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24 Applied Instructions (Others)
24.2 RND / Random Number Generation
587
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
21
Applied Instructions
(Real Time
Clock Control)
22
Applied Instructions
(External Device)
23
Applied Instructions
(Extension
Function)
24
Applied Instructions
(Others)
25
Applied Instructions
(Block Data
Operation)
26
Applied Instructions
(Character
String Control)
27
Applied Instructions
(Data Operation 3)
28
Applied Instructions
(Data Comparison)
29
Applied Instructions
(Data Table
Operation)
30
Applied Instructions
(External Device
Communication)
24.2 RND / Random Number Generation
Outline
This instruction generates random numbers.
1. Format and operation, execution form
2. Set data
3. Applicable devices
Function and operation explanation
1. 16-bit operation (RND/RNDP)
This instruction generates a pseudo-random number within the range from 0 to 32767, and stores it as a
random number to the device specified by .
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
× 103515245+12345...1)
d = "[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.]
FX3U(C) FX3G(C) FX3S FX2N(C) FX1N(C) FX1S FXU/FX2C FX0N FX0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder/FBD ST
RND 16 bits Continuous RND(EN,d);
RNDP 16 bits Pulse RNDP(EN,d);
Variable Description Data type
Input
variable
EN Execution condition Bit
Output
variable
ENO Execution state Bit
Head device storing a random number ANY16
Operand
type
Bit Devices Word Devices Others
System user Digit specification
System
user
Special
unit
Index
Cons
tant
Real
Number
Character
String
Pointer
XYMTCS
D.b
KnX KnY KnM KnS T C D R
U\G
V Z Modifier K H E
""
P
zzzzzzz z z
RND
EN ENO
d
RNDP
EN ENO
d
RND
EN ENO
d
Head device storing
a random number
Command
input