Response Electronics CL6011B Especificaciones descargar pdf (Pagina 281)

AĆ5Appendix A: Loading and Sizing Calculations

Original Ć June 1990 CE4.2:CL6211

6. Multiply the number of FST steps defined in the FST section of

configuration by 4.4. Record the result.

7. Add the figures recorded in Steps 1 through 6 to obtain the

approximate RAM usage. If the total does not exceed 1328 for a

computing controller, or 6848 for an interactive controller, the controller is

adequately sized. If the total exceeds these values, check your

calculations for correctness. If the calculations are correct, take one or

more of the following actions:

H If the total is only a little higher than the maximum (about 5 percent), the

configuration may still be acceptable. If possible, try it out by performing

configuration entry (see the system user manual) and then downloading

it into a controller of the same type for which the configuration is

intended.

H Delete any general register cross references and operating data cross

references that are not needed (subtract 2 from the total for each cross

reference that you delete).

H Delete any general registers (subtract 5 for each one deleted), general

or required.

H Reduce the number of steps in the FST or the number of any other

configuration items.

H If a computing controller is being sized, use a 2-wide interactive

controller instead.

H If an interactive controller is being sized, place part of the control strategy

into a computing controller, or into another interactive controller.

A.2.2 Redundant Controller Sizing

To determine the RAM sizing for a redundant computing or interactive

controller package, perform the following steps:

1. Write down 170. This figure represents the typical overhead value

required for each controller.

2. Count the number of general registers defined in the FST Registers

form. Multiply this number by 18 and record the result.

3. Count the number of auxiliary engineering unit pairs (AEUPs) defined

in the AUX EU Definition form. Multiply this number by 15 and record the

result.

4. Count the number of ICPs defined in the Analog and Discrete ICP

Point sections of configuration. Multiply this number by 28 and record

the result.

5. Count the number of DCPs defined in the DCP Point Definition

sections of configuration. Multiply this number by 255 and record the

result.

1 2 ... 276 277 278 279 280 281 282 283 284 285 286 ... 319 320

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Response Electronics CL6011B Especificaciones Pagina 281