Special Real-Time Variables For Synchronized Actions - Siemens SINUMERIK 840Di sl Function Manual

Detailed description

2.3 Special real-time variables for synchronized actions

Indexing
The index of a main-run field variable can in turn be a real-time variable.
Example
WHEN ... DO $AC_PARAM[ $AC_MARKER[1] ] = 3
The index $AC_MARKER[1] is evaluated currently in the interpolation cycle.
Constraints:
• It is not permissible to nest indices with real-time variables.
• A real-time index cannot be generated by a variable that is not generated itself in real
2.3 Special real-time variables for synchronized actions
For a complete list of the system variables that can be addressed, see references:
/PGA1/ Parameter Manual, System Variables.
The system variables that can be addressed in synchronous actions are in the field SA:
identified as "Can be used in synchronized actions". A system variable that is updated during
the main run is also synchronized in the main run if this is selected in the HL Sync field and
then confirmed.
The characteristics of a few special main run variables are described below:
• Marker/counter variables
• Timers
• Synchronized action parameters
• R parameters
• Machine and setting data
• FIFO variables (circulating memory)
SW 4
The special real-time variables: Timers, R parameters, machine and setting data and FIFO
variables are available in SW 4 and later.
28
time. The following programming would lead to errors:
$AC_PARAM[1]=$P_EP[$AC_MARKER[0]
– Channel-specific markers
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Synchronized actions