Configuring Siemens 840D GUD String Concatenation Guide

Build the Delimited GUD String

Use the Siemens 840D string concatenation operator << to combine GUD values and literal delimiters. The confirmed example used semicolons; substitute a colon when the receiving format requires colon-separated values.

VARSTRING = <<GUDVAR1<<":"<<GUDVAR2<<":"<<GUDVAR3

The evidence does not identify the GUD data types or the required VARSTRING capacity. Declare the destination string with enough space for every formatted value plus the two delimiters.

Resolve the Delimiter Ambiguity

The original requirement specifies colons, while the confirmed expression uses semicolons. Select the delimiter required by the downstream parser and verify the final string rather than assuming the two formats are interchangeable.

Write GUD Values to a File

The supplied program uses WRITE with an integer error variable and the path /_N_WKS_DIR/_N_. It creates a file name from DATEN_GUD and _MPF, then writes the controller date, time, and individual GUD values.

DEF INT ERROR
DEF STRING[120] PATH_NAME="/_N_WKS_DIR/_N_"

WRITE(ERROR,PATH_NAME<<"DATEN_GUD"<<"_MPF",
      "GUDVAR1 ="<<GUDVAR1)
IF ERROR==10 GOTOF DATENVOLL
IF ERROR<>0 GOTOF FEHLER

This demonstrates writing into the stated controller directory. It does not identify a diskette destination, so do not treat the path as proof of direct removable-media storage.

Handle and Verify Write Results

1. Execute each WRITE call with ERROR as its result variable.
2. If ERROR==10, branch to the file-capacity handler. The supplied handler directs the engineer to review MD11420, identified there as MAX.PROT.LAENGE.
3. If ERROR<>0 for any other result, branch to a general write-error handler and display the returned code.
4. After a zero result, open or otherwise inspect the generated file and confirm the delimiters, GUD names, current values, and date/time fields.

The evidence defines special handling only for error code 10. Diagnose any other returned code using the documentation applicable to the installed 840D configuration.

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