2N Lift8 v1.6.0 - Manual (Page 106)

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®
LED Indicators
The I/O Module is equipped with ten LED indicators: two I/O Module status signalling
LEDs, four input status signalling LEDs and four output status signalling LEDs. Refer to
the table for details.
Name Colour Description
OK Green
If everything is OK, the power supply and bus are connected, the
I/O Module is communicating with the CU, the LED is flashing.
ERR Red
If the red LED is on, the bus is not connected or there is an address
collision with another I/O Module in the system.
Logic
input
1–4
Orange
This LED is on when the given input is active, i.e. nominal voltage
for detection of logic 1 is detected on it.
Logic
output
1–4
Orange
This LED is on when the given input is active, i.e. the given relay is
closed.
Logic Input Connection
Up to 4 galvanically isolated logic inputs can be connected to each I/O Module. The
nominal voltage of these inputs is 12–24 V. The minimum detectable level is 8 V and
the maximum level may not exceed 30 V. Otherwise, the I/O Module input circuits will
get damaged. Transition to state 1 occurs with the logic signal rising edge and
transition to state 0 with the falling edge. Every transition is detected and displayed in
the
application. At the same time, every status change is recorded 2N Service Tool
®
in the system log for later use and the user is informed via a pop-up window. See the
figure below for an example of input circuit connection.
Figure: Example of Input Circuit Connection