Omron NXR Series User Manual page 115

Precautions for Correct Use
If you set the following mode to pin 2 and pin 4 of the port for the IO-Link Master Unit and con-
nect the Unit with external devices, use the external devices without protective diodes in the lo-
cations shown in the following figure.
• Pin 2: SIO (DO) Mode, pin 4: IO-Link Mode
• Pin 2: SIO (DO) Mode, pin 4: SIO (DI) Mode
• Pin 2: SIO (DI) Mode, pin 4: SIO (DO) Mode
If the connected external devices have protective diodes, change them to those with built-in re-
verse current prevention diodes as shown in the following figure, or externally install reverse
current prevention diodes.
Unit/input power supply
Output power supply
L
Internal
circuits
Connected external device
L
Internal
circuits
Connected external device
If the connected external devices have protective diodes, reverse current flows due to a differ-
ence between the Unit/input power supply and the output power supply as shown in the figure
below, which may result in failure or malfunction of the product or connected external devices.
NXR-series IO-Link Master Unit for EtherCAT User's Manual (W640)
U/IN P+
U/IN P-
OUT P+
OUT P-
I/Q white
Protective diode
L+ brown
Built-in reverse current
prevention diode
C/Q black
I/Q white
Protective diode
L+ brown
External reverse
current prevention
C/Q black
diode
4
2
3
Power supply connector (input)
1
IO-Link Master Unit
2
I/O connector
3
Pin2: SIO (DO) Mode
1
Pin4: IO-Link Mode
4
or
SIO (DI) Mode
L- blue
2
I/O connector
3
Pin2: SIO (DI) Mode
1
Pin4: SIO (DO) Mode
4
L- blue
5 Installation and Wiring
5-23
5