Siemens SINUMERIK ONE NCU 1740 Equipment Manual page 130

Connectable components
12.3 PP 72/48D PN 2/2A PN
Name Designation
H2 PNSync
H3 PNFault
H4 DIAG1
H5 DIAG2
H6 OVTemp
Note
When the system is booting, LEDs H1, H2 and H3 are lit.
130
Color Description
Green Lit: Task system is synchronized to the bus cycle clock.
Not lit: Task system is not synchronized to the bus cycle clock.
Flashes 0.5 Hz: Task system has synchronized to the bus cycle clock and cyclic data ex‐
change is running.
Red Not lit: Module is operating without error.
Lit: A system error has occurred (faulty module, incorrect parameterization by the PROFI‐
NET controller, etc.).
Green Reserved
Green Reserved
Red Overtemperature display
Equipment Manual, 10/2021, A5E51087503B AA
NCU 1740