Siemens SINUMERIK 840D sl Function Manual page 339

03.06
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]
Direct single-channel communications between the NCK and PLC-SPL. Signals
can be written by the PLC and read by the NCK.
System variable $A_PLCSIOUT[1..32]
Direct single-channel communications between the NCK and PLC-SPL. Signals
can be read by the PLC and read and written by the NCK.
General information about system variables $A_xxxP(D)
The system variables are updated in the same clock cycle as the crosswise data
comparison between the NCK and the PLC.
These system variables can only be accessed reading.
These system variables may only be used in the commissioning phase.
As soon as commissioning has been signaled as completed, access to these sys-
tem variables is blocked. If these program commands are processed, Alarm 17210
is output to indicate an error condition.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
DB18.DBD46, DBD50
DB18.DBX70.0 ... DBX77.7
DB18.DBD70, DBD74
Data Description
8.4 System variables
8-339