Rockwell Automation 1797-OE8H FLEX Ex HART Analog Modules User Manual - Manual (Page 39)

Publication 1797-6.5.3 - March 2006
Understand Configurable FLEX Ex Analog Module Features 2-9
Digital Fault State
The Digital Fault State feature determines how your I/O module reacts to
faults when a channel is used in digital mode. After a fault condition occurs,
the module may reset channel outputs or hold last state of the outputs.
Use your programming software to set the Digital Fault State bit to 0 to reset
outputs. Set to 1 to hold last state of the outputs after a fault occurs. This
feature is available on a per channel basis.
Data Format
You must choose a module data format in your user program. See
1797-OE8H Data Formats on page 2-10 for an explanation of each bit. Data
Formats 2, 5, 6, 8, 9, 10, 12 and 15 are not assigned.
When choosing a data format, remember the following:
• If a non-assigned Analog Data Format is selected, the module sets
Diagnostic Data to 2 for configuration failure and puts affected
channels affected in the corresponding fault state.
• An unconfigured module channel pair can be assumed to have the
default configuration Analog Data Format 0, 0 to 20 mA and Analog
Mode Fault State minimum range. If a non-assigned format is selected,
then the diagnostic 2 for configuration failure is set and the module
channel pair goes to the default fault state minimum range.
• If the configuration had been changed, from the default, and then it was
changed again to a non-assigned format, then the diagnostic bit 2 for
configuration failure is set and the module goes to the fault state for the
last valid configuration.
• Formats 13 and 14 are 2’s complement data formats, and require data to
the module in that form.
• Range: 0 to 15
• Default: 0
• Data Table Reference: data format, word 12 and 13, bits 0 to 3, bits 4 to
7