Mitsubishi Electric FX5 Serie Manuel D'installation page 4

● CPU module FX5UC- MT/DSS
– Source input wiring
FX5UC-32MT/DSS
24 V DC
COM0
X0
X1
FX5-C32EX/DS
COM0
X0
X1
For the power supply, please refer to the MELSEC iQ-F FX5UC Series User's Manual
[Hardware].
For an input device having a parallel resistance or a two-wire proximity switch,
a bleeder resistance may be required (see below).
Notes for connecting input devices
● Selection of contacts
The input current of these modules is 4 mA for 24 V DC. Use input devices
applicable to this minute current. If no-voltage contacts (switches) for large
current are used, contact failure may occur.
● Connection of input devices with built-in series diode
Depending on the base unit and input used, the voltage drop of the series
diode should be 2.4 V or less. When lead switches with a series LED are
used, up to two switches can be connected in series. Also make sure that
the input current is over the input-sensing level while the switches are ON.
● Connection of input devices with built-in parallel resistance
Use a device having a parallel resistance, Rp, of 13 k or more. If the resist-
ance is less than 13 k , connect a bleeder resistance R, obtained by the fol-
lowing formula:
6Rp
----------------- - k
R
13 Rp
– Wiring example for FX5UC-32MT/D (sink inputs only)
24 V
R
FX5UC-
32MT/D
X
Rp
COM
– Wiring example for FX5UC-32MT/DSS
Sink input wiring
FX5UC-
32MT/DSS
X
R
Rp
COM
24 V DC
Source input wiring
FX5UC-
32MT/DSS
X
Rp
R
COM
24 V DC
● Connection of 2-wire proximity switches
Use a two-wire proximity switch whose leakage current, I
when the switch is off. When the current is 1.5 mA or more, connect a blee-
der resistance R, determined by the following formula:
9
---------------- - k
R
I 1.5
L
– Wiring example for FX5UC-32MT/D (sink inputs only)
24 V
R
FX5UC-
I
L
32MT/D
X
3-wire type
sensor
COM
– Wiring example for FX5UC-32MT/DSS
Sink input wiring
FX5UC- I
L
32MT/DSS
X
2-wire
proximity
R
sensor
COM
24 V DC
Source input wiring
FX5UC- I
L
32MT/DSS
X
R
COM
24 V DC
Output wiring
L , is 1.5 mA or less
The outputs of the FX5 output modules and input/output modules are pooled
into groups of 16 outputs. Each group has two common terminals for the load
voltage. These terminals are marked "COM " for modules with transistor out-
puts of the sink type and "+V " for modules with source transistor outputs.
" " stands for the number of the output group e. g. "COM1".
Please note that the output wiring for the modules FX5-C EYT/D and FX5-C32ET/D
with sink outputs differs from the output wiring for the modules FX5-C EYT/DSS
and C32ET/DSS with source outputs.
Example of output wiring
Transistor output (sink)
DC power supply
Transistor output (source)
DC power supply
Notes for output wiring
● External power supply
For driving the load, use a power supply of 5 to 30 V DC that can output cur-
rent two or more times the rated current of the fuse connected to the load
circuit.
● Voltage drop
The voltage drop at ON of the output transistor is approx. 1.5 V. When driv-
ing a semiconductor element, carefully check the input voltage character-
istics of the applied element.
Protection of the outputs
● Protection circuit for load short-circuiting
When a load connected to the output terminal short-circuits, the printed
circuit board may be burn out.
Fit a protective fuse on the output circuit.
● Protection circuit of contact when inductive load is used
When an inductive (for example a relay or a solenoid) load is connected,
connect a diode in parallel with the load.
Transistor output (sink)
Fuse
Transistor output (source)
Fuse
Use a diode (for commutation) having the following specifications:
– Reverse dielectric strength: 5 to 10 times the load voltage
– Forward current: Load current or more
Load
Y0
Y1
Fuse
COM0
COM0
Load
Y0
Y1
+V0
Fuse
+V0
Inductive load
Y
COM0
COM0
PLC
Inductive load
Y
+V0
+V0
PLC