Mitsubishi Electric MELSEC FX3U - FNC 45 - MEAN; Mean

344
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
12 Data Operation – FNC 40 to FNC 49
12.6 FNC 45 – MEAN / Mean
12.6 FNC 45 – MEAN / Mean
Outline
This instruction obtains the mean value of data.
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 (MEAN and MEANP)
The mean value of "n" 16-bit data from is stored to .
• The sum is obtained as algebraic sum, and divided by "n".
• The remainder is ignored.
2. 32-bit operation (DMEAN and DMEANP)
The mean value of "n" 32-bit data from [ +1, ] is stored to [ +1, ].
• The sum is obtained as algebraic sum, and divided by "n".
• The remainder is ignored.
Operand type Description Data type
Head word device number storing data to be averaged 16- or 32-bit binary
Word device number storing the mean value result 16- or 32-bit binary
n
Number of data to be averaged (1 n 64)
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 3
3 3 3 3333
S 33 3
n 33 33
DMEAN
DMEANP
Mnemonic Operation Condition
P
FNC 45
MEAN
D
16-bit Instruction
7 steps
MEAN
MEANP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
13 steps
Continuous
Operation
Pulse (Single)
Operation
S 1 
S
D
S 1 
S
S 2 
D
D 1 S D 1 D
Command
input
FNC 45
MEAN
n
S  D 
n
S  S  S 
+ + 1 + ……… + + n − 1
D 
D 1 S D 1 S D 1 D D 1 D
[ + 1, ] + [ + 3, + 2] + ……… + [{ + n × 2 − 1}, { + n × 2 − 2}]
[ + 1, ]
Command
input
FNC 45
DMEAN
n
S  D 
n
S  S  S  S  S  S 
D  D 