Rockwell Automation 1798-IB4 FlexArmor User Manual - Manual (Page 16)

Publication 1798-UM001B-EN-P - November 2002
2-2 How Communication Takes Place and I/O Image Table Mapping
For example, a 4 point discrete input module will have up to 2 read
words and 1 write word.
Check the I/O map for each module for the exact mapping.
About 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 the installed I/O modules. The Input data from slot 0 is first after
the status word, following by Input data from slot 2, and so on up to
slot 7.
4-point Discrete Input Module
I/O Image
Input Size
Output Size
1 or 2 Words
0 or 1 Words
Module Image
Inputs
Not used
Not used
Delay
Time Delay
Time
...
... ...
... ...
DeviceNet Adapter
Network READ
Network WRITE
Read Data
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
Write
I/O Module
Slot 0 I/O Module
Slot 1 I/O Module
Slot 7