
3–4 Communicating with FLEX I/O Modules
Publication 1794ĆUM009D-EN-P - April 2004
Input Word
Output Word
Standard Mode
Input Word
Output Word
Compact Mode
16Ćpt Density
16 bits of input OR
16 bits of output available
Input Word
Output Word
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
16 bits of input AND
16 bits of output available
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
Input Module Example Output Module Example
Digital I/O Modules
Compact Mode
8Ćpt Density
8 bits of input OR
8 bits of output available
Note: If 16Ćpt or 32Ćpt modules are used in 8Ćpt
compact addressing, only the information in
the lowest byte (8 bits) will be sent to the
processor.
Input Word 0
Input Word 1
Standard - 32 Mode
8 Bits 8 Bits
8 Bits8 Bits
32 bits of input AND
32 bits of output available
8 Bits 8 Bits
8 Bits8 Bits
Input Module Example
Output Module Example
Output Word 0
Output Word 1
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
Input Module Example Output Module Example
Note: If 32 pt. modules are used in standard
mode, only the lower word (16 bits) will be sent
to the processor. All 32 bits of the 32-pt
combo module are available.
Note: If 32 pt. modules are used in 16 pt.
compact mode, only the low word (16 bits)
will be sent to the processor.
Input Module Example Output Module Example
Input Word
Output Word
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
Complementary Mode
16Ćpt Density
16 bits of input OR
16 bits of output available
Input Word
Output Word
8 Bits 8 Bits
8 Bits8 Bits
8 Bits 8 Bits
8 Bits8 Bits
Primary Chassis
Complement Chassis
16Ćbit Input modules complemented by 16Ćbit output modules
Note: If 32Ćpt modules are used in 16Ćpt complimentary addressing,
only the information in the lower word will be sent to the processor.
Input Module Example Output Module Example
Input Module Example Output Module Example
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