Siemens SINUMERIK 840Di Function Manual page 111

2.4.5 Activation and deactivation of protection zones
General
The activation status of a protection zone is:
• Preactivated
• Preactivated with conditional stop
• Enabled
• Disabled
A protection zone is monitored for violation only when it is activated.
Activation
The activation of a protection zone can take place through:
• Part program instruction
• Automatically after the control powers up
• PLC user program
The preactivation, deactivation and activation of all protection zones always takes place
channel-specifically. A protection zone can also be active in multiple channels
simultaneously (application example: Double-slide single-spindle machine with one quill and
two machining slides. Machine-related protection zones are automatically activated in all
channels after the control powers up.
An activated protection zone is only taken into account after the successful referencing of all
participating geometry axes.
Preactivation
Only preactivated protection zones can be activated from the PLC user program.
Fig. 2-15
Axis Monitoring, Protection Zones (A3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
For activation through the PLC user program, the protection zone must be first
preactivated via a part program.
Example: Turning machine with preactivated protection zone for a sensor
Detailed Description
2.4 Protection zones
2-39