Linking Files - HEIDENHAIN iTNC 530 HSCI Technical Manual

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9.15 Linking Files

You can store the source code of the PLC program in several files. To manage

these files, use the following commands:

These statements must be located at the beginning of your PLC program—

i.e., before the first PLC command. With the USES statement you link another

file into the program. The GLOBAL statement supplies a label from its own file

for an entry that can be used by all other files. The EXTERN statement

provides a label that is defined in another file and is identified there with

GLOBAL. You can then call this label from the active file. You can dramatically

improve the transparency of your program by dividing your source code by

function into individual groups and then save these groups in individual files.

The number of labels is not limited. You can link up to 256 files to one program.

The total size is only limited by the available memory. If the memory is

exceeded the error message System memory overflow appears. With multiple

files, the main program in the directory must have the "M" status flag. This can

be done in RAM by using the PLC program function "COMPILE" once and

choosing the main program in the file window.

HEIDENHAIN Technical Manual iTNC 530 HSCI