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2.6.1
How to check the LED lamps for CC-Link
communication errors
(1)
When one inverter is connected
The following table indicates the fault causes that can be determined from the inverter
LED states under the condition that the SW, M/S and PRM LEDs of the master module
are off (the master module has been set properly) in the system configuration where
one inverter is connected.
LED States
L.RUN SD
RD L.ERR
!
!
!
#
!
#
!
#
!
#
!
#
#
!
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
!
#
#
#
CPU
Master
module
Normal communication is made but CRC error occurred due to
noise.
#
Normal communication
Hardware fault
#
Hardware fault
Receive data is in CRC error and response cannot be made.
#
Data addressed to the host does not arrive.
Hardware fault
#
Hardware fault
Polling response is made but refresh receive is in CRC error.
#
Hardware fault
Hardware fault
#
Hardware fault
Data addressed to the host is in CRC error.
Data addressed to the host does not exist or cannot be received
#
due to noise.
Hardware fault
#
Data cannot be received due to cable breakage, etc.
!
Baudrate or station number setting illegal.
Baudrate or station number changed midway.
#
WDT error (hardware fault), power off, power supply section fault
Station No. 1
Inverter
Cause
!
45
LED On/Off Operations
#
: On,
: Off,
: Flicker
2
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