A-2 Considerations for Connecting a Two-
wire DC Sensor
When you use a two-wire DC sensor with your IO-Link I/O Hub, check that the following conditions are
met. Failure to meet these conditions may result in operating errors.
Relation between ON Voltage of the IO-Link I/O Hubs and Sensor
Residual Voltage
The IO-Link I/O Hubs cannot detect sensor output ON without the following conditions met:
V
ON
≤ V
CC
- V
R
V
CC
: Power supply voltage applied to the device (Unit/input power supply voltage)
V
ON
: ON voltage applied to the input of the IO-Link I/O Hub
V
R
: Sensor’s output residual voltage
Relation between ON Current of the IO-Link I/O Hubs and Sensor
Control Output
The IO-Link I/O Hubs cannot detect sensor output ON without the following conditions met:
I
OUT
(min) ≤ I
ON
≤ I
OUT
(max)
I
OUT
: Sensor control output (load current)
I
ON
: Input current to the IO-Link I/O Hub
When I
ON
is smaller than I
OUT
(min), connect a bleeder resistor R.
The bleeder resistor constant can be calculated as follows:
Select an appropriate bleeder resistor R so that both equations can be satisfied.
R ≤ (V
CC
- V
R
) / (I
OUT
(min) - I
ON
)
Rated power W of bleeder resistor ≥ (V
CC
- V
R
)
2
/ R × 4 [allowable margin]
Example: When pin 4 is used for input
Appendices
A-3
NXR-series IO-Link I/O Hub User’s Manual (W620)
A-2 Considerations for Connect-
ing a T
wo-wire DC Sensor
A
Summary of Contents for NXR Series
Page 6: ...Manual Structure 4 NXR series IO Link I O Hub User s Manual W620 ...
Page 26: ...Revision History 24 NXR series IO Link I O Hub User s Manual W620 ...
Page 34: ...1 Features and System Configuration 1 8 NXR series IO Link I O Hub User s Manual W620 ...
Page 90: ...6 Process Data and Service Data 6 12 NXR series IO Link I O Hub User s Manual W620 ...
Page 108: ...7 Functions of IO Link I O Hubs 7 18 NXR series IO Link I O Hub User s Manual W620 ...
Page 131: ...I Index I 1 NXR series IO Link I O Hub User s Manual W620 I ...
Page 133: ......