Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 20)

Publication 1797-6.5.1 - May 2005
2-4 Understanding Configurable FLEX Ex Analog Module Features
Data Format
You must choose a module data format in your user program. See Table 2.3 on
page 2-4 for an explanation of each bit. 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).
When using Table 2.3, remember the following:
• 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 0-20mA
• The data format selected interprets input readings and returns them to
the PLC
Table 2.3 1797-IE8 and -IE8NF Data Formats
Data
Format Format Resolution Input
Range
Module Data Processing Data Table Value
(interpretation) Count
per mA Error
Steps
0 0-20mA as
mA 0.1% of
0-20mA 0-22mA datatable = 1,000 (input) 0-22000
(0-22.000mA) 1000 with
error
steps
1 0-20mA as
% 0.2% of
0-20mA 0-22mA 0-11000
(0-110.00%) 500 with
error
steps
2 0-20mA
as
√%
0.19% of
0-20mA 0-22mA 0-10488
(0-104.88%) 524 with
error
steps
3 0-20mA as
unsigned
integer 0.03% of
0-20mA 0-20mA 0-65,535
(0-22mA) 3276 with
error
steps
4 4-20mA as
mA 0.1% of
4-20mA 2-22mA datatable = 1,000 (input) 2000-22000
(2.000-22.000mA) 1000 with
error
steps
datatable = 10,000
input (
20
)
datatable = 10,000
√
input
20
IF . . . Square_Root_Threshold
√
input
20
< 10,000
Else . . . datatable = 0
datatable = 65,535
input (
20
)