YOKOGAWA F3LR02-0N, User Manual

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B3-1
IM 34M06H45-01E 7th Edition : Aug.30, 2019-00
B3. Fiber-optic FA-bus Type 2 System
Configuration
B3.1 What Is a Substation?
A Fiber-optic FA-bus Type 2 system contains the following elements.
Element Description
Station A unit installed with a Fiber-optic FA-bus Type 2 module.
Main unit
(master station)
A unit installed with a CPU module.
Subunit
Slots without a CPU module installed and are connected
to a main unit via a Fiber-optic FA-bus Type 2 modules for
system expansion. In a split-unit configuration, one
subunit consists of multiple substations.
Substation
The smallest unit in a Fiber-optic FA-bus Type 2 system.
Whether it is equivalent to a subunit depends on whether
we have a split-unit configuration.
In a split-unit configuration, a substation is a division of a
subunit. Without splitting, a substation is equivalent to a
subunit.
The following table lists some terminologies on system configuration used in this
manual.
Terminology Meaning
Terminal station Substation at the end of a daisy chain.
Station address
General reference to a unit number and slot number
assigned to a station
Master station module
Fiber-optic FA-bus Type 2 module installed in a master
station
Substation module Fiber-optic FA-bus Type 2 module installed in a substation
Terminal station module
Fiber-optic FA-bus Type 2 module installed in a terminal
station