Siemens SINUMERIK 828D Function Manual page 18

Detailed description
2.3 System variables for synchronized actions
System variables
Generally, all system variables that can be used in synchronized actions are read/written in
the main run. These system variables are marked with an "X" in the "Read" and/or "Write"
line of the "SA" (synchronized action) column in the "System Variables" Parameter Manual.
References:
System Variables Parameter Manual
System of the identifiers
The identifiers of the system variables that are read/written in the main run have the
following system:
$A...
$V...
$R...
$$M...
$$S...
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Current main run data
Servo data
R parameters to be read/written in the main run
Machine data to be read/written in the main run
Setting data to be read/written in the main run
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
Synchronized actions