Siemens SINUMERIK 840D sl Function Manual page 388

Data Description
8.4 System variables
System variables $A_OUTSEPD[1,2]
Images of the PLC–side external SPL output signals (status signals from the PLC–
SPL) can be read in a double–word–serial fashion (32 bit) using these system vari-
ables.
Associated DB18 values:
System variables $A_MARKERSIP[1..64]
Images of the PLC–side SPL markers can be read using these system variables.
Associated DB18 values:
System variables $A_MARKERSIPD[1,2]
Images of the PLC–side SPL markers can be read in a double–word–serial fashion
(32 bit) using these system variables.
Associated DB18 values:
System variable $A_PLCSIIN[1..32]
Single–channel direct communication between NCK and PLC–SPL. Signals can be
written by the PLC and read by the NCK.
System variable $A_PLCSIOUT[1..32]
Single–channel direct communication between NCK and PLC–SPL. Signals can be
read by the PLC and read and written by the NCK.
System variable $AC_SAFE_SYNA_MEM
Variable $AC_SAFE_SYNA_MEM contains the number of free synchronizing ac-
tion elements Safety Integrated. The number before and after SAFE.SPF has run
is read in order to determine the value of the required elements. The difference
between the two values is then the number that (with a safety margin) must be en-
tered into machine data $MC_MM_NUM_SAFE_SYNC_ELEMENTS.
Note
Write access operations to all named system variables are only possible from the
program saved in program file /_N_CST_DIR/_N_SAFE_SPF reserved for the
SPL. Access operations from other programs are flagged as an error with Alarm
17070.
8-388
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
DB18.DBD46, DBD50
DB18.DBX70.0 ... DBX77.7
DB18.DBD70, DBD74
© Siemens AG 2008 All Rights Reserved
05.08