Remote-processing BASIC for the CX-10 Modbus Manual de usuario descargar pdf (Pagina 44)

BASIC PROGRAMMING GUIDE

2-35

ONERR

Syntax: ONERR

line number

Function: Goes to

line number

on arithmetic error, bad argument, and hardware errors.

Mode: Run

Use: ONERR 1000

DESCRIPTION

The ONERR instruction traps arithmetic errors and hardware problems, transferring control to

line number

ONERR can be used to handle errors generated due to bad user input from and INPUT instruction. ONERR

is a GOTO, not a GOSUB. Consequently, there is no easy way to resume program execution. The control

and argument stacks are cleared so all GOSUB's, FOR-NEXT loops, etc. are cleared.

Error codes are stored at external memory location 257 (101H) and are accessed using the XBY instruction.

Code Error

0AH (10) DIVIDE BY ZERO

14H (20) ARITH OVERFLOW

1EH (30) ARITH UNDERFLOW

28H (40) BAD ARGUMENT

32H (50) HARDWARE

EXAMPLE

100 ONERR 1000

110 A=1/0

1000 PRINT "Error code:",XBY(257)

>run

Error code: 10

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 83 84

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Remote-processing BASIC for the CX-10 Modbus Manual de usuario Pagina 44