Which LED indication shows that the IO-Link master port is connected to a photoelectric sensor?

The indication that shows the IO-Link master port is connected to a photoelectric sensor is represented by a flashing green LED. This type of signal typically indicates active communication between the IO-Link master and the connected device, such as a photoelectric sensor.

When the LED is flashing green, it generally means that data is being transmitted successfully. This constant data exchange is crucial for the operation of sensors that monitor physical parameters and relay that information back to control systems in real-time, which is essential in an Industry 4.0 context where responsiveness and accuracy are key.

A solid green LED would generally indicate that the device is powered and ready but may not necessarily communicate data. Flashing red would indicate an error or malfunction, while solid yellow could signal a warning or an intermediate state, neither of which would confirm a successful connection specifically to a photoelectric sensor. Hence, the flashing green LED is the correct indication in this scenario.