Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 308)

100

101

Chapter

Call Routines 69–127

13 -50

Use this call to execute a user generated assembly language routine.

This call performs some preliminary checks. If all the checks pass, then

the user generated code is executed.

Input and Output Arguments

The number of input and output arguments are user defined. There must

be at least one input argument. The last input argument must be the

absolute address of the first byte of the header which precedes the routine.

The user generated assembly language code must be preceded by a four

byte header and followed by a two byte footer:

first header byte must be a AAH

second header byte must be a 55H

third header byte absolute address of the first byte of footer

fourth header byte absolute address of the first byte of footer

first footer byte must be a 55H

second footer byte must be a AAH

If any of the checks fail, then the stack is cleared, an error message is

printed to the program port and the BASIC code execution stops.

Important: Programming the BASIC module with assembly language is

extremely difficult and complex. Allen-Bradley does not support assembly

language programming with the BASIC module. We recommend you

instead use the C tool kit and C compiler available from one of our

Pyramid Solutions Program Partners.

Syntax

PUSH

address

CALL 116

Example

100 PUSH 8000H : CALL 116

110 POP a,B,C

CALL

16: Call User

Defined Assembly Language

Routine

1 2 ... 303 304 305 306 307 308 309 310 311 312 313 ... 393 394

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