Mitsubishi MELSEC LJ71C24, User Manual

Page: 312 / 428

15 - 43 15 - 43
15 TROUBLESHOOTING
Symptom Cause Corrective action MC
Bi
di
re
ct
io
na
l
N
on-
procedural Predefined
• An error was generated on
the CC-Link IE Controller
Network.
• The local station CPU
module on the CC-Link IE
Controller Network
generated an error.
• Check the error contents from the state of
SB and SW related to the CC-Link IE
Controller Network with the GX Works2
monitor, etc. and perform the checks and
take the corrective action described in the
CC-Link IE Controller Network reference
manual.
• Module installation address
designation during
communications with
intelligent function module
is incorrect.
• Change the transmit message designation
data.
• Stop the CPU module and restart data
communications.
• Communication
error signal "C/N"
turned on.
• A command that cannot be
transmitted during RUN
(sequence program,
parameters, etc.) was
transmitted, or "Online
Change" is disabled by
setting.
• Enable the "Online Change" by command
and restart data communications.
15.3.9 Communication error "P/S"
Symptom Cause Corrective action
MC
Bidirectional
N
on-
procedural
Predefined
• Data does not match the
parity bit setting.
• Check the C24 and external device data format
and match the settings.
• Sum check codes do
not match.
• Check if the sum check code transmitted from
the external device is correct. (Recalculate)
• Communication
error signal "P/S"
turned on.
• When CH1 and CH2 are
used in the linked mode,
the cable is not
connected to one of the
interface.
• When using CH1 and CH2 independently, check
that the C24 is not in the linked mode.
• When using CH1 and CH2 in the linked mode,
also connect the cable to both of the interfaces.
Note
• If the cable is not connected to one of the
interfaces when CH1 and CH2 are used in
the linked mode, noise may enter and the
data may be destroyed and "Data cannot be
decoded" or "Communications error cause"
may occur.