Siemens SINUMERIK 840D Description Of Functions page 274

5 Commissioning
5.1 Commissioning SINUMERIK 840D
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Note
The function "safe software limit switch" (SE) is also called "safe limit position"
and the function "safe software cams" (SN) is also called "safe cams".
Note
If SI functions SH, SBH and SG have been enabled, then they become
operational after the control system has run-up (basic display on screen).
Cam and limit positions can be evaluated reliably for the SN and SE functions
once the axes have been "safely" referenced.
Caution
Protection of operating personnel must be the primary consideration when
configuring machine data for SINUMERIK Safety Integrated
reason that the parameterizable tolerances, limit values and delay times
should be determined and optimized during the commissioning phase
dependent on the machine design and arrangement.
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11.03