KEYENCE Visual KV Series - Manual (Page 28)

1.2 User Memory
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Chapter 1 Programming
1.2 User Memory
This section describes the allowable size (capacity) of a program which can be
created in the Visual KV Series.
1.2.1 Program Capacity
When a user program is created for the Visual KV Series, the maximum number of
steps a program can contain using the mnemonic diagram varies based on the byte
count of the instructions used. The instruction byte count is determined individually
for each instruction.
➮ For more about byte counts for each instruction, refer to "2.1 Instruction List" (p.3-34).
Maximum number of lines in a program
In the KV-10xx/16xx, a program with approximately 2,000 steps can be written. In
the KV-24xx/40xx, a program with approximately 4,000 steps can be written.
• Total byte count of the memory used by instructions ≤ 6,000 bytes / 12,000
bytes
• Total byte count of the memory used by objects of instructions ≤ 12,000
bytes / 24,000 bytes
* In the description above, a value on the left side indicates the byte count for
the KV-10xx/16xx, while a value on the right side indicates the byte count for
the KV-24xx/40xx.
* The memory occupied by objects indicates the memory required to execute a
program when operation is started.
For example, the allowable number of steps to be written can be calculated from the
memory occupied by the instructions as follows.
12,000 bytes / 3 bytes (average byte count of an instruction) = 4,000 steps
Note: If either the memory occupied by the instructions or the memory occupied by
objects of a program exceeds the specified memory capacity, the program cannot
be written or executed.
Calculating the byte count used
The byte count used in this program can be calculated as shown in the table below.
T000 0500
0000
0500
#00020
T000
Line No. Instruction Operand Byte count Number of objects
00000 LD 0000 3 5
00001 OR 0500 3 4
00002 TMR 000#00020 2 7
00003 ANB T000 3 8
00004 OUT 0500 3 8
Total 14 bytes 32 bytes
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