11.03
3 Safety-Related Functions
3.9 Safety-related input/output signals (SGE/SGA)
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-129
Process
User
System
Machine
NCK
HW
I/O
I/O images
Processing
SGE
SGA
NCK
monitoring channel
SBH/SG
SE
SN
per axis/spindle
I1
I_Fig1
SGE ...
Multiple
distribution
...
I2
I_Fig2
SGE ...
In
...
I_Fign
...
SGE ...
O1
O_Fig1
SGA ...
Multiple
assignment
...
O2
O_Fig2
SGA ...
On
...
O_Fign
...
SGA...
I1
I_Fig1
SGE ...
PLC
user
program
...
I2
I_Fig2
SGE ...
In
...
I_Fign
...
SGE ...
O1
O_Fig1
SGA ...
...
O2
O_Fig2
SGA ...
On
...
O_Fign
SGA...
SBH/SG
SE
SN
per axis/spindle
PLC
HW
I/O
I/O images
Processing
SGE
SGA
Drive monitoring channel
PLC
user
program
Monitoring
comparators
Result and data
cross-check
SGESGA01.DS4
Monitoring
comparators
Fig. 3-28
Two-channel processing of I/O signals
The data and results in the two mutually independent monitoring channels are
subject to a crosswise data comparison. If any discrepancy is found, STOP F is
activated.
Note
Owing to the two-channel structure of Safety Integrated, the machine
manufacturer must
supply
the
SGEs
and
SGAs
in both the
NCK monitoring
channel
and the
drive monitoring channel
.
The actual signal status of the SGEs/SGAs is selected via the menu "Service
display". The "Service SI" window displays information about Safety
Integrated data together with the associated axis name and axis number.
For a two-channel control structure, only a single-channel signal feedback via
the PLC is needed.
In contrast, when a single-channel control structure is used, a redundant, i.e. a
two-channel feedback structure is required.
The following SGEs and SGAs are provided for each axis/spindle in each of the
two monitoring channels:
Basic principle of safe
signal processing
What SGEs/SGAs are
there?