Operation
7.2 Operation States Displayed via LED
Control Units CU240S
Operating Instructions, 07/2008 - FW 3.2, A5E00766042B AD
191
Behavior of the status LED
CU240S CU240S
DP
CU240S
DP-F
CU240S
PN
CU240S
PN-F
System-Fault (SF)
• ON: A general system error either software or hardware
related is indicated.
• Flashing: Download from MMC runs
x x x x x
Ready (RDY)
• ON: The inverter is ready to run or running.
• Flashing: Commissioning or download from MMC runs
x x x x x
Bus-Failure (BF)
• ON: Bus failure, no connection to the DP-Master /
PROFInet I/O controller (searching for baud rate)
A bus failure is defined as signaling problem on the bus
itself.
Faults according to the inner data structure of the
transmitted communication frames (e.g. CRC check of
PROFIsafe telegram) are not denoted as bus failure. Such
failures are indicated by the SF LED.
• Flashing: I/O device is not configured or is wrongly
configured (baud rate found, no data exchange).
x x x x
Link-established (LNK)
• ON: Link established
• OFF: No link established
x x
RX/TX (ACT)
• ON: Data transfer
• OFF: No data tansfer
x x
End-state (ES)
• ON: The end state of a triggered fail-safe function (flashing
LED) has been reached.
• Flashing: Safety commissioning or download
from MMC runs
x x
Safe Torque Off (STO)
Safe Stop 1 (SS1)
Safely-Limited Speed (SLS)
• ON: Function parameterized
• Flashing: Activated
• All Safety LEDs flashing: Safety commissioning or
download from MMC runs
• Flashing and LED ES ON: End state reached
x x
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