Siemens SINUMERIK 840D sl Programming Manual page 250

Protection zones
3.2 Activating/deactivating protection zones (CPROT, NPROT)
Further information
Activation status (<state>)
● <state>=2
● <state>=1
● <state>=3
● <state>=0
Movement of protection zones for (pre)activating
The offset can take place in 1, 2, or 3 dimensions. The offset refers to:
● the machine zero in workpiece-specific protection zones.
● the tool carrier reference point F in tool-specific protection zones.
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A protection zone is generally activated in the part program with status = 2.
The status is always channel-specific even for machine-oriented protection zones.
If a PLC user program provides for a protection zone to be effectively set by a PLC user
program, the required preactivation is implemented with status = 1.
In the case of preactivation with conditional stop, the system never stops in front of a
preactivated protection zone which has been violated. The stop only occurs if the
protection zone has been activated. This facilitates uninterrupted processing if the
protection zones have only been activated in special cases. N.B. The system may move
into the protection zone as a result of the braking ramp if the protection zone is only
activated immediately prior to motion.
Preactivation with conditional stop is realized using status = 3.
The protection zones are deactivated and therefore disabled with Status = 0. No shift is
required
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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