Axis Monitoring, Protection Zones (A3); Signals To Channel (Db21 - Siemens SINUMERIK 840D sl Function Manual

Detailed Description

2.2 Axis monitoring, protection zones (A3)

2.2 Axis monitoring, protection zones (A3)
2.2.1

Signals to channel (DB21, ...)

DB21, ...
DBX1.1 Enable protection zones
Edge evaluation: yes
Signal state 1 or When a positive edge of this signal appears, a protection zone is enabled and the active alarm
edge change cleared. Then, motion can start in the same protection zone. As a result of the start of motion, the
0 → 1 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 No effect
edge change
1 → 0
Application This allows protection zones to be released:
example(s)
•
•
DB21, ...
DBX8.0 - DBX9.1 Activate machinespecific protection zone 1 ( ...10)
Edge evaluation: no
Signal state 1 or The pre-activated, machinerelated protection zone 1 ( ...10) is activated by the PLC user program.
edge change
The protection zone is immediately active.
0 → 1
Only protection zones that have been pre-activated in the part program can be activated.
Signal state 0 or The pre-activated, machinerelated protection zone 1 ( ...10) is de-activated by the PLC user
edge change program.
1 → 0
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 Before a sensor, for example, is moved into the working range, the relevant machinerelated
example(s) protection zone can be activated.
64
Signal(s) updated: cyclic
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)
Signal(s) updated: cyclic
Basic logic functions: NC/PLC interface signals (Z1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0