Momentum Modbus Plus 170 PNT Series Guia do Utilizador descarregar pdf (Página 120)

100

101

Using the I/OBus Port

108

870 USE 101 00 V.2.2

How I/OBus Works

Introduction

I/OBus allows a Momentum CPU to assume bus master capabilities over as many

as 256 slave devices over an Interbus cable.

How Signals Are

Passed

I/OBus 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/OBus 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. As a

slave handles the stream data, it extracts the portion that is assigned to it and adds

any output data to the stream.

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