Siemens SINUMERIK 840D sl Function Manual page 516

Data descriptions
9.7 System variable
$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
$A_TIMERSI[1] = 0.0 $A_TIMERSI[1] = -1.0
$A_MARKERSI[2] = 1
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: Error in I/O signals, markers or dynamic data of the F_SENDDP-/F_RECVDP
Bit 26=1:
Bit 27 = 1:
Bit 28 = 1:
Bit 29 = 1:
Bit 30 = 1:
Programming example:
; for a crosswise data comparison error, set ext. output
N1060 IDS = 06 WHENEVER $A_STATSID <> 0 DO $A_OUTSE[1] = 1
These system variables can only be read by the user program.
System variable $A_CMDSI[1]
This system variable can be used to increase the time up to 10 s monitoring the signal changes
in the crosswise data comparison between NCK and PLC.
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communication.
PROFIsafe communication error occurred.
Error in CDC static data.
Crosswise data comparison error "SPL protection status" (status $MN_PRE‐
VENT_SYNACT_LOCK not equal to DB18.DBX36.0 (SPLReady)).
Time error in the communications between NCK and PLC (in 5 s, all ext. NCK-
SPL outputs are set to zero, the PLC goes to stop).
PLC signals a stop to the NCK.
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated