Siemens SINUMERIK 840D sl Function Manual page 173

Crosswise data comparison is implemented between the monitoring channels that operate
independently of one another. If there is inequality, then a STOP F is initiated (CDC between
the drive and NCK).
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 components. Internal SGE/
SGA signals are accessed via the SPL (see Chapter "Safe programmable logic (Page 256)").
For instance, the following can be requested or signaled in each monitoring channel and for
each/spindle with safety technology using SGE/SGA signals:
● Safety functions can be selected and deselected
● Limit values can be selected and changed-over
● States relating to safety operation can be fed back
Functional features
● SGE and SGA signals are processed through two channels
● Processed in the NCK monitoring channel
● Processed in the drive monitoring channel
● Safety functions are selected/deselected independent of the NC mode
● Differences in the active SGE/SGA in the monitoring channels are detected in the crosswise
data/result comparison
Access to SGE/SGA signals is explained in Chapter "Connecting I/O via PROFIsafe
(Page 184)", Chapter "Safety-related CPU-CPU communication (F_DP communication)
(Page 215)" and in Chapter "Safe programmable logic (Page 256)".
Failsafe state
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
failsafe state of an SGE/SGA. This is the reason that the system is only suitable for
applications where this state corresponds to the failsafe state of the process controlled by
"SINUMERIK Safety Integrated".
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
WARNING
Connecting sensors and actuators
8.1 Safety-related input/output signals
173