① LED display
② 7-segment display
③ PLC mode selector switch (toggle switch)
④ Reset button
⑤ Diagnostics button
⑥ NCK commissioning switch (rotary switch)
Figure 4-5 Position of operator control and display elements
4.4.2 LED displays
Meaning of the RUN/STOP, ERROR and MAINT PLC-LEDs
RUN/STOP LED ERROR LED MAINT LED Meaning
LED o LED o LED o
Supply voltage at the CPU not present or too low.
LED o
LED ashes red
LED o
An error has occurred.
LED lights up green LED o LED o
The CPU is in the RUN operating state.
Description
4.4 Operator control and display elements
NCU 1740
34 Equipment Manual, 10/2021, A5E51087503B AA
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