Spectrum Controls 1756sc-OF8H Series A - Manual (Page 92)

78 ControlLogix ™ Analog HART Modules
Note: The ladder in figure 7.6 can be found in the project sample file
located on our website at (www.spectrumcontrols.com)
Module Specific Commands Module Specific Commands Module Specific Commands Module Specific Commands Module Specific Commands
Both the HART input and output modules provide module specific
commands. The commands are passed to the module using unconnected
messaging. Unconnected messaging simply refers to the ability to
communicate to the module, over a control network (i.e. CNET, Ethernet,
Etc.), without the need of the owner PLC. However, an unconnected
message can be sent from a PLC to the HART module using the MSG
ladder instruction. See figure below.
Figure 7.7 (Message Instruction)
The MSG instruction must be configured correctly to establish
communication to the HART module. Each module specific command
uses the same generic CIP message configuration. The generic CIP
message configuration used by the HART input and output module is
shown in the table below.