3.1.3.2 Behavior of the LEDs during booting
Table 3-12 Load software
LED Status Comment
RDY COM OPT
Red Orange Orange Reset Hardware reset
RDY LED lights up red, all other LEDs light
up orange
Red Red Off BIOS loaded –
Red flash‐
ing light 2
Hz
Red Off BIOS error
● Error occurred while loading the BIOS
Red flash‐
ing light 2
Hz
Red flash‐
ing light 2
Hz
Off File error
● Memory card not inserted or defective
● Software on memory card not present
or corrupted
Red Orange
flashing
light
Off FW loading RDY LED lights up red, COM LED flashes
orange without fixed frequency
Red Off Off FW loaded –
Off Red Off FW checked
(no CRC error)
–
Red flash‐
ing light 0.5
Hz
Red flash‐
ing light 0.5
Hz
Off FW checked
(CRC error)
● CRC invalid
Table 3-13 Firmware
LED Status Comment
RDY COM OPT
Orange Off Off Initializing –
Alternating Running See the table below
Control Units
3.1 Control Unit CU320-2 PN (PROFINET)
Supplementary component descriptions
24 Manual, 06/2019
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