Panasonic FP-M Hardware, Руководство пользователя

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53
4-3. Wiring
Note:
24V (5V)
X0 X2 X4 X6 X8
XA
0V 0V
24V
(5V)
X1 X3 X5 X7 X9
XB
0V 0V 1
2
Sensor (5 V DC type)
19
20
Internal
circuit
Input
Vcc
+
0 V
–
Built-in DC
power output
terminal
• Some sensors do not allow for this type of use,
therefore check the specifications of the sensor
before wiring.
COM
LED-equipped
reed switch
FP-M
Input
terminal
20 V DC
or more
■
Wiring a LED-equipped reed switch
• When a LED is connected serially to an input
contact such as the LED-equipped reed switch,
make the voltage applied to the FP-M input circuit
greater than 20 V. In particular, take care when
connecting a number of switches in serial.
■
Connecting an input device with a
different voltage (ex.: a 5 V sensor, etc.)
• When connecting a device with a power supply
voltage different from the FP-M input voltage, such
as a 5 V sensor, connect in common to the built-in
DC power output terminal as shown below.
LED-equipped
limit switch
FP-M
C32T
type
Bleeder
resistor
COM
Input
terminal
R r
Sensor
Internal
circuit
FP-M
C32T
type
Bleeder
resistor
R
COM
Input
terminal
■
Wiring a two-wire type sensor
• If the input of the FP-M is not turned OFF because of
leakage current from the sensor, the use of a bleeder
resistor is recommended, as shown below.
■
Wiring a LED-equipped limit switch
• If the input of the FP-M is not turned OFF or if the
LED of the limit switch is kept ON because of the
leakage current, the use of a bleeder resistor is
recommended, as shown below.
R: Bleeder resistor (k Ω )
I
: Sensor’s leakage current (mA)
The OFF voltage of the FP-M input is 2.4 V, therefore,
select an R value so that the voltage between the COM
terminal and the input terminal will be less than 2.4 V.
• Control board (input impedance is 4.8 k Ω )
The bleeder resistor R is: R
11.52
4.8 I -2.4
• Expansion board (input impedance is 4.4 k Ω )
The bleeder resistor R is: R
10.56
4.4
I
-2.4
• The wattage W of the resistor is:
W=
(Power supply voltage)
2
R
In the actual selection, use a value that is 3 to 5 times
the value of W.
r: Internal resistor of limit switch (k Ω )
R: Bleeder resistor (k Ω )
The OFF voltage of the FP-M input is 2.4 V, therefore
when the power supply voltage is 24 V, select R so that
the current will be greater than I =
24 - 2.4
r
• Control board (input impedance is 4.8 k Ω )
The bleeder resistor R is: R
11.52
4.8
I
-2.4
• Expansion board (input impedance is 4.4 k Ω )
The bleeder resistor R is: R
10.56
4.4
I
-2.4
• The wattage W of the resistor is:
W=
(Power supply voltage)
2
R
Select a value that is 3 to 5 times the value of W.