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How Does the Scanner
Relate to I/O
Understanding I/O Scanner Concepts
This chapter explains basic concepts and provides an overview of the
operation of the PC I/O scanner. After reading this chapter you should
understand how:
information moves between your program and the outside world
your program can issue commands to affect operation of the scanner
The scanner uses the remote I/O protocol to communicate with
Allen-Bradley I/O modules. You don't have to know the specifics of the
protocol to use the scanner with the I/O modules, but you do need to know
a few terms.
The scanner is an Allen-Bradley communication card, which requires a
16-bit backplane, that you install in a compatible host computer (or host).
PC Hardware
Host
Processor
(e.g., 80486)
PC
Chapter
1
I/O Hardware
Remote I/O
I/O Protocol
Module
1-1
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