Omron CK3M Seres Hardware User Manual page 208

5 Wiring
Failure to meet these conditions may result in operating errors.
 Relation between ON voltage of the general digital input / flag input and
sensor residual voltage
V ≤ V - V
ON CC
V : ON voltage of general digital input and flag input
ON
V : Input voltage of general digital input and flag input
CC
V : Output residual voltage of sensor
R
 Relation between input current to the general digital input / flag input and
sensor control output (load current)
I (min) ≤ I
OUT
Precautions for Correct Use
The general digital input and flag input are constant current type input.
For constant current type input, the input current does not increase linearly with the input volt-
age.
If you gradually raise the input voltage, once the input current reaches I
does not increase and remains roughly constant even when the input voltage is raised.
When I is smaller than I
ON
can be calculated as follows:
R ≤ (V - V
CC
Power W of bleeder resistor ≥ (V
V : Input voltage of general digital input and flag input
CC
V : Output residual voltage of sensor
R
I : Input current of general digital input and flag input
ON
I : Sensor control output (load current)
OUT
 Relation between OFF current of the general digital input / flag input and
sensor leakage current
The general digital input and flag input cannot detect sensor output OFF unless the following condi-
tions are satisfied:
I ≥ I
OFF leak
When I is greater than I
leak
Use the following equation to calculate the bleeder resistance constant.
R ≤ (V / I
OFF
Power W of bleeder resistor ≥ (V
5-30
R
≤ I (max)
ON OUT
(min), connect a bleeder resistor R. The bleeder resistor constant
OUT
) / (I (min) - I )
R OUT ON
− V
CC
, connect a bleeder resistor R.
OFF
) × V / (I × (V
OFF OFF leak OFF
− V
CC
CK3M/CK5M Series Programmable Multi-Axis Controller Hardware User's Manual (O036)
2
) / R × 4 [allowable margin]
R
/ I ) - V )
OFF OFF
2
) / R × 4 [allowable margin]
R
, the input current
ON