Z2: NC/PLC interface signals
18.2 Distributed systems (B3)
Extended Functions
856 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Second HMI/PLC online interface
This interface utilizes a group signal for both bus types. No distinction is made between OPI
and MPI.
DB10 DBX108.1 E_MMC2Ready
FALSE no control unit online to OPI or MPI
TRUE Control unit online to OPI or MPI
The sign-of-life monitor is switched on by the PLC as soon as a control unit has gone online
to its interface and switched off again when it goes offline.
Sign-of-life monitoring will be enabled:
as soon as control unit or HMI logs on online to its HMI/PLC interface with
S_ACT/CONNECT.
Sign-of-life monitoring will be disabled:
as soon as control unit goes offline.
1. HMI wants to switchover and log off from PLC with OFFL_REQ_OP/OK
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
HMI acknowledges to PLC with OFFL_CONF_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.
18.2.3 Signals from NC (DB10)
DB10
DBX107.6
NCU link active
Edge evaluation: Signal(s) updated:
Signal state 1 or edge
change 0 → 1
NCU link communication is active.
Signal state 0 or edge
change 1 → 0
No NCU link communication is active.
Signal irrelevant for ... System with an NCU.
References Device Manual, NCU 7x0.3 PN
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