Campbell CR5000 Spécifications télécharger pdf (Page 85)

Section 4. CRBasic - Native Language Programming

4-9

4.7 Parameter Types

Instructions parameters allow different types of inputs these types are listed

below and specifically identified in the description of the parameter in the

following sections or in PC9000 CRBasic help.

Constant

Variable

Variable or Array

Constant, Variable, or Expression

Constant, Variable, Array, or Expression

Name

Name or list of Names

Variable, or Expression

Variable, Array, or Expression

Table 4.7-1 list the maximum length and allowed characters for the names for

Variables, Arrays, Constants, etc.

TABLE 4.7-1. Rules for Names

Name for Maximum Length (number of

characters)

Allowed characters

Variable or Array 16 Letters A-Z, upper or lower.

Constant 16 case, underscore “_”, and

Alias 16 numbers 0-9. The name must

Data Table Name 8 start with a letter. CRBasic is

Field name 16 not case sensitive

4.7.1 Expressions in Parameters

Many parameters allow the entry of expressions. If an expression is a

comparison, it will return -1 if the comparison is true and 0 if it is false

(Section 4.5.3). An example of the use of this is in the DataTable instruction

where the trigger condition can be entered as an expression. Suppose the

variable TC(1) is a thermocouple temperature:

DataTable(Name, TrigVar, Size)

DataTable(Temp, TC(1)>100, 5000)

Entering the trigger as the expression, TC(1)>100, will cause the trigger to be

true and data to be stored whenever the temperature TC(1) is greater than 100.

4.7.2 Arrays of Multipliers Offsets for Sensor Calibration

If variable arrays are used as the multiplier and offset parameters in

measurements that use repetitions, the instruction will automatically step

through the multiplier and offset arrays as it steps through the channels. This

allows a single measurement instruction to measure a series of individually

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Campbell CR5000 Spécifications Page 85