Momentum Modbus Plus 170 PNT Series Guía de usuario Pagina 165

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Using the I/O Bus Port
870USE10110 July 2004 165
How I/O Bus Works with Momentum Components
Introduction This section describes how signals are passed and how data is transferred in an I/
O bus network.
How Signals are
Passed
I/O bus operates as a logical ring, with signals being passed by the master over a
remote bus cable to each slave device in series. The slaves return signals to the
master over the same cable.
How Data is
Transferred
The I/O bus functions as a logical shift register. The application's entire data stream,
originating at the master, is transferred serially from slave to slave down the remote
bus. Each slave regenerates the entire stream before passing it on.
Transmission
Speed
Data is transmitted at 500 kbits/s.
Amount of Data The number of 16 bit words in the data stream is dependent on the processor model.
Model Max Input Words Max Output Words
171 CCS 760 00 128 128
171 CCC 760 10 256 256
171 CCC 960 20 256 256
171 CCC 960 30 256 256
Note: Processors that support IEC are limited to a maximum number of 1408 used
I/O points, regardless of the number of modules.
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