I/O Cable Short-Circuit Detection; Overview Of Function; Details On Function - Omron NXR Series User Manual

9 Functions
9-9

I/O Cable Short-circuit Detection

This section describes I/O cable short-circuit detection.
9-9-1

Overview of Function

A function that protects the output circuit for each port on the IO-Link Master Unit when a short-circuit
occurs in the power supply for a connected external device or load.
The IO-Link Master Unit cuts off the relevant output circuit if it detects a short-circuit and reports the
occurrence of the event.
This function is enabled regardless of the type of the connected external device, so no settings are
required by the user.
9-9-2

Details on Function

If a current that exceeds the maximum load current flows due to a short-circuit between pin 3 and pin
1, between pin 3 and pin 2, or between pin 3 and pin 4 of the port, the function cuts off the output
circuit to protect the IO-Link Master Unit.
When the port is short-circuited, the I/O cable short-circuit detection function releases the protection
after a certain time. If the short-circuit is not removed, the function sets the protection again. This oper-
ation is repeated as long as the port remains in a short-circuit state.
If the short-circuit is removed, the protection remains to be released.
When a short-circuit is detected, the occurrence of the event is reported with the following methods.
Location where short-circuit is detected
Between pin 1 and pin 3
Between pin 2 and pin 3
Between pin 4 and pin 3
From the user program, etc., access Port
Port £ Pin4 Short-circuit Error in the I/O Port Error Status of I/O data.
Refer to 11-3 Checking for Errors with the Status in I/O Data on page 11-14 for information on the
above data.
The following tables show how the function works with Pin4 Communications Mode Setting and Pin2
Communications Mode Setting.
Pin 4
Set value of Pin4 Communica-
tions Mode Setting
IO-Link Mode
SIO (DI) Mode
SIO (DO) Mode
Disable Port
Pin 2
9-22
Port£ Pin1 Short-circuit Error changes to TRUE.
Port£ Pin2 Short-circuit Error changes to TRUE.
Port£ Pin4 Short-circuit Error changes to TRUE.
£ Pin1 Short-circuit Error, Port £ Pin2 Short-circuit Error, and
Between pin 1 and pin 3
Detection and protection enabled
NXR-series IO-Link Master Unit for EtherCAT User's Manual (W640)
Notification method
Between pin 4 and pin 3
Detection and protection enabled
Detection and protection disabled
Detection and protection enabled
Detection and protection disabled