Mitsubishi MELSEC LJ71C24, User Manual

Page: 299 / 428

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15 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error
Description
Signal
name
Corrective action
MC
Non-
proce-
dural
Bi-
direc-
tional
Pre-
defined
7FF0
H
Dedicated
instructions
simultaneous
execution error
•
Executed dedicated instructions
simultaneously.
⎯
•
Do not use dedicated instructions
simultaneously.
7FF1
H
Control data error
•
Setting value is incorrect.
•
Setting value is out of range.
⎯
•
Correct the setting value in the control
data.
7FF2
H
Communication
protocol setting
error
•
Instruction cannot be executed with the
current communication protocol.
⎯
•
Correct the setting value of the
communication protocol.
7FF3
H
to
7FF4
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
7FF5
H
Processing
cancelled due to
mode switching,
transmission
sequence
initialization, etc.
•
The processing in operation was
cancelled due to execution of the
following:
Mode switching, transmission sequence
initialization, receive data clear (by
buffer memory), user frame use
enable/disable designation, UINI
instruction, programmable controller
CPU information clear
⎯
•
Do not execute these functions during
any other processing.
7FF7
H
Simultaneous
access error
•
Multiple external devices accessed a
remote station on the same network at
the same time.
⎯
•
Multiple external devices must not
access a remote station on the same
network at the same time.
7FF8
H
7FFF
H
System error
•
The OS of the C24 detected some
error.
⎯
( 1)
B000
H
to
BFFF
H
Errors detected by
the CC-Link
module
⎯ ⎯
•
Take corrective action, referring to the
CC-Link Master/Local Module User's
Manual.
D000
H
to
DFFF
H
Errors detected by
the CC-Link IE
Field Network
module
⎯ ⎯
•
Take corrective actions, referring to the
user's manual of the CC-Link IE Field
Network.
1 Take corrective actions in the following procedure.
1) Check whether the C24, power supply module, and CPU module are installed
correctly.
2) Check whether the operating environment of the C24 is within the general
specifications range of the CPU module.
3) Check whether the power supply capacity is sufficient or not.
4) Check whether the hardware of the C24 and CPU module are normal
according to the manuals of the corresponding modules.
If any module is faulty, please consult your local Mitsubishi service center or
representative.
5) If the problem cannot be solved through the above steps, please consult your
local Mitsubishi service center or representative, explaining a detailed
description of the problem.