Rockwell Automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Modules - Manual (Page 73)

Publication 1794-UM065B-EN-E - September 2010
1794-IF8IH and 1794-OF8IH Configuration 61
Byte Order (2 of 2 bits)
Selects the byte order of module's data.
Note: The MSW and EDT words (Words 0, 1 and 15) of the Primary Input
Data Table are not swapped. All other Primary Input Data and Configuration
Data are adjusted according to the following chart:
The purpose of this parameter is to allow this module to operate properly
within data networks or systems utilizing various byte orders, across all data
types (e.g. Boolean data to 32 bit float data).
Upon receiving the configuration assembly the module must inspect Byte
Order to determine how to interpret the configuration assembly.
Two sets of Byte Order bits are provided since the module will not know at
power-up and configuration reception what Endian format the configuration
data he is receiving is in. No matter what the format though these two, two bit
sets always convey correct information to the module. Both sets must match
each other for the module to accept the configuration and begin processing it
… … … … … … …
30% 30 1 1 1 1 0
31% 31 1 1 1 1 1
1794-OF8IH Byte Order Configuration
Byte Order
Group B Byte Order
Group A
Bit 9 Bit 8 Bit 1 Bit 0 Description
0 0 0 0 Little Endian Format (default) — all data entries in
true Little Endian format
1 0 1 0 Word Swap — word swap only values requiring
more than one word, for example, 32 bit float
values.
0 1 0 1 Byte Swap — byte swap all words in data table.
1 1 1 1 Big Endian Format — all data entries in true Big
Endian format.
IMPORTANT
Byte Order can not be changed using RSLogix 5000 software.
RSLogix 5000 uses the default Byte Swap setting.
1794-OF8IH HART Current Ratio
HART Current
Ratio Limit Decimal
Value Bits
15 14 13 12 11
7 6 5 4 3