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LED On/Off Operations
2
OPERATION AND CONTROL
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.
!
: On,
#
: Off, : Flicker
LED States
Cause
L.RUN SD RD L.ERR
!
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
CPU
Power supply
Master
module
Station No. 1
Inverter