Omron DeviceNet CV Series Operation Manual page 370

Precautions when Connecting Two-wire DC
When using a two-wire sensor with a 12-V DC or 24-V DC input device, check that the following conditions
have been met. Failure to meet these conditions may result in operating errors.
Relation between Slave with Transistor Inputs and Sensor Residual Voltage
≤ V
V – V
ON CC R
V : I/O power supply voltage (The allowable power supply range is 20.4 to 26.4 V, and thus
CC
20.4 V will be used to allow for the worst possible conditions.)
V : ON voltage for a Slave with Transistor Inputs
ON
V : Sensor's output residual voltage
R
ON Current for Slave with Transistor Inputs and Sensor Control Output (Load Current)
(min) ≤ I
I
OUT ON
I : Sensor control output (load current)
OUT
I : Slave ON current
ON
I = (V
ON
When I is smaller than I
ON
can be calculated as follows:
R ≤ (V
– V
CC
Power W ≥ (V
2-wire
sensor
Relation between OFF Current of Slave with Transistor Inputs and Sensor Leakage Current
≥ I
I
OFF leak
I : OFF current of Slave
OFF
I : Leakage current of Slave
leak
Connect a breeder resistor if I
breeder resistance constant.
R ≤ (I
x R
OFF
Power W ≥ (V
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Appendix D
Sensors
≤ I
(max.)
OUT
– V – V )/R
CC R F IN
V : Internal residual voltage of Slave
F
R : Input impedance of Slave
IN
(min), connect a bleeder resistor R. The bleeder resistor constant
OUT
)/(I (min.) – I )
R OUT ON
/R × 4 [allowable margin]
2
– V )
CC R
Slave with
Transistor
V R R
R
IN
Input
V
CC
is greater than I
leak
+ V )/(I – V )
IN F leak OFF
/R × 4 [allowable margin]
2
– V )
CC R
. Use the following equation to calculate the
OFF
353