Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 26)

Publication 1797-6.5.1 - May 2005
2-10 Understanding Configurable FLEX Ex Analog Module Features
Data Format
You must choose a module data format in your user program. See Table 2.4 on
page 2-11 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”, 0-20mA 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 on the other hand, 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: 0-15, See Table 13
• Default: 0
• Data Table Reference: data format, word 12 and 13, bits 0-3, bits 4-7
If data is sent to the module which is out of range, the value will be clipped
and Diagnostic Data will be set to “11” data out of range. See the graphic
below.
0 4 8 12 16 20 24
-4.000
0.000
4.000
8.000
12.000
16.000
20.000
Output mA
datatable
Diagnostic Data error
11=data out of range
Diagnostic Data error
11=data out of range