ACR Electronics FPR-10 PROGRAMMER Manual descarregar pdf (Página 41)

Parker Hannifin

System Configuration 41

• Arrays: The factory default provides no memory allocated to

arrays. After allocating memory, these items are available only

within the specified program.

How Much Memory?

There are no simple guidelines to determine how much memory your

programs might require; the needs of each application are different.

It also depends how you intend to develop programs for the

controller.

If you just sit down and begin writing code through the ACR-View

software, consider allocating more memory than you think you

might need. As you get closer to completion, you can scale back

the memory allocations as appropriate.

You can also write the programs first, determine how much memory

it uses, and dimension what is necessary.

The following table shows memory usage by various data and

program structures. Use it to help determine how much memory is

needed for each program:

Data/Program Structure Memory Usage

LV variables 4 bytes per element (32-bit integers)

SV variables 4 bytes per element (32-bit floating point)

DV variables 8 bytes per element (64-bit floating point)

$V variables 4 bytes + 1 byte per character

Array references 4 bytes per array reference + 4 bytes

LA arrays 4 bytes per element + 4 bytes

SA arrays 4 bytes per element + 4 bytes

DA arrays 8 bytes per element + 4 bytes

$A arrays 1 byte per character

Commands 4 bytes per command

Parametric Statements 4 bytes per operator

Long Constants 4 bytes per constant (32-bit integer)

Single Constants 4 bytes per constant (32-bit floating point)

Double Constants 8 bytes per constant (64-bit floating point)

String Constants 4 bytes + 1 byte per character

Subroutine Calls 4 bytes per level

Aliases (#DEFINE) 48 bytes per define + 16 bytes

Move Buffer (MBUF) 136 bytes per move

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 198 199

Sem comentários

ACR Electronics FPR-10 PROGRAMMER Manual Página 41