Signals From Nc (Db10); Signals From Axis/Spindle (Db31 - Siemens SINUMERIK 840D sl Function Manual

Sign-of-life monitoring will be disabled:
as soon as control unit goes offline.
1. HMI wants to switch over and log off from PLC with
2. PLC acknowledges to HMI with OFFL_CONF_OP/OK
3. Control unit or HMI will be displaced by PLC with OFFL_REQ_PLC/OK
In both instances the PLC detects that a control unit is going offline and waits for the TRUE-
FALSE edge of its HMI sign-of-life signal.
The PLC then ceases to monitor the sign-of-life signal.
19.2.3

Signals from NC (DB10)

DB10
DBX107.6
Edge evaluation:
Signal state 1 or edge
change 0 → 1
Signal state 0 or edge
change 1 → 0
Signal irrelevant for ...
References
19.2.4

Signals from axis/spindle (DB31, ...)

DB31, ...
DBX60.1
Edge evaluation:
Signal state 1 or edge
change 0 → 1
Signal state 0 or edge
change 1 → 0
Signal irrelevant for ...
Additional references
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
19.2 Several Operator Panels on Several NCUs, Distributed Systems
OFFL_REQ_OP/OK
HMI acknowledges to PLC with OFFL_CONF_PLC/OK
NCU link active
Signal(s) updated:
NCU link communication is active.
No NCU link communication is active.
Systems without NCU link modules.
/PHD/ NCU Configuration Manual
NCU link axis active
Signal(s) updated:
Axis is active as NCU link axis.
Axis is used as a local axis.
Systems without NCU link modules.
/PHD/ NCU Configuration Manual
NC/PLC interface signals (Z2)
1021