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3. CC-Link Communication Function
3.7. LED Indication
The state of the module and that of the network can be displayed. See the description in the
following table for the LED indication.
LED
SD
RD
L RUN
L ERR
LRUN
LERR
0.4 s
◎
: Lit, : Unlit, : Blink
The blinking rate of SD is too quick that you may feel that the LED is continuously lit in the
communication state.
[SMF-2008]
Fig. 3.18. Name of LED
Table 3.12. LED specification list
Color
Lit during data transmission.
Lit during data reception.
Green
Lit when the slave station is receiving normal data from
the master station.
Unlit upon time-over.
Unlit during normal communication. (L RUN is lit.)
Lit upon a transmission error (CRC error).
Lit upon an error in the station number setting or
transmission speed setting.
Red
ERR blinks when the station number setting or
transmission speed setting is changed in the middle.
Unlit upon time-over.
Table 3.13. LED state list
SD
RD
CRC errors are sometimes caused in spite of normal
updates.
The baud rate or station number setting is changed from the
power-on setting.
Cannot respond due to a CRC error in the reception data.
◎
Normal communication
No data arrives at the own station.
Response to polling is made though the refreshment
reception is in a CRC error.
CRC error in data destined to own station
Link start is not made.
There is no data destined to the own station or reception is
disabled.
Data reception is disabled. In shutdown or H/W resetting.
/
Incorrect baud rate or station number setting
― 3- 17 ―
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L RUN
L ERR
RD
SD
Description of indication
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