Siemens sinumerik 840d Programming Manual page 22

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Flexible NC Programming

Variables and arithmetic parameters

Variables and arithmetic parameters

Variables can be used instead of fixed values to

increase the flexibility of a program. You can

respond to signals such as measured values or, by

storing setpoints in the variables, you can use the

same program for different geometries.

A skilled programmer can use variable calculation

and program jumps to create a highly flexible

program archive which will considerably reduce the

programming work required.

Types of variables

The control distinguishes between three types of

User-defined variables

Arithmetic parameters

System variable

Variables whose name and type are defined

by the user, e.g. arithmetic parameters.

Special predefined arithmetic variables for

which address R, followed by the number, is

provided. The predefined arithmetic

variables are type REAL.

Variables provided by the control which can

be processed (read/written) in the program.

System variables provide access to zero

offsets, tool offsets, actual values, measured

values on the axes, control states, etc. (See

Appendix for the meaning of the system

SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition

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