User`s manual

Data Management and I/O Words
102
Data Management for I/O Units
Addressing with
digital I/O units
The data exchange between the I/O unit and the bus adapter occurs 1:1.
With the TSX Momentum digital modules, the I/O points of the peripheral terminals
are always mapped according to the following principle:
Only words are mapped to (max. 2 for 32 inputs or 32 outputs).
The most significant word (MSW) is sent or received first.
The words sent from the bus adapter to the I/O unit (output words) represent the
output values and parameters.
The words sent from the I/O unit to the bus adapter (input words) represent the
input values and status information.
Example of data
management for
2 digital I/O units
Data management for the 170 ADI 350 00 (32 inputs) and 170 ADO 350 00 (32
outputs):
LSW = Least Significant Word
MSW = Most Significant Word
Addressing with
analog I/O units
The I/O data sent to and from the bus master is mapped onto the terminals of the
I/O units in the following way:
Each analog word is mapped onto a word.
The most significant word (MSW) is sent or received first.
The words sent from the bus adapter to the I/O unit (output words) represent the
output values and parameters.
The words sent from the I/O unit to the bus adapter (input words) represent the
input values and status information.
Word Input data 170 ADI 350 00 Output data 170 ADI 350 00
1 (LSW) Inputs 1 16 Outputs 1 16
2 (MSW) Inputs 17 32 Outputs 17 32