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6. RCS-C and E-Con
5.4 Troubleshooting
When a problem occurs in the CC-Link, check the operating condition with the table below to remove the cause.
When the ERR LED lights or flashes, or when the green LED turns off abnormally during communications, check
(or reset) connections of the power and communications cables, setting of rotary switches, and setting of
parameters before turning on the power to the controller main unit again.
䕿: ON, 䖃: OFF, 䖂: Flashing
RUN
(Green)
ERR
(Red)
SD
(Green)
RD
(Green)
Operating condition
䕿䖂䖂䕿
There is normal communications, but a CRC* error sometimes
occurs with noise.
䕿 0.5s䖂䖂 䕿
There are normal communications, but the baud rate or station
setting switch malfunctions.
䕿䖂䖂䖃
(Impossible condition)
䕿䖂䖃䕿
With the received data having a CRC* error, there can be no
response.
䕿䖂䖃䖃 (Impossible condition)
䕿䖃䖂䕿 Normal communications
䕿䖃䖂䖃 (Impossible condition)
䕿䖃䖃䕿
Local station address receiving data has not arrived.
䕿䖃䖃䖃 (Impossible condition)
䖃䖂䖂䕿
There is the polling response, but refresh receiving has a CRC*
error.
䖃䖂䖂䖃 (Impossible condition)
䖃䖂䖃䕿
Local station address receiving data has a CRC* error.
䖃䖂䖃䖃
(Impossible condition)
䖃䖃䖂䕿 There is no link start-up.
䖃䖃䖂䖃
(Impossible condition)
䖃䖃䖃䕿
There is no local station address receiving data or it is impossible to
receive such data with noise. (Data volume is insufficient transmitted
from the master station.)
䖃䖃䖃䖃
It is impossible to receive data as a result of disconnection, etc.
䖃䕿䖃䕿, 䖃 The baud rate or station number is invalid.
䖃䖃䖃䖃
There is a power interruption or there is a breakdown with the
remote station power supply part.
*CRC: Cyclic Redundancy Check
Data error detection method frequently used in the case of synchronous transmission is adopted.
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