Mitsubishi MELSEC-A Series Operating Manual page 164

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7.
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3 MESSAGES
MELSEC-A
Table
7.1
List
of A8PUE
error messages
Error Message
ADDRESS ERROR
CAN'T BE SELECTED
CHECK M E M . CASSETTE
COIL ALREADY USED
DEVICE ERROR
INSTRUCTION ERROR
INSTRUCTION ERROR
MEMORY PROTECTED
MEM. CAP. EXCEEDED
NO "END' INSTRUCTION
NOT FOUND
OPERATION ERROR
PLC COMM.
ERR.
Display CondiIionr
0
When doing machine language writ-
ing, etc., an address was written to a
write-disabled area.
During start-up, because of a key
word mismatch, an attempt was
made to (a) select a mode that can-
not be selected, or (b) execute an op-
eration that cannot be done.
When clearing a key word or commu-
nicating with a CPU during parameter
write operations, the memory cas-
sette was either faulty or not installed.
The same coil was already in the se-
quence program.
The set device symbol was incorrect.
The device number exceeded the
range.
Could not be converted into a normal
instruction when a program was read.
A set instruction was incorrect during
When writing was attempted in the
READ, WRITE, or INSERT.
WRITE/INSERT/DELETE, etc.
modes, the memory protect switch in
the memory cassette was ON.
The memory allocation set in the pa-
rameter exceeded the capacity of the
memory cassette.
There was no END instruction.
The designation instruction was not
found.
An key error was made.
An attempt was made to write data to
the ROM or EEPROM of the CPU.
Could not communicate with a CPU
normally.
Corrective Action($)
Set a correct address.
Input the registered key word that
resets the A8PUE, and restart oper-
ations.
If the registered key word has been
forgotten, execute the CPU memory
all clear procedure, and restart op-
erations. (See Sections 5.1.3 and
6.9.7.)
Remember, that if this procedure is
executed, the entire CPU memory
will be cleared.
Replace the faulty memory cassette
Install a memory cassette correctly.
If it is no problem as far as control
is concerned, perform the next oper
ation.
control is concerned, modify the
program.
If there is a problem as far as
Set a correct device symbol.
Set the number within the CPU de-
vice range.
When the CPU detects an error,
switch the state from RUN to
STOP. And then, after resetting
the CPU, check the instructions be-
fore and after the step where the
error occurred, and write a correct
instruction. (Section
6.9.2
gives de-
tails about checking error steps.)
Set a correct instruction.
Set the memory protect switch in
the memory cassette to OFF.
Reset the parameter within the ca-
pacity of the memory cassette.
Write an END instruction as the last
step of the program.
Check the program.
Operate the key correctly.
Writing to the EEPROM when the
CPU is in the STOP state.
Do not attempt to write to the
ROM.
Retry the operation. If communica-
tions still cannot be done, check
the following:
The connection state of the A8PUE
The connection state of the cable
The CPU (whether or not an error
has occurred)
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