Filter
Top Products
322
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
12 Data Operation – FNC 40 to FNC 49
12.4 FNC 43 – SUM / Sum of Active Bits
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
S: This function is supported only in FX3U/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 T C D R U\G VZModifyKH E ""P
33333333 S 33 3 33
3333333 S 33 3
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