Only appropriately trained personnel may use the operating elements provided in the service
area.
NOTICE
Electrostatic discharge if there is no ground connection
If there is no ground connection or a faulty ground connection, then the electronic
components in the devices can be damaged as a result of electrostatic discharge (ESD).
• Before you open the service ap, discharge yourself at the cabinet or at the ground terminal.
① LED display
② 7-segment display
③ NCK commissioning switch (rotary switch)
④ Reset button
⑤ Diagnostics button
⑥ PLC mode selector switch (toggle switch)
Figure4-4 Position of operator control and display elements
Description
4.4Operator control and display elements
NCU 1750
36 Equipment Manual, 10/2023, A5E45627807B AH
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