616
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.]
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
VZModifyKH E "
"P
3 3 3 3333 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
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