Panasonic FP3 - Page 46

FP3 MEWNET-TR
Chapter3-2. Page.44
40
J
Wiring example for photoelectric sensors
For a photoelectric sensor output configuration, connect as shown below:
Power supply
for sensor
V
CC
0V
+
24V
-
24V
0123
+
RS
485
+
-
+
-
F.G.
-
RS
485
4567
+
-
+
-
16-input type FP I/O transmitter unit
89AB
+
-
+
-
CDEF
+
-
+
-
Internal circuit Internal circuit Internal circuit
V
CC
0V
Relay output type
NPN open collector
output type
Universal output type
J
Notes on two-wire type sensor wiring
x The use of a bleeder resistor is recommended if the input is not turned OFF due to leakage current from a two-wire
type sensor.
x The OFFvoltageof the input is 2.4 V. Therefore, select an Rvalueso that the voltage between the negative(-)terminal
and the input terminal will be less than 2.4 V. The impedance of the input terminal is 4.4 k:.
x The bleeder resistor R is:
R
≦
10.56
4.4
I
–2.4
(k
Ω
)
I: sensor’s leakage current (mA)
x The wattage W of the bleeder resistor is:
W
=
(Power supply voltage)
2
R
Actually, use a value that is 3 to 5 times the value of W.
Bleeder
resistor
R
+
24V
-
24V
0123
+
RS
485
+
-
+
-
F.G.
-
RS
485
4567
+
-
+
-
8-input type FP I/O transmitter unit
Internal circuit
Two-wire type
sensor
3-2. Wiring