
AĆ1Appendix A: Loading and Sizing Calculations
Original Ć June 1990 CE4.2:CL6211
A Loading and Sizing Calculations
To determine whether or not a controller is adequate for a given
application (before actually downloading the configuration to it), loading
and sizing calculations must be performed.
Processor loading is presented first, with one procedure for a simplex
(non-redundant) controller and one for a redundant controller. RAM
sizing is discussed next, and is likewise divided into two procedures.
Keep in mind that these loading and sizing calculations are only
approximations; in a close fit" situation, contact your Fisher sales office
or sales representative for recommendations.
Note:
For controllers in systems with a personal computer or
a console serving as the operator interface, the
equivalent of sizing calculations is available through
on-line diagnostic programs. After the configuration
has been downloaded to the controller, the diagnostic
program can be used to determine the actual loading
of the controller. Refer to the maintenance manual for
further information.
A.1 Loading Calculations
The following sections provide instructions for calculating controller
loading. Refer to Table AĆ1 to determine the maximum number of unit
loads for each controller type.
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