Rockwell Automation 1797-OE8H FLEX Ex HART Analog Modules User Manual - Manual (Page 34)

Publication 1797-6.5.3 - March 2006
2-4 Understand Configurable FLEX Ex Analog Module Features
Data Format
You must choose a module data format in your user program. Formats 8, 9, 10
and 15 are not used. If they are selected for a channel quad, a configuration
fault will occur and will be reported as Diagnostic Data 2. All data for that
channel quad will be set to zero (0).
• Formats 5, 12, 13 and 14 are 2’s complement data formats, and will
return data in that form.
• 12 Formats are available
• Default format is 0 to 20 mA
• The data format selected interprets input readings and returns them to
the PLC controller
Table 2.3 1797-IE8H Data Formats
Data
Format Format Resolution Input
Range
Module Data Processing Data Table Value
(Interpretation) Count
per mA Error
Steps
0 0…20 mA
as mA 0.1% of
0…20 mA 0…22 mA Datatable = 1000 (input) 0…22000
(0…22.000 mA) 1000 With
error
steps
1 0…20 mA
as % 0.2% of
0…20 mA 0…22 mA 0…11000
(0…110.00%) 500
2 0…20 mA
as
√%
0.19% of
0…20 mA 0…22 mA 0…10488
(0…104.88%) 524
3 0…20 mA
as
unsigned
integer 0.03% of
0…20 mA 0…20 mA 0…65535
(0…22 mA) 3276
4 4…20 mA
as mA 0.1% of
4…20 mA 2…22 mA Datatable = 1000 (input) 2000…22000
(2.000…22.000
mA) 1000
Datatable = 10000
input (
20
)
Datatable = 10000
√
input
20
IF…Square_Root_Threshold
√
input
20
< 10000
Else…datatable = 0
Datatable = 65535
input (
20
)