SYMBOL symbolname = value
SYMBOL symbolname = value ?? constant
Symbolname - is a text string which must begin with an alpha-character or '_'. After the first character, it can also contains number characters ('0'-'9').
Value - is a variable or constant which is being given an alternate symbolname.
?? - can be any supported mathematical function e.g. + - * / etc.
Assign a value to a new symbol name or create an alias for a variable name.
Mathematical operators can also be used on constants (not variables) Symbols are used to rename constants or variables to make them easier to remember during a program. Symbols have no effect on program length as they are converted back into 'numbers' before the download. Symbols can contain numeric characters, but must not start with a numeric character.
Naturally symbol names cannot be command names or reserved words such as input, step, etc. The list of reserved words is listed in the appendix in part 3 of the manual. When using input and output pin definitions take care to use the term 'pin0' not '0' when describing input variables to be used within if...then statements.
Use of symbols
Use symbols instead of output, input and variable numbers
- Code Example:
symbol RED_LED = B.7 ; define a output pin symbol PUSH_SW = pinC.1 ; define a input switch symbol DELAY = b0 ; define a variable symbol let DELAY = 200 ; preload counter with 200 main: high RED_LED ; switch on output 7 pause DELAY ; wait 0.2 seconds low RED_LED ; switch off output 7 pause DELAY ; wait 0.2 seconds goto main ; loop back to startCopy Code Submit an Example
Submit Your Own Code!
You must be logged in to submit code examples. Login now.