Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 93)

Error Reporting

Chapter 7

74

Note that an ON_ERROR or an IF command may contain an embedded

command to execute another procedure. In these cases, the embedded

execute command is treated just like a nesting level. Figure 7.2 illustrates

this point for an ON_ERROR command. In this figure, an addressing

error in line 10 of procedure MAIN causes activation of the ON_ERROR

command, which calls for execution of procedure SAM. But SAM also

contains an error. The error in SAM is the last one detected, so it is the

one finally reported in the error block. Since procedure SAM is called by

the ON_ERROR command in procedure MAIN, the nesting for SAM is 2

levels deep.

Figure 7.2

Examples

of ON_ERROR Nesting

MAIN

SAM

Line Number Procedure Word

Error Block

160

10031–I

ON_ERROR @SAM

7.2 = 1000

Contents (decimal)

•

$25:0 = N

•

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 93