Siemens SINUMERIK 840D Description Of Functions page 133

11.03
3.9 Safety-related input/output signals (SGE/SGA)
Processing NCK-SGEs Axis-specific/spindle-specific machine data is used to define which input is to
for 840D (multiple be used for which function and which axis/spindle. Under the condition that
distribution) certain axes/spindles belong to the same safety group, it is possible to
implement multiple distribution (1 input is assigned, for example, to 3 axes with
the same function). In addition, when an NCK input is selected via MD, it is also
possible to define whether the inverted signal is to be processed.
Fig. 3-30
Example It must be possible to change over between the "safe software limit switches"
1 and 2 for axes 1, 2 and 3 as a group via an NCK input "x".
The machine data must be parameterized as follows:
Axis 1: MD 36973: $MA_SAFE_POS_SELECT_INPUT = input x
Axis 2: MD 36973: $MA_SAFE_POS_SELECT_INPUT = input x
Axis 3: MD 36973: $MA_SAFE_POS_SELECT_INPUT = input x
(input x = ss mm xx nn, refer to Chapter 4, "Machine data for SINUMERIK
840D")
Processing NCK SGAs Axis-specific/spindle-specific machine data is used to define which SGA from
for 840D (multiple which axis/spindle must be assigned to which NCK output. It is possible to
assignment implement a multiple assignment (SGAs from several axes, for example, are
assigned to 1 output) provided that certain axes/spindles belong to the same
safety group. The SGAs are then ANDed and the result output at the NCK
output. In addition, when an NCK output is selected via an MD, it is also
possible to define whether the signal is to be output in an inverted form before it
is ANDed.
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
The machine manufacturer is responsible for ensuring that digital NCK
outputs are not assigned twice (resulting in conflict) by configuring them
correctly.
For SINUMERIK 840D, the number of NCK SGEs/SGAs is only limited by the
maximum available number of NCK I/O hardware devices that can be
inserted.
Multiple
NCK
HW
distribution
I1
I2
Ix
...
...
. . . ...
...
...
In
Multiple distribution of NCK inputs
3 Safety-Related Functions
NCK
Monitoring
SGE/SGA
Inversion
comparators
interface
...
...
yes/no
SGE ...
... ...
... ...
yes/no
SGE ...
...
...
... ...
yes/no
SGE ...
...
... ...
for axis 1
for axis 2
for axis 3
SGESGA05.DSF
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