Campbell CR800 Especificações descarregar pdf (Página 124)

Section 6. Data Table Declarations and Output Processing Instructions

6-6

WorstCase (TableName, NumCases, MaxMin, Change, RankVar)

Allows saving the most significant or “worst-case” events in separate data

tables.

A data table is created that is sized to hold one event. This table acts as the

event buffer. Each event that occurs is stored to this table. This table may use

the DataEvent instruction or some other condition to determine when an event

is stored. The significance of an event is determined by an algorithm in the

program and a numerical ranking of the event is stored in a variable.

WorstCase creates as many clones of the specified table as the number of cases

for which to keep data. When WorstCase is executed, it checks the ranking

variable; if the value of the variable is a new worst case, the data in the event

table replace the data in the cloned table that holds the least significant event

currently stored.

An additional data table, nameWC (e.g., EvntWC) is created that holds the

values of the rank variables for each of the worst case tables and the time that

that table was stored.

WorstCase must be used with data tables sent to the CR800 SRAM. It will not

work if the event table is sent to the CF card.

While WorstCase acts as Trigger Modifier and a data table declaration

(creating the cloned data tables), it is entered within the program to call the

worst case tables (see example).

Parameter

& Data Type

Enter

TableName

name

The name of the data table to clone. The length of this name should be 6 characters or

less so the complete names of the worst case tables are retained when collected (see

NumCases).

NumCases

The number of “worst” cases to store. This is the number of clones of the data table to

create. The cloned tables use the name of the table being cloned (up to the first 6

characters) plus a 2 digit number (e.g., Evnt01, Evnt02, Evnt03, …). The numbers give

the tables unique names, they have no relationship to the ranking of the events.

MaxMin

A code specifying whether the maximum or minimum events should be saved.

Constant

Value Result

Min, save the events associated with the minimum ranking; i.e.,

Keep track of the RankVar associated with each event stored.

If a new RankVar is less than previous maximum, copy the

event over the event with previous maximum)

Max, save the events associated with the maximum ranking;

i.e., copy if RankVar is greater than previous lowest (over event

with previous minimum)

Change

Constant

The minimum change that must occur in the RankVariable before a new worst case is

stored.

RankVar

Variable

The Variable to rank the events by.

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