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3170-PDP ♦ FLEX Platform How Communication Takes Place and I/O Image Table Mapping
FLEX I/O™ PROFIBUS Adapter
Page 20 of 152 ProSoft Technology, Inc.
August 23, 2007
For example, a 16 point discrete input module will have up to 2 read words and 1
write word.
Module Image
Inputs
Input Size
Output Size
1 or 2 Words
0 or 1 Word
I/O Image
Not used
16-point Discrete Input Module
Delay
Time
Not used
Delay
Time
Refer to the I/O map for each module for the exact mapping.
3.1 Polled I/O Structure
The first word of output data sent by the adapter is the Adapter Status Word.
Output data is received by the adapter in the order of the installed I/O modules.
The Output data for Slot 1 is received first, followed by the Output data for Slot 2,
and so on up to slot 8. All bits in the output status word are reserved
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 1 is first after the status word, followed by
Input data from Slot 2, and so on up to slot 8.
Adapter Status
Slot 1 Input Data
Slot 2 Input Data
Slot 8 Input Data
Slot 1 Output Data
Slot 2 Output Data
Slot 8 Output Data
Read Data
Write Data
Network READ
Network WRITE
PROFIBUS Adapter
Slot 1
I/O Module
Read
Write Slot 2
I/O Module
Slot 8
I/O Module
...
... ...
...
...
Adapter Status
3.1.1 Adapter Input Status Word
The input status word consists of:
ƒ
I/O module fault bits – 1 status bit for each slot