Mitsubishi Electric MELSEC-Q/L - Page 680

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7 APPLICATION INSTRUCTIONS
7.14 File Register Switching Instructions
Operation error
• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.
Program example
• The following program compares R0 of block No. 0 and R0 of block No. 1.
Error
code
Error details Q00/
Q01
QnH QnPH QnPRH QnU LCPU
4100 The block number specified in (S) does not exist. 
4101 There is no file register for the specified block No. 
[Ladder Mode]
[List Mode]
[Operation]
Designates block No. 0
Executes reading R0 of block No.0
Designates block No. 1
Executes reading R0 of block No.1
Compares the read values
Step Instruction Device
Y41 turns ON since D0<D1
756
Block No. 0
R3
R1
R2
R0
R4
R5
-7981
5001
128
-3216
9610
0
Block No. 1
R3
R1
R2
R0
R4
R5
3911
9330
-1762
756
-5
-3781
D0 D1
-3216