3 Safety-Related Functions 11.03
3.7 Safe software cams (SN)
© Siemens AG 2003 All Rights Reserved
3-122 SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
I/O number for the signal "SG selection bit 1": 6
I/O number for the signal "SG selection bit 0": 7
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.
Note
Machine data for the safely-reduced speed function are described in
Chapter 4.
Table 3-46 Supplying MD for cam positions
For 840D For 611 digital
MD No. Value MD No. Value
SN1- 36937 300
1337[0]
300 000
SN1+ 36936 600
1336[0]
600 000
Table 3-47 Supplying MD for speed limit values
For 840D For 611 digital
Limit value MD No. Value MD No. Value
1
36931[0]
1000
1331[0]
1000
2
36931[1]
0
1331[1]
0
3
36931[2]
2000
1331[2]
2000
4
36931[3]
4000
1331[3]
4000
Table 3-48 Assigning speed limit values to the zones
Speed limit value Area Remarks
SG selection
Bit 1 Bit 0
1 0 0 1 SG1 active
2 0 1 - Not used
3 1 0 2 SG3 active
4 1 1 3 SG4 active
Table 3-49 Supplying MD for SGEs/SGAs for 840D
Signal Assignment
SGE/SGA Name MD No. Value
SGA SN1+ 36988[0] 01 09 02 07
SGA SN1- 36989[0] 01 09 02 06
SGA Axis safely referenced 36987 01 09 02 05
SGA SBH/ SG active 36980 01 09 02 04
SGE SBH/SG de-selection 36970 01 09 01 02
SGE SBH de-selection 36971 01 09 01 03
SGE SG selection, bit 1 36972[1] 01 09 01 06
SGE SG selection, bit 0 36972[0] 01 09 01 07
Defining machine data
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