IAI America ASEL - Manual (Page 101)

Part 2 Programs
Chapter 1 SEL
Language Data
79
Part 2 Programs
1.8 Symbols
In the ASEL Controller, values such as variable numbers and flag numbers can be handled as symbols.
For the method to edit symbols, refer to “Editing Symbols” in the operation manual for PSEL teaching
pendant or “Symbol Edit Window” in the operation manual for PSEL PC software.
(1) Supported symbols
The following items can be expressed using symbols:
Variable number, flag number, tag number, subroutine number, program number, position number,
input port number, output port number, axis number, constant
(2) Description rules of symbols
[1] A maximum of nine single-byte alphanumeric characters or underscore starting with an alphabet
(Note: The length of a character-string literal must not exceed eight single-byte characters.)
* Exercise caution that the same ASCII code may be expressed differently between the PC
software and the teaching pendant because of the different fonts used by the two. (The same
applies to character-string literals.)
5Ch --- PC software: Backslash \ (overseas specifications, etc.)
Teaching pendant: Yen mark ¥
7Eh --- PC software: ~
Teaching pendant: Right arrow o
[2] Symbols of the same name must not be defined within each function. (The same local symbol
can be used in different programs.)
[3] Symbols of the same name must not be defined within the flag number, input-port number or
output-port number group. (The same local symbol can be used in different programs.)
[4] Symbols of the same name must not be defined within the integer-variable number or real-
variable number group. (The same local symbol can be used in different programs.)
[5] Symbols of the same name must not be defined within the integer constant or real constant
group.
(3) Number of symbols that can be defined: Maximum 500
(4) Number of times symbols can be used in all SEL programs: Maximum 2500 times including
character-string literals
* If symbol is used in all of the input condition, operand 1, operand 2 and output fields, it is deemed
that symbol is used four times in one step.
1.9 Character-String Literals
Character-string literals are used in certain string-operation commands and consist of the portion enclosed
by single quotation marks (‘ ‘) (maximum eight single-byte characters).
With the PC software, single-byte ASCII code characters from 20h to 7Eh (limited to those that can be
input via keyboard) can be used inside the single quotation marks. With the teaching pendant, single-byte
alphanumeric characters and single-byte underscores can be used.