Mitsubishi Electric M800 Series Manual page 130

M800/M80/E80/C80 Series Alarm/Parameter Manual
10 User PLC Alarms (U)
U10 Illegal PLC
Details
No main processing ladders (Before executing PLC)
Main processing program to be executed cannot be identified.
(1) When using the multi-programming method, main processing "scan" is not set in the PC parameter (pro-
gram setting).
(2) When using the independent program method, no reservation ladder for the main processing ladder is avail-
able.
Remedy
(1) When using the multi-programming method, check the PC parameter program settings.
(2) When using the independent program method, add the reservation label (P4002) for the medium speed lad-
der.
U10 Illegal PLC
Details
Execution area over (Before executing PLC)
The total number of steps for the ladder to be executed has exceeded the size of PLC processor execution
area.
Remedy
Check the PC parameter (program setting) and set so that the total number of steps for the ladder to be exe-
cuted does not exceed the PLC processor execution area.
U10 Illegal PLC
Details
FOR instruction nesting over
17th level of nesting for FOR instruction was executed.
Remedy
Check the number of FOR instruction's nestings in the steps generated, and keep the number to 16 or less.
U10 Illegal PLC
Details
NEXT instruction error
(1) NEXT instruction was executed before FOR instruction.
(2) After FOR instruction, END(FEND) was executed before NEXT instruction.
Remedy
(1) Check the NEXT instruction existing in the number of steps generated and correct.
(2) Check the ladder circuit of the program No. generated and correct. (Note that the number of steps at the
error position is displayed as "0".)
- Check if JMP,CALL,CJ instructions were executed between FOR and NEXT instruction, and NEXT in-
struction was jumped.
- Check if FOR instruction and NEXT instruction are all paired.
U10 Illegal PLC
Details
BREAK instruction error
BREAK was executed outside the range between FOR and NEXT instruction.
Remedy
Check the BREAK instruction existing in the step generated and correct.
U10 Illegal PLC
Details
PLC system error
Remedy
Contact Mitsubishi.
0x280*
0x29xx.yy
0x30xx.yy
0x31xx.yy
0x32xx.yy
0x400*
113
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Number of steps
Number of steps
Number of steps
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IB-1501279-H