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6.
LOADING AND INSTAUTION
/MELSEC-A
6.
LOADING AND
INSTAUTION
This section gives procedures and cautions to be used for loading
and installation of system modules to improve system reliability
and make the most of system functions.
6.1
Fdl-rrfs
CirCUit
Conduct system designing considering the following points and
prevent mis-input from remote
I/O
modules and remote terminal
modules.
(a) Measure against mis-input
at
power on and
off
(b)
Measure against mis-input due to momentary power failure of
remote
I/O
modules or remote terminal modules (See Section
2.2,
(6)
for details.)
The system may malfunction when external power supply or the
PC module causes
a
failure.
To
prevent
a
circuit failure from developing to malfunction of the
whole system and to realize
a
fail-safe system, construct those
circuits of which failure will lead to breakage or accidents of
machine equipment (e. g., emergency stop circuit, protection
circuit, interlock circuit) outside the
PC.
6.2
Installation Environment
Never install the
A2C
system modules in the following environ-
mental conditions.
(1)
Locations where ambient temperature is outside
the
range
0
to
55'C.
(2)
Locations where ambient humidity is outside the range of
10
and
90%
RH.
temperature changes.
I
(3)
Locations where dew condensation takes place due to sudden
(4)
Locations where there are corrosive gasses and combustible
gasses.
(5) Locations where there is
a
high level of conductive powder
such as dust and iron filings,
oil
mist, salt, and organic solvent.
(6)
Locations exposed to the direct rays of the sun.
(7)
Locations where strong power and magnetic fields are gener-
ated.
(8)
Locations where vibration and shock are directly transmitted
to the main unit.
".
IB
INAl
66238A
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