YOKOGAWA FA-M3V e-RT3 Plus, Hardware Manual

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C1-2
IM 34M06C11-01E
 Concept of Unit
 Main Unit
A unit in which the F3SP08-0P or F3SP08-SP sequence CPU module is installed is
referred to as a main unit. Consequently, the F3SC22-
□□
or F3SC23-
□□
itself
serves as the main unit.
 Subunit
Subunits are used to increase the number of I/O ports. A maximum of seven subunits
can be added to the Value II of the FA-M3 system to deal with up to 2048 I/O points.
 Increasing the Number of I/O Points Using Fiber-optic
FA-bus Modules
You can install fiber-optic FA-bus or FA-bus type 2 modules in both main and subunits
and connect them with fiber-optic cables. This enables the distributed arrangement of
remote I/O points, increase in the number of I/O points, and control of I/O modules via
high-speed, noise-immune communication. The fiber-optic FA-bus or FA-bus type 2
module may be installed in either slot 3 or slot 4.
Note
■ Example of increasing the number of I/O points using FA-bus type 2 modules
As with fiber-optic FA-bus type 2 modules, the number of I/O points can be increased
using FA-bus type 2 modules.
FA-bus type 2 modules use shielded twisted-pair cables for the connection between
subunits.