Magnavox W-10CR Installationsanleitung PDF herunterladen (Seite 77)

Programming Commands 61

7.1.6 Program Limits

When writing an MX program please observe the follow-

ing maximum values; otherwise the project will not com-

pile.

Item Maximum Allowed

Line labels 100 total per task

Local Variables 100 total per task

Common Variables 100 total per project

Literal’ s 100 total per project

DATA Elements 100 total per task

Nested FOR loops 100 total per task

Nester DO loops 100 total per task

7.1.7 Numeric Formats and Range

Numeric data may be represented in standard format or in

scientific notion format. The following are illustration of

each type of format.

Standard format:

1234567

-1.234567

0.1234567

1234.567

etc

Scientific notation format

2e6 (2,000,000)

2.0456e4 (20,456)

-3.14159e0 (-3.14159)

6.78e-2 (0.0678)

etc

The largest number that can be used is 3.4e38. The small-

est number that can be used is 2.9e-39. The numeric reso-

lution is 1 part in 8,388,608 or 1.2e-7.

7.1.8 Program Comments

An apostrophe (‘) in a program line prevents a line from

executing and allows program comments /documentation.

All text to the right of the ‘ to the end of line is not consid-

ered part of the command during execution.

Examples:

‘MOVE=10 The program will not execute this line

MOVE=100 ‘The program will execute this line

7.1.9 Axis Related Command Syntax

The syntax for programming commands has numerous

choices. Some are I/O related and some are axis related.

The I/O related syntax’s are covered in detail for that spe-

cific command. However, the axis related commands are so

numerous that they will be covered in this section of the

manual.

7.1.9.1 Definitions Used in Syntax

Descriptions

COMMAND represents an arbitrary axis command.

Expression

One or more constants, variables or commands that return

data operated on by mathematical operators or mathemati-

cal functions. Expressions can be very simple (as in the

case of a single constant or variable) or quite complex (as

shown in the last example below). The compiler will indi-

cate an error if an expression is too complex. For all practi-

cal purposes it is not possible to write an expression that

is too complex.

The following are all valid expressions:

5.2 (single constant)

X (single variable)

SPEED(2) (command)

X+3 (addition of variable and constant)

SIN(X-3) (sine function of the difference of a

variable and constant)

(X+3)*SIN(Y)/(Z+SQRT(X)) (complicated

expression)

axis

Specifies the axis on which the command is performed.

Axis is specified as an expression that evaluates to the

desired axis number. If the expression evaluates to a non-

whole number, then the nearest whole number less than

the expression value is used. Axis is most commonly

specified as a constant.

Example: COMMAND(x+2)

with x = 1.5 is equivalent to COMMAND(3)

[text]

Denotes 0 or more occurrences of what is enclosed by the

brackets. The brackets are not part of the syntax.

7.1.9.2 Syntax Descriptions

COMMAND(axis) = expression

Execute the command, on the specified axis, using the data

supplied by the expression.

Syntax example: MOVE(2) = 10

performs an index motion of 10 units on axis 2

COMMAND = expression list

Execute the command, on the 1 or more specified axes,

using the data supplied by the expression list.

expression list

1 to N expressions. Commas follow each expression in the

list except for the last one. (N = number of axes in the con-

troller: 2,4,6 or 8) The first expression in the list is for axis

1, the next for axis 2, etc. To skip an axis, simply enter a

comma for that axis. Although these examples use con-

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 321 322

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