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MELSEC-Q
7 FUNCTION
(4) Error check selection
The following error checking can be set to "yes/no" at the "PLC RAS" tab screen
in the “(PLC) Parameter" dialog box.
(All parameter defaults are set at "Yes".)
(a) Battery check
(b) Fuse blown check
(c) I/O unit comparison
Self-Diagnosis List
Diagnosis description Error message Diagnostic timing
CPU error MAIN CPU DOWN • Always
END instruction not executed END NOT EXECUTE • When the END instruction is executed
RAM check RAM ERROR • When the power is turned on/when reset
Calculation circuit check OPE.CIRCUIT ERR. • When the power is turned on/when reset
Fuse blown (default... stop)
1
FUSE BRAKE OFF
• When the END instruction is executed
(Default... Yes)
2
I/O interrupt error I/O INT ERROR • When an interrupt occurs
Intelligent function module error SP.UNIT DOWN
• When the power is turned on/when reset
• When the FROM/TO instruction is executed
Control bus error CONTROL-BUS ERROR.
• When the power is turned on/when reset
• When the END instruction is executed
• When the FROM/TO instruction is executed
Momentary stop occurred AC/DC DOWN • Always
Hardware failure
Battery low BATTERY ERROR • Always (Default...Yes)
3
I/O module verification (Default...
Stop)
1
UNIT VERIFY ERROR
• When the END instruction is executed
(Default... Yes)
2
Intelligent function module
allocation error
SP.UNIT LAY ERR.
• When the power is turned on/when reset
• When switched from STOP to RUN
Intelligent program execution error
(Default... Stop)
1
SP.UNIT ERROR • When the FROM/TO instruction is executed
Intelligent function module version
error
SP.UNIT VER.ERR. • When the power is turned on/when reset
No parameter MISSING PARA. • When the power is turned on/when reset
Boot error BOOT ERROR • When the power is turned on/when reset
Memory card operation error
(Default... Stop)
1
ICM.OPE.ERROR • When the memory card is installed/removed
File setting error FILE SET ERROR • When the power is turned on/when reset
File access error
(Default.. Stop)
1
FILE OPE.ERROR • When an instruction is executed
Handling error
Instruction execution not possible CAN´T EXE.PRG. • When the power is turned on/when reset
Parameter setting check PARAMETER ERROR
• When the power is turned on/when reset
• When switched from STOP to RUN
Link parameter error LINK PARA.ERROR
• When the power is turned on/when reset
• When switched from STOP to RUN
SFC parameter error SFC PARA.ERROR • When switched from STOP to RUN
Parameter error
Intelligent function module
parameter error
SP.PARA.ERROR • When the power is turned on/when reset
1:Can be changed to "Continue" in the GX Developer function parameter setting.
2:Can be set to "No" in the GX Developer function parameter setting. Also, checking is not performed when SM251 is on.
3:Can be set to "No" in the GX Developer function parameter setting.
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