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MELSEC-Q
11 TROUBLESHOOTING
Symptom Cause Corrective action
MC
Bidirectional
Non
procedure
Pre-defined
• An error was generated on the
CC-Link IE Controller Network,
CC-Link IE Field Network,
MELSECNET/H,
MELSECNET/10.
• The local station CPU on the
CC-Link IE Controller Network,
CC-Link IE Field Network,
MELSECNET/H,
MELSECNET/10 generated an
error.
• Check the error contents from the state
of SB and SW related to the CC-Link IE
Controller Network, CC-Link IE Field
Network, MELSECNET/H,
MELSECNET/10 with the GX Developer
monitor, etc. and perform the checks
and take the corrective action described
in the CC-Link IE Controller Network,
CC-Link IE Field Network,
MELSECNET/H, MELSECNET/10
reference manual.
• Module installation address
designation during
communications with intelligent
function module is incorrect.
• Change the transmit message
designation data.
• Stop the CPU 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 "Disable write
during RUN" is set.
• Set the "Enable/disable write during
RUN" switch to "Enable" by command.
11.3.9 Communication error "P/S"
Symptom Cause Corrective action
MC
Bidirectional
Non
procedure
Pre-defined
• Data does not match the
parity bit setting.
• Check the Q series 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 Q series 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.
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