3 Safety-Related Functions 11.03
3.7 Safe software cams (SN)
© Siemens AG 2003 All Rights Reserved
3-120 SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3.7.2 Application example for "safe software cams"
The axis speed must be monitored for violation of various speed limit values
based on position ranges 1, 2 and 3 of the axis, i.e. if the axis is in range 1, 2,
3, then its speed must be monitored for violation of speed limit value 1, 3, 4.
The position ranges are defined using cam signals SN1- and SN1+.
Machine
zero
2nd axis
1st axis
Position value
of SN1-
of SN1+
SN_01.DSF
1
0
1
0
Signal chart of SN1-
Signal chart of SN1+
SN1-
SN1+
Area
0
0
1 (SG1)
1
0
2 (SG3)
1
1
3 (SG4)
Fig. 3-22 Signal characteristics, positioning and ranges
Note
In this example, cam synchronization must be enabled using the following
machine data:
For 840D MD 36901, bit 7: $MA_SAFE_FUNCTION_ENABLE
For 611 digital MD 1301, bit 7: $MD_SAFE_FUNCTION_ENABLE
Applicable from: SW 4.2 for 840D/611 digital
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