Omron NXR Series User Manual page 100

7 Functions of IO-Link I/O Hubs
Overview and Applications
This function monitors the Unit/input power supply voltage fed to the Digital I/O Hub, and detects volt-
age drop when the voltage decreases below the monitored voltage.
Applicable Hubs
All models of the Digital I/O Hub
Function Details
This function detects voltage drop when the voltage is certainly below the lower limit for the Unit/input
power supply. You cannot configure the monitored voltage.
 How the Power Supply Voltage Drop Detection Works
If the function detects power supply voltage drop, the following bits of process input data turn ON
and the Unit/Input Power Supply Voltage Drop (5111 hex) device event occurs.
Refer to Process Input Data of each Hub in 6-1 Process Data on page 6-2 for details on the proc-
ess input data.
Event to detect
Unit/Input Power Supply Voltage Drop
*1. When this status is TRUE, the Input Data of the process data is invalid. Use the Input Data when the
status is FALSE.
The Unit/Input Power Supply Voltage Drop Detection Bit turns OFF when the cause of the power
supply voltage drop is removed.
On the other hand, the Unit/Input Power Supply Voltage Drop Detection Hold Bit remains ON after
the cause of the power supply voltage drop is removed. Refer to Turning OFF the Power Supply
Voltage Drop Detection Hold Bit on page 7-10 for how to turn off the bits.
Refer to 8-4 Checking for Errors and Troubleshooting with the Device Events on page 8-9 for de-
tails on the device events.
 Turning OFF the Power Supply Voltage Drop Detection Hold Bit
The Power Supply Voltage Drop Detection Hold Bit remains ON after the cause of the power sup-
ply voltage drop is removed. To turn OFF the bit, remove the cause of the power supply voltage
drop and perform either of the following operations a to c. The operations a and b configure the
relevant data in the service data through message communications from the Controller to the IO-
Link device. Refer to the NXR-series IO-Link Master Unit for EtherNet/IP User's Manual (Cat. No.
W619) for details on how to access the service data through message communications. Refer to
6-2 Service Data on page 6-9 for details on the service data.
a. Execute Power Supply Voltage Drop Detection Hold Reset
Write 01 hex: reset in the following service data.
This turns OFF the Power Supply Voltage Drop Detection Hold Bit.
7-10
Bit which turns ON
•
Unit/Input Power Supply Voltage Drop Detection Bit
•
Unit/Input Power Supply Voltage Drop Detection Hold Bit
NXR-series IO-Link I/O Hub User's Manual (W620)
*1