 hex to write data to the adapter.
Attribute
The Attribute value is based on the Attribute Values table.
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