Siemens SINUMERIK 840D Description Of Functions page 122

3 Safety-Related Functions
3.7 Safe software cams (SN)
I/O number for the signal "SG selection bit 1":
I/O number for the signal "SG selection bit 0":
If the axis is positioned exactly at the parameterized cam position, the cam
signals may have different states owing to variations in the actual values
between the two monitoring channels. If the SGAs "SNx" were directly
connected to the SGEs "SG selection", a crosswise data comparison would
signal an error. When cam synchronization is activated, the cam signals are
output with the same signal states in both channels when in the steady-state
condition.
Defining machine data Table 3-46
Table 3-47
Table 3-48
Table 3-49
3-122
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Note
Machine data for the safely-reduced speed function are described in
Chapter 4.
Supplying MD for cam positions
For 840D
MD No.
SN1- 36937
SN1+ 36936
Supplying MD for speed limit values
For 840D
Limit value MD No.
1
36931[0]
2
36931[1]
3
36931[2]
4
36931[3]
Assigning speed limit values to the zones
Speed limit value
SG selection
Bit 1 Bit 0
1 0 0
2 0 1
3 1 0
4 1 1
Supplying MD for SGEs/SGAs for 840D
Signal
SGE/SGA Name
SGA SN1+
SGA SN1-
SGA Axis safely referenced
SGA SBH/ SG active
SGE SBH/SG de-selection
SGE SBH de-selection
SGE SG selection, bit 1
SGE SG selection, bit 0
For 611 digital
Value MD No.
300
1337[0]
600 1336[0]
For 611 digital
Value MD No.
1000
1331[0]
0
1331[1]
2000
1331[2]
4000
1331[3]
Area Remarks
1 SG1 active
- Not used
2 SG3 active
3 SG4 active
Assignment
MD No.
36988[0]
36989[0]
36987
36980
36970
36971
36972[1]
36972[0]
© Siemens AG 2003 All Rights Reserved
11.03
6
7
Value
300 000
600 000
Value
1000
0
2000
4000
Value
01 09 02 07
01 09 02 06
01 09 02 05
01 09 02 04
01 09 01 02
01 09 01 03
01 09 01 06
01 09 01 07