Mitsubishi MELSEC Q Series Programming Manual page 711

Operation Error
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and
an error code is stored into SD0.
• The block number designated by
• There is no file register for the specified block No.
Program Example
(1) The following program compares R0 of block No. 0 and block No. 1.
[Ladder Mode]
[List Mode]
Step Instruction
[Operation]
Block No. 0
R0 -3216
R1 5001
R2 128
R3 -7981
R4 9610
R5 0
does not exist.
S
Designates block No. 0
Executes reading R0 of block No.0
Designates block No. 1
Executes reading R0 of block No.1
Device
D0 D1
-3216
Y41 turns ON since D0<D1
Compares the read values
Block No. 1
756
9330
-1762
756 3911
-5
-3781
RSET(P)
(Error code: 4100)
(Error code: 4101)
R0
R1
R2
R3
R4
R5
7-337
1
2
3
4
6
6
7
8