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Remote I/O Systems Section 1-1
A Remote I/O System directly involves only one PC and the program in it and
through it a large number of I/O points can be controlled a greater distance
from the PC. This is achieved by mounting a Remote I/O Master Unit to the
CPU Rack to control I/O points located possibly many kilometers away. Each
Master serves as a ‘switching point’ for controlling all of the I/O points ac-
cessed through it. These I/O points are accessed through the Master, not
controlled by it. All I/O control comes from the program in the CPU Unit.
More than one Master can be mounted to a single PC, with each Master
forming the starting point of a Remote I/O Subsystem, i.e., a Remote I/O
Subsystem includes one Master plus all of the Remote I/O Units controlled
through it.
The Remote I/O Units that can be included in each Subsystem depend on
the specifications of the Master. Masters are available either with optical or
wire specifications. Optical Remote I/O Systems transfer data through opti-
cal fiber cables to enable the greatest transmission distance and the great-
est resistance to electrical noise. Wired Remote I/O Systems use wire ca-
bles which don’t offer as great a distance as Optical Subsystems, but do
greatly reduce the burden of wiring remote I/O and afford greater resistance
to noise than independently wired I/O points. Both types of Master can be
mounted to the same PC to meet specific distance and noise-resistance re-
quirements.
Master
on Rack
Label printer
Remotely Controlled I/O Devices
Glue coater
PC
Optical and
Wired Masters
on Rack
Auto welder
Conveyer
Packing machine
Optical Subsystem
Wired Subsystem
Polisher
PC
All Remote I/O Systems consist of at least one Remote I/O Master Unit con-
nected in series to one or more Units accessed through it. One of these Units
that is common to most Remote I/O Systems is a Remote I/O Slave Unit.
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