Siemens SINUMERIK 840D sl Commissioning Manual page 733

Note
It should be noted that the number of registers is restricted and the list of variables cannot
exceed 500 characters.
Example
MRNP("$R[0]*$R[1]*$R[2]*$R[3]",1)
Reading display machine data:
Display machine data can be read with RNP ($MM...) within the LOAD block.
General read/write access to display machine data is not possible using "Run MyScreens".
Note
User variables may not have the same names as system or PLC variables.
NC variable
All machine data, setting data and R parameters are available, but only certain system
variables (see also: List of accessible system variables (Page 170)).
All global and channel-specific user variables (GUDs) can be accessed. However, local and
program-global user variables cannot be processed.
Machine data
Global machine data
Axis-specific machine data
Channel-specific machine data
Setting data
Global setting data
Axis-specific setting data
Channel-specific setting data
System variables
R parameter 1
SINUMERIK Integrate Run MyScreens (BE2)
Programming Manual, 03/2013, 6FC5397-1DP40-3BA1
;The values of variables $R[0] to $R[3] are
written to REG[1] to REG[4].
$MN_...
$MA_...
$MC_...
$SN_...
$SA_...
$SC_...
$R[1]
Programming commands
6.3 Functions
115