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AĆ2 Appendix A: Loading and Sizing Calculations

Original Ć June 1990CE4.2:CL6211

Table AĆ1. Maximum Controller Loading Values

Controller Units

Simplex Computing:

4 hertz version 4500

10 hertz version 1500

20 hertz version 600

Redundant Computing 4100

Simplex Interactive (All Models):

4 hertz version 4150

10 hertz version 1200

20 hertz version 400

Redundant Interactive (All Models) 3900

A.1.1 Simplex Controller Loading

To determine the processor loading for a simplex computing or

interactive controller, perform the following steps:

1. Multiply the number of operator stations (refer to the number of

operator station ports defined in the Operator Station Definition portion

of the device definition) to be connected to the controller by 163 for a

computing controller, or by 201 for an interactive controller. Record this

figure.

2. Count the number of indirect control points (ICPs) defined in the

Analog and Discrete ICP Point sections of configuration. For a

computing controller, multiply this number by 101 and record the result.

For an interactive controller, multiply this number by 130 and record the

result.

3. Count the number of direct control points (DCPs) defined in the DCP

Point Definition sections of configuration. For a computing controller,

multiply this number by 113 and record the result. For an interactive

controller, multiply this number by 188 and record the result.

4. Total the loading values of each FST function defined in the FST

section of configuration (refer to Table AĆ2, beginning on page AĆ7, for

FST function loading values). Record the result.

5. Count the number of functions used in the FST, and record this

number.

6. (This step is for communicating systems only. If the controller is not

connected to a data concentrator, proceed to step 7.) For a computing

controller, write down 234. For an interactive controller, write down 272.

This figure represents the base data concentrator communications load.

1 2 ... 273 274 275 276 277 278 279 280 281 282 283 ... 319 320

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