Dispersed Installation; Figure 3-3 An Example Of Dispersed Installation - Hitachi HSC-2100 Hardware Manual

3.3.2 Dispersed installation

As shown in Figure 3-3, dispersed installation installs the LPU or CPU unit of a programmable
controller in one cubicle and the I/O units in another separate cubicle(s). This installation style
is used when the I/O units of a programmable controller need to be installed in a distant
location(s) from its CPU unit or LPU unit.
Power distribution panel
and other circuitry for
programmable controller
Grounding (Class D) other
than the grounding for
programmable controller
Power cables
NFB
I/O unit
H
N
LG
NFB
I/O unit
H
N
LG
Terminal block (TB)
Electrostatic-shielded
insulating transformer
Class D grounding for programmable controller

Figure 3-3 An Example of Dispersed Installation

3 INSTALLATION AND MODULE MOUNTING
3-5
NFB
LPU or CPU unit
H
N
LG
Terminal block (TB)
Electrostatic-shielded
insulating transformer
Class D grounding for
programmable controller
Remote I/O cable
The wiring, insulation, and grounding
methods used are the same as those
used in the concentrated installation
of a programmable controller.
For details, see Subsection 3.3.1,
"Concentrated installation."