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I
ON
= (V
CC
− V
R
- 1.5 [internal residual voltage of DC input]) / R
IN
When I
ON
is smaller than I
OUT
(min), connect a bleeder resistor R. The bleeder resistor constant
can be calculated as follows:
R ≤ (V
CC
− V
R
) / (I
OUT
(min) − I
ON
)
Power W of bleeder resistor ≥ (V
CC
− V
R
)
2
/ R × 4 [allowable margin]
V
CC
: Input voltage of DC input
V
R
: Sensor's output residual voltage
I
ON
: Input current of DC input
I
OUT
: Sensor control current (load current)
R
IN
: Input resistor of DC input
(c) Relation between OFF current of the DC input and sensor leakage current
I
OFF
≥ I
leak
When I
leak
is greater than I
OFF
, connect a bleeder resistor R.
Use the following equation to calculate the bleeder resistance constant.
R ≤ R
IN
× V
OFF
/ (I
leak
× R
IN
− V
OFF
)
Power W of bleeder resistor ≥ (V
CC
− V
R
)
2
/ R × 4 [allowable margin]
Two-wire sensor
General digital input
and flag input
V
R
V
CC
R
V
CC
: Power supply voltage
V
R
: Sensor's output residual voltage
V
ON
: ON voltage of DC input
I
OUT
: Sensor control output (load current)
V
OFF
: OFF voltage of DC input
I
leak
: Sensor leakage current
I
ON
: ON current of DC input
R: Bleeder resistor
I
OFF
: OFF current of DC input
R
IN
: Input resistor of DC input
(d) Precautions on sensor inrush current
An incorrect input may occur due to sensor inrush current if a sensor is turned ON after the DC
input section has started up to the point where inputs are possible.
5 Installation and Wiring
5-66
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
Содержание NX1P2 series
Страница 8: ...Manual Structure 6 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 52: ...Revision History 50 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 82: ...2 System Configuration 2 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 170: ...a b Flat blade screwdriver 1 2 5 Installation and Wiring 5 26 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 174: ...4 Close the Memory Card cover 5 Installation and Wiring 5 30 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 176: ...4 Close the Memory Card cover 5 Installation and Wiring 5 32 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 224: ...0 4 mm Side view Front view 2 5 mm 5 Installation and Wiring 5 80 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 258: ...Appendices A 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 259: ...I Index I 1 NX series NX1P2 CPU Unit Hardware User s Manual W578 I...
Страница 262: ...Index I 4 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 263: ......