Polled i/o structure, Adapter input status word – Rockwell Automation 1794-XXXX FLEX I/O High-Density Analog Modules User Manual
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Publication 1794-UM062A-EN-P - September 2012
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Communicate With Your Module
Polled I/O Structure
Output data is received by the adapter in the order of the installed I/O modules.
The Output data for Slot 0 is received first, followed by the Output data for Slot
1, and so on up to slot 7.
The first word of input data sent by the adapter is the Adapter Status Word. This
is followed by the input data from each slot, in the order of installed I/O
modules. The Input data from Slot 0 is first after the status word, followed by
Input data from Slot 2, and so on to slot 7.
Adapter Input Status Word
The input status word consists of:
• I/O module fault bits — 1 status bit for each slot
• node address changed — 1 bit
• I/O status — 1 bit
Adapter status
Slot 0 input data
Slot 1 input data
Slot 7 input data
Slot 0 output data
Slot 1 output data
Slot 7 output data
Read data
Write data
Network READ
Network WRITE
FLEX I/O adapter
slot 0
I/O module
Read
Write
slot 1
I/O module
slot 7
I/O module
...
...
...
...
...
46062
15
Bit:
0
1
2
3
4
5
6
7
8
10 through 15
I/O Module Fault Bits
Node Address Changed Bit
Slot 0
Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6
Slot 7
9
I/O State Bit
Not Used
46063