4 Data Descriptions
11.03
4.4 System variable
© Siemens AG 2003 All Rights Reserved
4-264
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
System variables
Meaning
Value range
Data type Possible access for
Part
program
Synchr.
action
l
s
l
s
$A_MARKERSIPD[n] Image of PLC the markers
(from SW 4.4.18)
n = 1, 2
INT
x
x
$A_TIMERSI
[
n
]
Timer
n = 1, 2...16
stands for
No. of timer
REAL x x x x
$A_STATSID
Crosswise data comparison error
initiated if the value is not equal to 0
n = 0 Error not
triggered
n = 1 Error
triggered
INT x
x
$A_CMDSI
10-fold change timer timeout value for
long forced checking procedure pulses
and/or single-channel test stop logic.
Bit 0 = 0
10-fold time
active
BOOL x x x x
$A_LEVELSID
Crosswise data comparison stack level
display: Number of signals for which
NCK and PLC detect different signals
0...320 INT
x
x
Note:
l -> read, s -> write
An implicit preliminary stop is generated
Only permitted in the commissioning phase