Mitsubishi Electric M800VW Series Manual page 620

M800V/M80V Series PLC Development Manual
8 Appendix 2: List of PLC Alarms
Error contents and cause
NEXT instruction error
(1) NEXT instruction was executed before FOR instruction.
(2) After FOR instruction, END(FEND) was executed before NEXT
instruction.
BREAK instruction error
BREAK was executed outside the range between FOR and NEXT
instruction.
Structured ladder error
When sequence programs created using structured project are exe-
cuted
Data command range error
Description of specified device exceeds command range set on
each instruction
Real number calculation data error
When descriptions of specified device are the following values.
 Outside the range of the following
[single float] 2 to the power of -126 ≦ Specified device < 2 to the
power of 128
[double float] 2 to the power of -1022 ≦ Specified device < 2 to the
power of 1024
 -0, Denormalized number, Non-number, ± ∞
Real number calculation data error
When the real number calculation result exceeds the following
range.
[single float] Calculation result < 2 to the power of 128
[Double float] Calculation result < 2 to the power of 1024
PLC system error
Maximum project No. illegal (at PLC system startup)
Multi-project parameter setting is illegal (due to the following rea-
son).
 The value outside the setting range (1 to number of usable proj-
ect) was detected.
Project ratio illegal
Multi-project parameter setting is illegal (due to the following rea-
son).
 It was detected that the total of ratios of all projects was outside
the range from 0 to 100.
Temporary memory area over (at the PLC system startup)
Multi-project parameter setting is illegal (due to the following rea-
son).
 The ratio to which the area after the project ratio setting is small-
er than the size of ladder stored in the temporary memory area
was detected.
(1) Check and correct the NEXT instruction in the step to which the
error occurred.
(2) Check and correct the ladder circuit of the program to which the
error occurred. (Note that the number of steps at the error posi-
tion is displayed as "0".)
 Check if JMP,CALL,CJ instructions were executed between
FOR and NEXT instruction, and NEXT instruction was jumped.
 Check if FOR instruction and NEXT instruction are all paired.
Check and correct the BREAK instruction in the step to which the er-
ror occurred.
Check if the target sequence program is not created using structured
project
Check and correct the usage of instructions existing in the steps oc-
curred
Check and correct the usage of instructions existing in the steps oc-
curred
Check and correct the usage of instructions existing in the steps oc-
curred
Contact Mitsubishi Electric.
(1) Check the presence of the expansion project additional specifica-
tion and reconsider the setting range.
(2) The multi-project parameter (maximum project No.) setting is ille-
gal. Set the multi-project parameter again.
(3) If (1) or (2) does not solve the problem, there is a possibility that
the NC system is broken. Contact Mitsubishi Electric.
(1) The multi-project parameter (project ratio) setting is illegal. Set
the multi-project parameter again.
(2) If (1) does not solve the problem, there is a possibility that the NC
system is broken. Contact Mitsubishi Electric.
(1) Check the presence of additional specification "Large PLC ca-
pacity" and reconsider the storable size.
(2) The multi-project parameter (project ratio) setting is illegal. Set
the multi-project parameter again.
(3) If (1) or (2) does not solve the problem, there is a possibility that
the NC system is broken. Contact Mitsubishi Electric.
595
Remedy
IB-1501614-B