Siemens Sinumerik 840D sl Function Manual page 191

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A STOP D/E is triggered for an SPL--CDC error. SGE/SGA are set into the safe
state if an error is detected by the communication CDC.
Note
As a result of the two--channel structure of Safety Integrated, the machine
manufacturer must supply the SGE and SGA in both the NCK monitoring channel
and the drive monitoring channel.
The actual signal state of the SGE/SGA is displayed using the "Service display"
menu. Information regarding Safety Integrated data with the associated axis
names and the axis number are displayed in the "Service SI" window.
For Safety Integrated, SGEs/SGAs are coupled via the PROFIsafe profile using
standard PROFIBUS and PROFINET buses based on standard network compo-
nents. See Chapter with 7.2 "Connecting I/O via PROFIsafe". Internal SGE/SGA
signals are accessed via the SPL (see Chapter 7.5).
For instance, the following can be requested or signaled in each monitoring
channel and for each/spindle with safety technology using SGE/SGA signals:
S Safety functions can be selected and deselected
S Limit values can be selected and changed--over
S States relating to safety operation can be fed back
Features
S SGE and SGA signals are processed through two channels
S Processed in the NCK monitoring channel
S Processed in the drive monitoring channel
S Safety functions are selected/deselected independent of the NC mode
S Differences in the active SGE/SGA in the monitoring channels are detected in
the crosswise data/result comparison
The access to SGE/SGA signals is described in Chapter 7.2 "Connecting I/O via
PROFIsafe", Chapter 7.4 "Safety--related CPU--CPU communication" and Chapter
7.5 "Safe programmable logic (SPL)".
Warning
!
The state of a deleted SGE/SGA (logical "0") that can be achieved both by the
user as well as also using fault responses of the "SINUMERIK Safety Integrated"
system, are defined as so--called "fail--safe state" of an SGE/SGA. This is the
reason that the system is only suitable for applications where this state
corresponds to the fail--safe state of the process controlled by "SINUMERIK
Safety Integrated".
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Connecting Sensors/Actuators
7.1 Safety- -relevant input/output signals
7-191