Allen-Bradley DeviceNet 1756-DNB - FLEX I;O Module Input Mapping Scheme Example

B–9Scan List Example
Publication 1756–6.5.15 – July 1998
FLEX I/O Module Input Mapping Scheme Example
FLEX I/O Module Input Bytes
FLEX I/O module node address 22
The bits from each
FLEX I/O module are
mapped into the
communication module’
s
input image table.
1
The input image table is then
transferred to the host
application’s input data file.
Important: The communication
module only makes the data
available for the processor to
read. The communication
module does not move the data
to the processor.
What’s Happening?
1
2
The FLEX I/O module produces 6 bytes
of input data and consumes 4 bytes of
output data.
1 byte 1 byte 1 byte 1 byte 1 byte 1 byte
Module Status Input Bits from 1794-IB16 Ignore
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Host Platform
Input Data File
word 6
word 5
2
word 7
word 8
word 9
1756–DNB Communication Module Input Data Table
Input Map Segment
1794-ADN
adapter module
1794-IB16
input module
1794-OB16
output module
ABC
AA
B
word 123
B
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