YOKOGAWA FA-M3V e-RT3 Plus, Hardware Manual

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B1-1
IM 34M06C11-01E
B1. System Configuration
B1.1 System Configuration
 Basic Configuration
The FA-M3 Value version (F3SC21-1N) consists of the following components.
- F3BU04-0N base module
- F3SP05-0P sequence CPU module with a power supply and memory
- F3WD64-3N I/O module
Should the FA-M3 Value version fail, it can be fixed by replacing the failed module only.
Install the F3SP05-0P sequence CPU module in the leftmost slot of the F3BU04-0N
base module and the F3WD64-3N I/O module in slot 2. The remaining slots 3 and 4 are
reserved for a variety of I/O modules available for use with the FA-M3 series.
A slot number consists of three digits of which the third digit is the unit number. The unit
number 0 is allocated to the main unit.
001 002 003 004
Main unit
(F3SC21-1N)
FB010101.VSD
I/O module I/O module
Slot number 
F
3S
P05
F
3WD64
Figure B1.1 Slot Numbering
 Concept of Unit

Main Unit
A unit in which the F3SP05-0P sequence CPU module is installed is referred to as a
main unit. Consequently, the F3SC21-1N 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 version 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.