4
●
Wiring Route
For the following combination, since signal types, properties, or levels
of the signal differs, in principle different cables should be used or
different routes should be used. Otherwise, the S/N (signal-to-noise
ratio) resulting from electrical induction can fall. Also, by classifying
and arranging the wiring, later maintenance or system changes can
be simplified.
1
Power lines and signal lines
2
Input and output signals
3
Analog and Digital Signals
4
High level and low level signals
5
Communication lines and Power line
6
DC signals and AC signals
7
High fre
q
uency aparatus (inverters etc.) and signal lines (communication)
●
Wiring Method
1
Isolate signal cables with different characteristics when routed in
the same duct.
2
Routing more than one power line in the same duct should be
avoided as much as possible. Where this cannot be avoided, place
a partition in the duct and ground it.
(See Figure 9)
3
When using conduits in the course of wiring, the wires from one
circuit should not place wires for a single circuit in separate
conduits as the pipes heat up.
(See Figure 10)
4
Do not install power cables and signal cables in parallel as they will
adversely affect each other.
5
When high-voltage devices are installed in the panel, due to noise,
this should be separated as much as possible from high voltage
and power lines when wiring.
(See Figure 3)
6
Install the PLC at least 200 mm from any high voltage or power
lines, or make sure that the high current and power lines are
contained within metal tubing, and ground to a resistance of 100 W.
(See Figure 11)
●
Other Precautions
1
I/O modules have plus and minus commons, so be careful of
polarity when wiring.
2
The outside of a fibre optic cable looks similar to a regular
communication or power cable, but inside the cable there is the
fibre and protective tension members and separators, so care
should be taken when using them. Installation should be performed
by the prescribed or standard methods, and care should be taken
to not apply excessive shock, bend, twist, or excessive pulling.
The following manuals have been prepared for wiring using fiber optic
cables.
1
SYSMAC C/CV Series Hard Plastic Clad Fiber
Manual for laying Fibre Optics Cables (H-PCF)
(Manual No. W156-E1)
2
Controller Link Unit Fibre Optical Ring
User Manual (Manual No. W370-E1)
■
Grounding
●
Purpose of Grounding
There are two purposes for grounding.
1
Protective grounding which prevents electrocution to people by
maintaining an grounding against leakage, induction and
occasional accidents.
2
Grounding, including that to prevent external noise or noise which
emenates from other devices or e
q
uipment, or noise that could
disturb other devices or e
q
uipment, and that is necessary to protect
device and system functions.
These grounding issues may need to be resolved through experience
and experimentation. It is important to take great care and
consideration before performing the grounding.
Fig
u
re 9. I
s
ol
a
ting
S
ign
a
l
a
nd Power C
ab
le
s
(
a
)
(
b
)
(c)
(d)
S
ign
a
l C
ab
le
S
ign
a
l C
ab
le
S
ign
a
l C
ab
le
Power C
ab
le
Power C
ab
le
Power C
ab
le
P
a
rtition
S
ign
a
l
C
ab
le
(A Gro
u
p
S
ign
a
l
C
ab
le
(C Gro
u
p)
S
ign
a
l
C
ab
le
(B Gro
u
p)
Fig
u
re 10. P
a
r
a
llel
us
e of Electric
a
l Wire
s
(
s
ingle ph
as
e)
Correct U
s
e
Correct U
s
e
Power
Incorrect U
s
e
Power
Power
Lo
a
d
Lo
a
d
Lo
a
d
Fig
u
re 11. Ex
a
mple of I
s
ol
a
ting PLC from Power Line
PLC
Met
a
l t
ub
e
PLC
200 mm
200 mm
High-volt
a
ge power p
a
nel
Power Line
Power Line
Le
ss
th
a
n
100 W
