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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
24 Others – FNC181 to FNC189
24.2 FNC184 – RND / Random Number Generation
24.2 FNC184 – RND / Random Number Generation
Outline
This instruction generates random numbers.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (RND and RNDP)
This instruction generates a pseudo-random number within the range from 0 to 32767, and stores it as a random
number to .
In the pseudo-random number sequence, the source value of a random number is calculated at every time, and this
instruction calculates a pseudo-random number using the source value.
Pseudo-random number calculation equation:
(D8311, D8310) = (D8311, D8310) *
1
× 1103515245 + 12345.....(1)
= “([D8311, D8310]>>16)&<logical product>00007FFFh”
*1. To (D8311, D8310), write a non-negative value (0 to 2,147,483,647) only once when the PLC mode switches
from STOP to RUN.
[K1 is written to (D8311, D8310) as the initial value when the power is restored.]
Program example
In the program example shown below, a random number is stored to D100 every time X010 turns ON.
When the PLC mode switches from STOP to RUN, the time data converted into seconds and added by the value
“(Year + Month) × Day” is written to D8311 and D8310.
Operand Type Description Data Type
Head device number storing a random number 16-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
V Z Modify K H E "
"P
3333333 3 3
P
FNC 184
RND
Mnemonic Operation Condition
16-bit Instruction
3 steps
RND
RNDP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
⎯
⎯
D
D
D
FNC 184
RND
Command
input
D
D
Data in hour, minute and second
→
Data in second
X010
FNC184
RNDP
D100
END
M8002
FNC166
TRD
D0
FNC164
DHTOS
D14D3
FNC 20
ADD
D10D1D0
FNC 20
DADD
D8310D12D14
The clock data is read.
The data in second is added by the value “(Year +
Month)
×
Day”, and written to D8311 and D8310.
FNC 23
MUL
D12D2D10