IAI IA-101-TT-USB, Operation Manual

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9. Symbol Edit W
indow
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9. Symbol Edit Window
9.1 About Symbols
In the X-SEL controller, variable numbers, flag numbers and other values can be treated as symbols.
(1) Values supporting symbol conversion
The following values can be treated as symbols:
Variable number, flag number, tag number, subroutine number, program number, position number, input
port number, output port number, input/output ports, axis number, constant
(2) Symbol description rules
[1] First character: A single-byte alphabet or single-byte underscore.
[2] Second and subsequent characters: Any characters corresponding to ASCII codes 0x21 to 0x7e that
can be entered from the keyboard.
[3] Maximum number of characters: 9 single-byte characters (or 8 single-byte characters in the case of
a character string literal).
[4] Definition of the same symbol for two or more values within a given function is prohibited. (The same
symbol can be defined for two or more local values that are each used in a different program.)
[5] Definition of the same symbol for two or more flag numbers, input ports, output ports and/or
input/output ports is prohibited.
(The same symbol can be defined for two or more local flags/ports that are each used in a different
program.)
[6] Definition of the same symbol for two or more integer variable numbers and/or real variable numbers
is prohibited.
(The same symbol can be defined for two or more local variables that are each used in a different
program.)
[7] Definition of the same symbol for two or more integer constants and/or real constants is prohibited.
(3) Number of symbol definitions: Up to 1,000 (Up to 500 for SSEL (not applicable for memory capacity
increase), ASEL and PSEL controllers
、
Up to 1000 for SSEL (applicable for memory capacity increase))
(4) Number of symbol uses allowed in commands: Up to 5,000 times including character string literals
(Up to 2,000 times for ASEL and PSEL controllers)
* Defining the input condition, operands 1 and 2 and output in a step all using symbols is equivalent to
four symbol uses in one step.