Siemens SINUMERIK 840D sl Function Manual page 118

Detailed description
2.2 Protection zones
Preactivation
Only preactivated protection zones can be activated from the PLC user program.
Figure 2-13
Deactivation
A protection zone can be deactivated from a part program. Additionally an active,
preactivated protection zone can be set again in the preactivated (= ineffective) state through
the PLC user program.
RESET response
The activation status of a protection zone is retained even after NC-RESET and program
end.
Memory requirements
The memory requirement of the persistent memory is determined with following machine
data :
MD18190 $MN_MM_NUM_PROTECT_AREA_NCK (Number of available machine-defined
protection zones)
MD28200 $MC_MM_NUM_PROTECT_AREA_CHAN (Number of available channel-defined
protection zones)
The memory requirement in the dynamic part with regard to the protection zones is
established with following machine data :
MD28210 $MC_MM_NUM_PROTECT_AREA_ACTIVE (Maximum number of protection
zones that can be activated simultaneously in the channel)
MD28212 $MC_MM_NUM_PROTECT_AREA_CONTUR (Maximum number of definable
contour elements per protection zone)
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Example: Turning machine with preactivated protection zone for a sensor.
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0