Input, Output modules is if data comes in or out
you can't change this LEDs.
you find it in "Technical documentations"
To simplify system diagnostics the I/O device will use its LEDs, if available, to indicate
different status conditions.
Red LED
The red LED indicates outgoing message traffic from the I/O device. The LED toggles its
state with every successfully transmitted frame.
If the device’s CAN-bus goes into a bus off condition then the LED will be permanently
on.
Green LED
The green LED indicates that the I/O device is seeing incoming message traffic. The LED
toggles its state with every successfully received frame. If no messages are received for
more than 10 seconds, then the LED starts to blink at a one Hertz rate.
Time critical messages and messages which have to be used all the time are
implemented with a sub identifier which has a value from 0 to 0xFE.