Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 113)

Rockwell Automation Publication 1756-UM533C-EN-P - February 2011 113
Configure the Modules with RSLogix 5000 Software Chapter 7
Data in the Input Tags When HART data is included in the input tag and a channel has HART enabled,
the ControlLogix HART I/O module automatically collects HART data and
places the most common Dynamic Process Data and Device Health information
directly in the input tag.
See Appendix A for a complete listing of the fields in the input, output, and
configuration tags.
An overview of the HART data includes the following:
• HART Faults - At the beginning of the input tag included even if you click
Analog Only input data tag format. These faults indicate that HART
communication is not successful or that the field device is reporting a
problem such as Device Malfunction, Loop Current Saturated or PV out
of Limit. For example, Ch0HARTFault is set if Ch0Config.HARTEn is 0
or if no HART Field Device is attached.
• HART Device Status - A collection of status indicators that reflect the
HART communication details and overall device health.
– Init - Module is searching for a HART device.
– Fault - HART communication is not successful. If this is 1 and
Initializing is 0, probable cause is HART is not enabled on this channel.
– Message Ready - A HART pass-through message reply is ready to be
collected by using the Pass-through Query CIP message. See Chapter 8
for information on using CIP MSGs to access HART data.
PV In HART, the Primary Variable (PV) is signaled on the 4… 20 mA analog channel.
It can also be read back using HART messages. In many HART devices, the
relationship between the PV and the analog signal can be adjusted. This area
displays the following Process Variable attributes:
• Upper Range Value - to use the same engineering units in your Logix
controller as in the Field Device, enter this value in High Engineering on the
Configuration tab.
• Lower Range Value - to use the same engineering units in your Logix
controller as in the Field Device, enter this value in Low Engineering on the
Configuration tab.
• Damping
• Transfer Function - describes how the HART field device transforms the signal
on its transducer to the PV. Usually Linear, but sometimes Square Root (for
example, for flow), or other relationships.
Revision Displays the following revision attributes.
• Universal - this denotes the version of the HART specification to which the
device conforms.
• Device
• Software
• Hardware
Table 29 - HART Device Info Tab
Parameter Description