Mitsubishi QJ71LP21 Reference Manual page 327

8 TROUBLESHOOTING
Error
Code Error Contents and Cause
*1
(SD0)
Since the manual system switching
enable flag (special register SM1592)
is OFF, manual system switching
4120
cannot be executed by the control
system switching instruction
(SP. CONTSW).
• In the separate mode, the control
system switching instruction
(SP. CONTSW) was executed in the
4121 standby system CPU module.
• In the debug mode, the control
system switching instruction (SP.
CONTSW) was executed.
Instructions to read SFC step
comment (S(P).SFCSCOMR) and
4130 SFC transition condition comment
(S(P).SFCTCOMR) are executed for
the comment file in ATA card
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*18 : This applies to the CPU module with the serial No. of first 5 disits "07032" or later.
8 - 116
Corrective Action
To execute control system switching
by the SP. CONTSW instruction, turn
ON the manual system switching
enable flag (special register SM1592).
• Reexamine the interlock signal for
the SP. CONTSW instruction, and
make sure that the SP. CONTSW
instruction is executed in the control
system only. (Since the SP.
CONTSW instruction cannot be
executed in the standby system, it is
recommended to provide an
interlock using the operation mode
signal or like.)
• As the SP. CONTSW instruction
cannot be executed in the debug
mode, reexamine the interlock
signal related to the operation mode.
Target comment file is to be other than
the comment file in ATA card.
MELSEC-Q
Corresponding
CPU
QnPRH
*18
Qn(H)
*18
QnPH
*18
QnPRH
8 - 116