Siemens SINUMERIK 840D sl Function Manual page 162

Connecting Sensors/Actuators
7.1 Safety-relevant input/output signals
Machine
HW
PROFI–
inputs/
BUS DP
output
s
Process
Fig. 7-1 NCK and drive monitoring channel
For the NCK monitoring channel, signals are input/output via the SPL - possibly
processed by the NCK (see Subsection 7.1.5 "Multiple distribution and multiple
interlocking") and emulated (mapped) in the NCK-SGE/SGA interface.
The signals from the drive monitoring channel are input/output via the SPL and
sent to the drive via the interface axis/spindle DB.
Internal SGEs/SGAs (interface to the various axial safety functions) are, e.g. se-
lecting and de-selecting safety functions, changing-over limit values, output of sta-
tus signals. They are defined for the particular Safety Integrated functions.
Sensors – e.g. switches, pushbuttons, protective door contacts, Emergency Stop
pushbuttons, light curtains, laser scanners are connected to the external SGEs
(interface to the process, i.e. to the machine). Actuators – e.g. load contactors,
valves, interlocking solenoids are connected to the external SGAs. The connection
is established through the PROFIsafe I/O, also see Section 7.2. Generally, a brake
is directly connected at the Motor Modules via terminals.
The external and internal SGEs/SGAs are freely interlocked (logically combined)
by the user using the "safe programmable logic" (SPL), also see Section 7.3.
Crosswise data comparison is implemented between the monitoring channels that
operate independently of one another. If there is inequality, then a STOP F is initi-
ated (crosswise data comparison between the drive and NCK). A STOP D/E is trig-
gered for an SPL crosswise data comparison.
7-162
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
NCK monitoring channel
external
SGEs/SGAs
NCK
processing
NCK
signal
process
ing
Crosswise result and
PROFIsafe
data comparison
driver:
PLC
signal
process
ing
PLC
processing
Drive monitoring channel
internal
SGEs/SGAs
signal
Interface
NCK
SGE/SGA
signals
Crosswise result and
data comparison
Drive
SGE/SGA
signals
signal
Interface
Axis/spindle DB
System
© Siemens AG, 2006. All rights reserved
03.06
Comparator
Data
Comparator
data