Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 226)

Chapter

Call Routines 0–68

12 -36

Use CALL 38 to expand the type of errors the ONERR statement (page

11 -23) traps and handles.

The ONERR statement only allows the BASIC module to jump to an error

handling routine when it encounters an arithmetic error (number too large,

number too small, bad argument or division by zero occurs). All other

errors cause the module to enter Command mode. When you initiate

CALL 38, you allow ONERR to service other errors (except hardware

errors–watchdog, time-out, RAM failure, etc.) the BASIC module

encounters instead of returning to Command mode.

If any error occurs that causes a restart, stacks are cleared. Variables and

ports, however, are not re-initialized. This call has no effect until you

execute the ONERR statement within the program. This call is reset when

the BASIC module returns to the Command mode. You must re-execute

CALL 38 every time you enter Run mode.

Use CALL 0 (page 12 -2) if you want to reset the module within the error

routine.

Input and Output Arguments

This routine has one input and no output arguments. The input argument

determines if the expanded ONERR function is enabled or disabled:

0 = disable the expanded ONERR restart

1 (or any other number) = enable the expanded restart

If you perform an XBY in the error routine, this a list of the status codes

you might receive.

Status code Description

BASIC module attempted to call an illegal call number

02 port has been assigned an invalid parameter

03 string has not been dimensioned

04 defined string length is too small for operation

05 memory has not been allocated for this string

06 attempted to transfer to a RAM or ROM program that did not exist

07 command or call can only be executed from Command mode

08 user PROM has invalid checksum

09 this statement or call requires a user PROM; no user PROM is installed

10 divide by zero

11 DH-485 call executed and DH485 port not enabled

12 argument stack problem

13 syntax error

14 control stack problem

15 array size problem

16 internal processor stack problem

CALL 38: Expanded ONERR

Restart

Tip

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