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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
12 Data Operation – FNC 40 to FNC 49
12.4 FNC 43 – SUM / Sum of Active Bits
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High-Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
12.4 FNC 43 – SUM / Sum of Active Bits
Outline
This instruction counts the number of "1" (ON) bits in the data of a specified device.
1. Instruction format
2. Set data
3. Applicable devices
S1: This function is supported only in FX3G/FX3GC/FX3U/FX3UC PLCs.
S2: This function is supported only in FX
3U/FX3UC PLCs.
Explanation of function and operation
1. 16-bit operation (SUM and SUMP)
The number of bits in the ON status in is counted, and stored to .
• When all bits are OFF in , the zero flag M8020 turns ON.
Operand type Description Data type
Word device number storing the source data 16- or 32-bit binary
Word device number storing the result data 16- or 32-bit binary
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD.b
KnX KnY KnM KnS
TCDRU\G V Z Modify K H E ""P
S1 S2
S1 S2
DSUM
DSUMP
Mnemonic Operation Condition
P
FNC 43
SUM
D
16-bit Instruction
5 steps
SUM
SUMP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
S
1
S
D
S
1
S
S
2
D
D
1
S
D
1
D
D
1
S
Number of bits in the
ON status in
→
S
D
Command
input
FNC 43
SUM
S
D
Before
execution
After
execution
S
D
S
D
K21847
K0
K21847
K9
Word data
16-bit data
0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1
0000000000000000
b0b1b2b3b4b5b6b7b8b9b10b11b12b13b14b15
0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1
b0b1b2b3b4b5b6b7b8b9b10b11b12b13b14b15
1001000000000000
123
←
4
←
5
←
6
←
7
←
8
←
9 (Number of "1" (ON))
32 16 8 4 2 1