Detailed Description
2.2 Axis monitoring, protection zones (A3)
Basic logic functions: NC/PLC interface signals (Z1)
64 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.2 Axis monitoring, protection zones (A3)
2.2.1 Signals to channel (DB21, ...)
DB21, ...
DBX1.1
Enable protection zones
Edge evaluation: yes Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
When a positive edge of this signal appears, a protection zone is enabled and the active alarm
cleared. Then, motion can start in the same protection zone. As a result of the start of motion, the
protection zone is enabled, the IS "machine or channel-specific protection zone violated" is set, and
the axis starts to move.
The enabling signal is canceled if motion is started that does not lead into the enabled protection
zone.
Signal state 0 or
edge change
1 → 0
No effect
Application
example(s)
This allows protection zones to be released:
• if the current position is within a protection zone (alarm 2 present)
• if motion is to be started towards the protection zone limit
(alarm 1 or 2 present)
DB21, ...
DBX8.0 - DBX9.1
Activate machinespecific protection zone 1 ( ...10)
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
The pre-activated, machinerelated protection zone 1 ( ...10) is activated by the PLC user program.
The protection zone is immediately active.
Only protection zones that have been pre-activated in the part program can be activated.
Signal state 0 or
edge change
1 → 0
The pre-activated, machinerelated protection zone 1 ( ...10) is de-activated by the PLC user
program.
The protection zone is immediately deactivated.
Only protection zones that have been activated via the PLC and have been preactivated in the NC
part program can be deactivated.
Application
example(s)
Before a sensor, for example, is moved into the working range, the relevant machinerelated
protection zone can be activated.
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