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

19.2

Axis monitoring, protection zones (A3)

19.2.1

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 cleared.
edge change Then, motion can start in the same protection zone. As a result of the start of motion, the protection
0 → 1 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 exam‐ This allows protection zones to be released:
ple(s)
● If the current position is within a protection zone (alarm 2 present)
● If motion is to be started towards the protection zone limit
DB21, ...
DBX8.0 - DBX9.1 Activate machine-specific protection zone 1 ( ...10)
Edge evaluation: No
Signal state 1 or The pre-activated, machine-related protection zone 1 ( ...10) is activated by the PLC user program.
edge change
The protection zone is immediately activated.
0 → 1
Only protection zones that have been pre-activated in the part program can be activated.
Signal state 0 or The pre-activated, machine-related protection zone 1 ( ...10) is de-activated by the PLC user program.
edge change
The protection zone is immediately de-activated.
1 → 0
Only protection zones that have been activated via the PLC and have been pre-activated in the NC
part program can be de-activated.
Application exam‐ Before a sensor, for example, is moved into the working range, the relevant machine-related protec‐
ple(s) tion zone can be activated.
DB21, ...
DBX10.0 - DBX11.1 Activate channel-specific protection zone 1 ( ...10)
Edge evaluation: No
Signal state 1 or The preactivated, channel-specific protection zone 1 ( ...10) is activated by the PLC user program.
edge change
The protection zone is immediately activated.
0 → 1
Only protection zones that have been pre-activated in the part program can be activated.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Signal(s) updated: Cyclically
(alarm 1 or 2 present)
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Z1: NC/PLC interface signals
19.2 Axis monitoring, protection zones (A3)
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