Operation
7.2 Operation States Displayed via LED
Control Units CU240S
192 Operating Instructions, 07/2008 - FW 3.2, A5E00766042B AD
CU states displayed via LED
Note
This symbol indicates that the LED state (on, off or flashing) is not relevant for the
corresponding CU state
States on standard CUs Prio SF RDY
Commissioning 1 /
Firmware update from MMC / parameter download 1 /
General faults 1
Ready 3
States on PROFIBUS DP CUs Prio SF RDY BF
Commissioning 1 /
Firmware update from MMC / parameter download 1 /
General faults 3
Bus failure (no data) 3 / /
Bus failure (search baud rate) 3 / /
Ready 4
Note
Control Unit with PROFIBUS-DP interface - operation using terminals
If a Control Unit with a PROFIBUS-DP interface is operated using the terminals, the fieldbus
LED will indicate a failure. To avoid this situation, the fieldbus off-time in Parameter P2040
should be set to "0".
States on Profinet CUs Prio SF RDY BF LNK ACT
Commissioning 1 /
/ /
Firmware update from MMC /
parameter download
1 /
/ /
General faults 3
/ /
Bus failure (no data) 3 / /
Bus failure (search baud rate) 3 / /
PROFIsafe failure 3
/ /
Link established 3 / /
/
No link established 3 / /
Data receive / transfer 3 / /
Ready 4
/ /
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