Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 313)

100

101

Reference

Programming Reference

B–25

Estimating Memory Usage for Your Control System

Use the following to calculate memory usage for your control system.

The result of this calculation will be the estimated

total memory remaining in your selected

controller.

Subtract the total memory usage from 1024.

Note The

calculated memory usage may vary fr

om the

actual compiled pr

ogram by

±12%.

1. Determine the total instruction words used by the

instructions in your program and enter the result.

Refer to the table on page B–21.

2. Multiply the total number of rungs by 0.75 and

enter the result. Do not count the END rungs in

each file.

3. To account for controller overhead, use 177.

4. To account for application data, use 110.

5. T

otal steps 1 through 4. This is the estimated total

memory usage of your application system.

Remember

, this is an estimate, actual compiled

programs may differ by ±12%.

6. To determine the estimated amount of memory

remaining in the controller you have selected, do

the following:

Total Memory Usage:

177

110

1024

Total Memory

Remaining:

Total Memory Usage

(from above):

1 2 ... 308 309 310 311 312 313 314 315 316 317 318 ... 421 422

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