Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 42)

Operating Functions

Chapter 5

5–5

The argument stack (A-stack) stores all constants that the BASIC Module

is currently using. Operations such as add, subtract, multiply and divide

always operate on the first two numbers on the argument stack and

return the result to the stack. The argument stack is 203 bytes long.

Each floating point number placed on the stack requires 6 bytes of

storage. The argument stack can hold up to 33 floating point numbers

before overflowing.

The control stack (C-stack) stores all information associated with loop

control (i.e. DO-WHILE, DO-UNTIL, FOR-NEXT, BASIC subroutines

and “PUSHed” or “POPed” values). The control stack is 157 bytes long.

DO-WHILE and DO-UNTIL loops use 3 bytes of control stack.

FOR-NEXT loops use 17 bytes. The control stack contains enough

space for up to 9 nestings of control loops.

5.2.12

Argument

Stack

5.2.13

Control Stack

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 166 167

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 42