Mitsubishi Electric MELSEC-Q/L - Page 262

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6 BASIC INSTRUCTIONS
6.2 Arithmetic Operation Instructions
• The following will happen if an overflow occurs in an operation result: The carry flag (SM700) in this case does not go ON.
■DBK-
• This instruction subtracts BIN 32-bit data stored in the n-point devices starting from the device specified by (S2) or a
constant from BIN 32-bit data stored in n-point devices starting from the device specified by (S1), and then stores the
operation result into the nth device specified by (D) and up.
When a device is specified for (S2)
When a constant is specified for (S2)
• Block subtraction is performed in 32-bit units.
• The constant in the device specified by (S2) can be between -2147483648 to 2147483647 (BIN 32-bit data).
• If the value specified by n is 0, the instruction will be not processed.
• Specify (D) out of the range of n-point devices starting from the device specified by (S1) and (S2). However, (S1) and (S2)
can specify the same device.
• The following will happen if an overflow occurs in an operation result: The carry flag (SM700) in this case does not go ON.
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.
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
4100 A negative value is specified for n. 
4101 The points specified in n exceed those of the corresponding device specified
in (S1), (S2), or (D).
The ranges of devices starting from the one specified in (S1) and (D) overlap
by n points. (except when the same device is specified in (S1) and (D)).
The ranges of devices starting from the one specified in (S2) and (D) overlap
by n points. (except when the same device is specified in (S2) and (D)).

K2147483647
(7FFFFFFF
H)
K 2147483647
(80000001
H)
+K
2
+K2
K 2147483647
K2147483647
(00000002
H
)
(
80000001
H
)
(
FFFFFFFE
H)
(
7FFFFFFF
H)
b31 b0
(BIN)
(BIN)
(BIN)
n
(BIN)
(BIN)
(BIN)
b31 b0 b31 b0
(BIN)
(BIN)
(BIN)
nn
(BIN)
30000
1234
(BIN)
44445
3333
-10000
12345
(BIN)
-55555
33333
44444
13579
54444
-1000000
S1 +1,
S1 +3,
S1 +5,
S1 +(2n-1),
S1
S1 +2
S1 +4
S1 +(2n-2)
S2 +1,
S2 +3,
S2 +5,
S2 +(2n-1),
S2
S2 +2
S2 +4
S2 +(2n-2)
D +1,
D +3,
D +5,
D +(2n-1),
D
D+2
D+4
D +(2n-2)
-
b31 b0
(BIN)
(BIN)
(BIN)
(BIN)
b31 b0 b31 b0
(BIN)
(BIN)
(BIN)
nn
(BIN)
-109998
90000
70000
9999
(BIN)
-99999
99999
-59999
79999
69998
S1 +1,
S1 +3,
S1 +5,
S1 +(2n-1),
S1
S2 +1, S2
S1 +2
S1 +4
S1 +(2n-2)
D +1,
D +3,
D +5,
D +(2n-1),
D
D+2
D+4
D +(2n-2)
-
K2147483647
(7FFFFFFF
H)
K 2147483647
(80000001
H)
K
2
K 2
K 2147483647
K2147483647
(00000002
H
)
(
80000001
H
)
(
FFFFFFFE
H )
(
7FFFFFFF
H
)