Siemens Sinumerik 840D sl Function Manual page 541

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System variables $A_MARKERSI[1...192]
Up to 192 status bits of the SPL can be flagged using these system variables. The
markers are read and written directly into the NCK--SPL.
Programming example:
N1030 IDS = 03 DO $A_MARKERSI[2] = $A_OUTSI[1] AND $A_INSE[2]
N1040 IDS = 04 DO $A_OUTSE[1] = $A_MARKERSI[2]
System variable $A_MARKERSID[1...6]
The SPL status bits can be addressed in a word--serial fashion using these system
variables.
$A_MARKERSID[1] corresponds to $A_MARKERSI[1...32]
$A_MARKERSID[2] corresponds to $A_MARKERSI[33...64]
$A_MARKERSID[3] corresponds to $A_MARKERSI[65...96]
$A_MARKERSID[4] corresponds to $A_MARKERSI[97...128]
$A_MARKERSID[5] corresponds to $A_MARKERSI[129...160]
$A_MARKERSID[6] corresponds to $A_MARKERSI[161...192]
System variables $A_TIMERSI[1...16]
Up to sixteen timers can be programmed using these system variables.
Programming example:
; set marker once after two seconds, reset the timer value and stop
the timer.
N1050 IDS = 05 WHENEVER $A_TIMERSI[1] > 2.0 DO
System variable $A_STATSID
This system variable can be using in the NCK--SPL to evaluate whether, in the
crosswise data comparison between NCK and PLC, an error was detected in the
two--channel control/processing of the control and status signals. This gives the
user the opportunity to respond to this error with specific synchronous actions.
Bit 0... 5=1:
Bit 26=1:
Bit 27=1:
Bit 28=1:
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
$A_TIMERSI[1] = 0.0 $A_TIMERSI[1] = -1.0
$A_MARKERSI[2] = 1
Error in I/O signals, markers or dynamic data of the
F_SENDDP--/F_RECVDP communication.
PROFIsafe communication error occurred.
Error in CDC static data.
Crosswise data comparison error "SPL protection status" (status
$MN_PREVENT_SYNACT_LOCK not equal to DB18.DBX36.0
(SPL READY)).
Data Description
8.7 System variables
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