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No.JXC#-OMX0009-A
17. Alarm Detection for CC-Link Communication
The contents of the alarms related to CC-Link communication can be checked by referring to the LED
indicator on the controller or the corresponding memory in the CC-Link.
When an alarm is generated, refer to the following to take countermeasures or make corrections, and
then reset the alarm.
Alarms are divided into two types. One can be cleared by inputting the RESET signal. The other cannot
be cleared unless the control power supply (C 24V) is turned off.
17.1 Alarm details
● The following tables show alarm details that can be confirmed by Controller LED display.
Controller
state
LED name and display
Alarm clear
method
Contents , Countermeasure
PWR
ALM
LRUN
LERR
CPU
ROM
・
RAM
check
error
-
-
Green
On
Red
On
Power off
<Contents>
Checksum error of built-in flash or RAM check error
was occurred with communication CPU.
<Countermeasure>
If the alarm cannot be deactivated even after the
power is reapplied, please contact SMC.
CC-Link
Commun
ication
stop
-
-
Off
Off
Turn ON
the reset
flag, and
then input
RESET or
turn OFF
the
control
power
supply.
<Contents>
Communication time-out and communication
abnormality occurred in CC-Link.
<Countermeasure>
Check the connection with the upper-level device, and
then reset the alarm according to the state of the L
RUN LED on the PLC and the JXCM1 flag status.
PLC
LED
(LRUN)
JXCM1
The abnormal
station detection
flag RWr0,bit F
Alarm clear
method
ON
ON
Turn on RWw0,
bit 2: Reset flag,
and then turn on
Ry0B: RESET.
OFF
-
Power off
controlled source
and PLC
CC-Link
CRC
error
-
-
Off
Red
On
Turn ON
the reset
flag, and
then input
RESET or
turn OFF
the
control
power
supply.
<Contents>
The CRC error occurred in CC-Link.
<Countermeasure>
・
When CC-Link communication is available
Turn ON RWw0,bit3: Restart flag. In addition, when
the undefined parameter 11 (Operation-setting
parameter at CC-Link communication error) is 10,
turn ON the RWw0,bit2: Reset flag, and then turn
ON Ry0B: RESET.
・
When CC-Link communication is unavailable
Turn OFF the control power supply.
STATION
No. error
-
-
Green
flashing
Red
On
Power off
<Contents>
This error is generated when a station number that is
outside the station-number setting range (1 to 63) is
set by the rotary switch (STATION No.).
<Countermeasure>
Check whether the rotary switch (STATION
No.) is set correctly.