Mitsubishi Electric M800VW Series Manual page 618

M800V/M80V Series PLC Development Manual
8 Appendix 2: List of PLC Alarms
Error contents and cause
Global label boundary value error (Before executing PLC)
 "Global label" is as "labels of common pointer".
The content of PC parameter (common pointer boundary value) is
not normal.
(1) When using the multi-programming method, a value greater than
the maximum value is set.
(2) When using the independent program method, the label bound-
ary value of common pointer is set.
Reserved label error (Before executing PLC)
(1) When using the multi-programming method, disabled reserved
label exists.
(2) When using the independent program method, reserved labels
are duplicated.
Program setting error (Before executing PLC)
(1) When using the multi-programming method, PC parameter set-
ting is not correct.
 PC parameter (program setting) is not set.
 Unstored program name is set.
 The contents of the program name is abnormal.
 More than the maximum number of programs that can be set
(120 programs) are set
(2) When using the independent program method, multiple programs
are stored.
(3) When the multi-project is valid, the sum of all projects exceeds
the number of the programs which can be set (120 programs).
RET instruction error
(1) RET instruction was not executed at the branch destination of the
CALL instruction.
(2) RET instruction was executed without execution of CALL instruc-
tion.
Ladder code error (Before executing PLC)
An error was found in data for the sequence program to be executed.
(1) Disabled PLC instruction is used.
(2) Devices/labels are used for indexes in array labels.
(3) Sequence program stored in the built-in ROM is broken.
(4) Sequence program under development (before writing into the
built-in ROM) is broken.
No main processing ladders (Before executing PLC)
Main processing program to be executed cannot be>
(1) When using the multi-programming method, check the PC pa-
rameter program settings.
(2) When using the independent program method, add the reserva-
tion label (P4002) for the medium speed ladder.
Execution area over (Before executing PLC)
The total number of steps for the ladder to be executed has exceed-
ed the size of PLC processor execution area.
FOR instruction nesting over
17th level of nesting for FOR instruction was executed.
(1) When using the multi-programming method, correct the common
pointer boundary value to an appropriate value.
(2) When using the independent program method, delete the com-
mon pointer boundary value.
(1) When using the multi-programming method, delete the reserved
label.
(2) When using the independent program method:
 Delete the PC parameter program settings.
 Correct the duplication of reserved labels.
(1) When using the multi-programming method, check the PC pa-
rameter program settings.
 Check the program settings.
 Check the program name stored in the NC.
 Review the program name and rename it if necessary.
<Example>
The program name and the M device number in the PLC pro-
gram are overlapped.
 Set the number to 120 or less.
(2) When using the independent program method:
 Store only one program file.
(3) When the multi-project is valid, set the number of programs that
can be set to be less than 120 programs as the sum of all proj-
ects.
Check the following matters for the entire sequence program to be
executed.
(1) Check if RET instruction is programmed at the end of sub-routine
(2) Check if diverged to the other operation in the middle of sub-rou-
tine and RET instruction is not executed.
(3) Check if jumped to the END reservation label (P4005) in the mid-
dle of sub-routine.
(4) Check if there is delimiter (FEND instruction) between adjacent
program and sub-routine program.
(1) Check the sequence programs and delete disabled PLC com-
mands.
(2) When devices/labels are used for indexes in array labels, set
#4671 bit1 to 1.
(3)(4) Transferring, storing and ROM writing of the sequence pro-
gram must be re-executed with the GX Developer or PLC on-board
edit function.
(1) When using the multi-programming method, check the PC pa-
rameter program settings.
(2) When using the independent program method, add the reserva-
tion label (P4002) for the medium speed ladder.
Check the PC parameter (program setting) and set so that the total
number of steps for the ladder to be executed does not exceed the
PLC processor execution area.
Check the number of FOR instruction's nesting depth in the steps to
which the error occurred, and limit the number to 16 or less.
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Remedy
IB-1501614-B