Mitsubishi MELSEC QCPU - BCD 8-Digit Addition and Subtraction Operations (DB+, DB+P, DB-, DB-P)

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MELSEC-Q/QnA
6 BASIC INSTRUCTIONS
High Performance
QnA Q4AR
Basic
QCPU
PLC CPU
Process CPU
6.2.6 BCD 8-digit addition and subtraction operations (DB+, DB+P, DB-, DB-P)
Usable Devices
Internal Devices
(System, User)
MELSECNET/10(H)
Direct J
\
Set
Data
Bit Word
File
Register
Bit Word
Special
Function
Module
U
\G
Index
Register
Zn
Constant
K, H
Other
S
D
[Instruction Symbol] [Execution Condition]
indicates the signs DB+ or DB-
Command
Command
P
S D
DB+
DB -
DB+P
DB - P
S D
[Set Data]
Set Data Meaning Data Type
S
Addition or subtraction data, or head number of device storing addition or
subtraction data
D
Data to be added to or subtracted from, or head number of device storing
such data
BCD 8-digit
[Functions]
DB
+
(1) Adds the BCD 8-digit data designated by
D
and the BCD 8-digit data designated by
S
, and
stores the result of the addition at the device designated by
D
.
+
0032345690871068
(Upper 4 digits)
(Lower 4 digits)
01 194524
+1+1 +1
Digits higher than those which were
designated will be read as 0.
D SD S D D
(Upper 4 digits)
(Lower 4 digits)
(Upper 4 digits)
(Lower 4 digits)
(2) The values for
S
and
D
can be between 0 to 99999999 (BCD 8-digit data).
(3) If the result of the addition operation exceeds 99999999, the upper bits will be ignored.
The carry flag in this case does not go ON.
+ 10 65432199 000000 00 654321
DB-
(1) Subtracts the BCD 8-digit data designated by
D
and the BCD 8-digit data designated by
S
,
and stores the result of the subtraction at the device designated by
D
.
0032345690871068
(Upper 4 digits)(Lower 4 digits)
9 547612
+1+1 +1
Digits higher than those which were
designated will be read as 0.
D SD S D D
0
(Upper 4 digits)(Lower 4 digits) (Upper 4 digits)(Lower 4 digits)
-
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