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Wired Remote I/O Systems
Link Adapters
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The other basic type of Remote Terminal consists of two parts: a Remote
Interface and an I/O Block. The Remote Interface functions to transmit input
or output signals between the Remote I/O System and the I/O Block. I/O
Blocks enable easy removal and replacement of individual relays, including
relays with a large switching capacity, making them ideal for controlling
large motors, heavy equipment, etc. An I/O Block is available for either 16
input points or 16 output points.
Remote Interface
The types of field devices that can be handled is the only functional differ-
ence between G72C Remote Terminals and Remote Interfaces connected to
I/O Blocks. There is no difference that affects the software operation of the
Remote I/O System. In the remainder of this manual, the term Remote Termi-
nal will be used to refer collectively to both types of Remote Terminals unless
there is a reason to specify one or the other.
Converting Link Adapters can be used to create optical cable links within an
otherwise Wired System. The connections to Masters, Slaves, and Remote
Terminals are still wire cable; the optical connections are only between Link
Adapters. Refer to 2-4 Optical Connections in Wired Systems for details.
Branching Wired Remote I/O Systems through Branching Link Adapters is
not possible.
Input Block
Section 1-2
Replaceable
relays
Terminals
5
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