System Variables For Sinumerik 840D Sl - Siemens SINUMERIK 840D sl Function Manual

Connecting Sensors/Actuators
7.3 Safe programmable logic (SPL)
Signal
Out3
FirstRun
Parameter FirstRun must be switched to the value TRUE via a retentive data
(memory bit, bit in the data block) at the first run-through after the control has
booted. The data can be preset, e.g. in OB 100. The parameter is reset to FALSE
when FB 10 is executed for the first time. Separate data must be used for parame-
ter FirstRun for each call with its own instance.
Note
The block must be called cyclically by the user program beginning from when the
PLC program is started. The user must provide an instance DB with any number
for this purpose. The call is multi-instance-capable.
7.3.8

System variables for SINUMERIK 840D sl

The following system variables can only be used in combination with SINUMERIK
Safety Integrated. They are used when programming the safe programmable logic
(SPL).
Also see Subsection 8.4.2 "Description of the system variables" for a detailed de-
scription of the system variables.
Table 7-7 Overview of system variables
System Meaning
variables
Actual position
$VA_IS[axis] Safe actual position for
Safety Integrated
$AA_IM[axis] Actual position of the
closed-loop control
$VA_IM[axis] Encoder actual value in
the machine coordinate
system
7-216
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Type Type
O BOOL Output, delayed by TimeValue3
I/O BOOL Activates the initial state
Range of
values
Comment
Data type Possible access for
Part
program
l s
DOUBLE x
DOUBLE x
DOUBLE x
© Siemens AG, 2006. All rights reserved
03.06
Synchr.
action
l s
x
x
x