Main Run Variables For Synchronized Actions; System Variables - Siemens SINUMERIK 828D Programming Manual

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Motion synchronous actions

10.3 Main run variables for synchronized actions

Main run variables for synchronized actions

NC data can be read and written with the help of system variables. A distinction is made

between preprocessing and main run system variables. Preprocessing variables are always

executed at the preprocessing time. Main run variables always calculate their value with

reference to the current main run status.

Generally, the system variable names start with a "$" character:

Preprocessing variables:

Main run variables:

A 2nd letter describes options for accessing the variable:

The 2nd letter is usually only used for main run variables. Preprocessing variables, such as

e.g. $P_, are usually executed without the 2nd letter.

An underscore and the subsequent variable name (usually an English designation or

abbreviation) follow the prefix ($ followed by one or two letters).

Machine data

Setting data, protection zones

Tool management data

Programmed values, preprocessing data

Cycle variables of the ISO envelope cycles

R parameters

Actual main run data

R parameters

NCK global value (generally valid value)

Channel-specific value

Axis-specific value

Programming Manual, 07/2010, 6FC5398-2BP40-0BA0

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