Rockwell Automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Modules - Manual (Page 24)

Publication 1794-UM065B-EN-E - September 2010
12 Configurable FLEX I/O Analog Module Features
• 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
• 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.
Example of Analog Format 14 and Data Clipping Performance.
1794-OF8IH Data Formats
Data
Format Format Resolution Full
Output
Range
Module Data Processing Data Table Value
(Interpretation) Count per
mA/
Resolution Analog Fault
State
0 mA as
0…20 mA 0.1% of
0…20 mA 0…22 mA 0…22000
(0…22.000 mA) 1000/
1.0 µA Min=0 mA
Max=22 mA
hold
Last=hold
FS value
1 % as
0…20 mA 0.2% of
0…20 mA 0…22 mA 0…11000
(0…110.00%) 500/
2.0 µA Min=0 mA
Max=22 mA
hold
Last=hold
FS value
2 0…20 mA — 0…22 mA Not Assigned
3 Unsigned
integer as
0…20 mA 0.03% of
0…20 mA 0…20 mA 0…65535
(0…20 mA) 3276/
0.305 µA Min=0 mA
Max=20 mA
hold
Last=hold
FS value
Diagnostic Data error 11
= data out of range
Diagnostic Data error 11
= data out of range
0 4 8 12 16 20 24
Output mA
datatable
20.000
16.000
12.000
8.000
4.000
0.000
-4.000
Output =
datatable (
1000
)
Output = 20
datatable (
10000
)
Output = 20
datatable (
65535
)