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62
Cautions when using 2 wired type
Use a breeder resistor as below when the leakage current from 2 wired
type photoelectric switch or proximity switch keeps flowing into the
PLC.
DC 12-24V type input unit
(OFF voltage 2.5V, input impedance 3
K
Ω
)
2 wired sensor
DC input unit
Since the OFF voltage of input is 2.5V, determine the R
value to set the voltage between COM terminal and input
terminal to be 2.5V or less.
Input impedance is 3
K
Ω
For the resistor, W can be calculated as follows:
(Power supply voltage)
2
W
=
R
Use 3 to 5 times larger value
.
Breeder
resistor
Internal Circuit
Input
terminal
COM
terminal
7.5
R
≤
(
K
Ω
)
3I-2.5
3R
I x
≤
2.5,
3 + R
I: Leakage current (
mA
)
R: Breeder resistance (K
Ω
)
Summary of Contents for Samsung NX-CPU700p
Page 1: ...NX700 Series Controller NX CPU700p User Manual ...
Page 78: ...78 Power check flow chart ...
Page 79: ...79 Run check flow chart ...
Page 80: ...80 Error check flow chart ...
Page 82: ...82 External environment check flow chart ...
Page 86: ...86 ...
Page 98: ...98 ...
Page 102: ...102 Decimal Bin Hex BCD Gray Code Cross reference Table ...
Page 104: ...104 ...
Page 121: ......