Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 734

Error Error name
code
24C3H System bus
error
24C4H System bus
error
24C5H
24C6H System bus
error
24C8H System bus
error
APPX
732
Appendix 1 Error Codes
Error details and cause
• An error was detected on the
system bus.
• An error was detected on the
system bus.
• An error was detected on the
system bus.
• An error was detected on the
system bus.
Stop/ Action
continue
Stop ■CPU module
• Take measures to reduce noise.
• Reset the CPU module and run it
again. If the same error code is
displayed again, the possible cause is
a hardware failure of the CPU module,
base unit, extension cable, or module
(I/O module or intelligent function
module) connected. Please consult
your local Mitsubishi representative.
■Redundant function module
• The possible cause is malfunction due
to noise. Take measures to reduce
noise by checking the distance of wires
and cables, and the grounding status of
each device.
• Execute a module communication test.
If the same error code is displayed
again, the possible cause is a
hardware failure of the redundant
function module. Please consult your
local Mitsubishi representative.
Stop • Take measures to reduce noise.
• Reset the CPU module and run it
again. If the same error code is
displayed again, the possible cause is
a hardware failure of the base unit,
extension cable, or module (I/O module
or intelligent function module)
connected. Please consult your local
Mitsubishi representative.
■CPU module
Stop
• Take measures to reduce noise.
• Reset the CPU module and run it
again. If the same error code is
displayed again, the possible cause is
a hardware failure of the CPU module
or extension cable. Please consult your
local Mitsubishi representative.
■Redundant function module
• The possible cause is malfunction due
to noise. Take measures to reduce
noise by checking the distance of wires
and cables, and the grounding status of
each device.
• Execute a module communication test.
If the same error code is displayed
again, the possible cause is a
hardware failure of the redundant
function module. Please consult your
local Mitsubishi representative.
Stop • Take measures to reduce noise.
• Reset the CPU module and run it
again. If the same error code is
displayed again, the possible cause is
a hardware failure of the extension
cable, or module (I/O module or
intelligent function module) connected.
Please consult your local Mitsubishi
representative.
Detailed Diagnostic
information timing
System At module
configuration access
information
System At module
configuration access
information


At module
access

At power-on,
at RESET