45
Appendix 3. Frequently Asked Questions
1
OVER
VIEW
OF T
RAN
SITIO
N
FR
OM
F S
ERIE
S (F1
, F1
J,
AND
F2
) TO
FX
3 SE
RIES
2
OV
ER
VIE
W
OF
P
RO-
GR
AM
CO
NV
ER
SIO
N
US
ING
FX
-20
P-E
3
CONVE
RSION RU
LES
FOR
THE
PRO
GR
AM
CONVE
RSION F
UNCT
ION
A1
D
isc
on
tinu
ed
M
ode
ls [
Pro
gr
am
-
m
abl
e C
ont
roll
er
]
A2
R
el
ev
ant
M
anuals
A3
F
requent
ly
A
sked Q
u
es-
tio
n
s
*1 FX
1N
-BAT can be installed as an option.
*2 FX
3U
-32BL can be installed as an option.
Power supply, input, and output
If the programmable controller is
constantly supplied with electric-
ity, will there be a voltage drop in
the battery for memory backup?
The battery for memory backup is spent regardless of whether the
programmable controller is turned on or off.
Is it okay to perform battery
replacement while the program-
mable controller is turned on?
Turn off programmable controllers before replacing batteries.
It depends on the programmable controller series, but for FX
2N
and
FX
2NC
programmable controllers, data is retained for 20 seconds
even if they are turned off and the battery is removed, so replace
the battery during this time.
Which programmable controllers
use batteries?
F/F
1
/F
1J
/F
2
/FX
1
/FX
2
/FX
2C
/FX
2N
/FX
2NC
/FX
3U
/FX
3UC
series.
The FX
0
, FX
0S
, FX
0N
, FX
1S
, FX
1N*1
, FX
1NC
, and FX
3G*2
series do
not use batteries.
I want to install an optional battery
in the FX
3G
programmable con-
troller.
The FX
3U
-32BL battery model can be installed in the FX
3G
pro-
grammable controller.
After installation, set "Battery mode: Use battery" in the Parameter
window of GX Works2.
The shape of the battery installed
in the programmable controller is
different from that of F
2
-40BL pro-
vided as a spare part.
F
2
-40BL, which is installed in the programmable controller, comes
with a printed circuit board, but the battery with no circuit board
provided as a spare part also has the same function.
Q
A
How is the mount-type 24VDC
power supply for sensors con-
nected to a programmable con-
troller?
Connect the "0V (-)" of the 24VDC power supply to the COM termi-
nal (on one side of the built-in power supply of the programmable
controller) in the input terminal of the programmable controller.
Do not connect the "24
+
" terminal of the external 24VDC power
supply to the "24
+
" terminal of the programmable controller.
Can the power of the 24VDC
input (sink input) of the program-
mable controller be supplied from
externally?
In the FX series, only DC power supply type programmable con-
trollers can use an external power supply.
Is a noise filter required for the
power supply of the programma-
ble controller?
It is not required, unless otherwise stated in the manual and other
documents. However, if there is a lot of noise in your operating
environment, using a filter, isolation transformer, or other similar
tools for noise removal may be effective as a way to reduce exter-
nal noise.
Do I have to connect the ground
terminal of the programmable
controller?
Perform grounding for safety purposes. However, incomplete com-
mon grounding in a control panel, common grounding with a heavy
electrical system, or other similar acts may cause product malfunc-
tion or failure.
The power supply lamp of the
programmable controller was
working properly, but it does not
light up or keeps flashing now.
Remove the wiring of the [24
+
] (service power supply) terminal,
and check if the problem has been resolved.
If it has, the service power supply capacity may be exceeded due
to load short-circuit and excessive load current, and the protection
function may be triggered.
If it has not been resolved, send an investigation request to Mitsubishi
Electric System Service.
How are I/O numbers assigned?
I/O numbers of FX programmable controllers are assigned in
octals. The assignment of octals are as follows: 0 to 7
→
10 to 17
→
20 to 27 ... 70 to 77
→
100 to 107.
Where is the
+
24V terminal of
extension blocks connected?
For AC power supply type, connect to the terminal on the 24
+
side
of the main module.
For DC power supply type, connect to the
+
24V side of the external
power supply. For details, refer to the manual of each product.
There are multiple input COM ter-
minals. Can I use any of them?
The input COM terminals are connected in the programmable con-
troller and all have the same signal.
Q
A
Summary of Contents for FX Series
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