Siemens SINUMERIK 840D sl Function Manual page 204

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.15 Examples
OFFL_CONF_OP/PLC_LOCKED
Online PLC has received the offline request. The operator panel switchover is disabled in the
HMI-PLC interface. The operator panel cannot link up with another NCU and must remain
online.
On receipt of the positive acknowledgement OFFL_CONF_OP/OK, the operator panel sends
its online request to the target PLC of the relevant NCU by transmitting its
identification
Client identification
(ONL_REQUEST DB19, DBW100)
The target PLC sends the operator panel a positive or negative acknowledgement:
Pos. acknowledgement: Target PLC returns the client identification to the operator panel.
(ONL_CONFIRM, DB19, DBW102). Operator panel occupies the online-request interface
with its parameters (client identification, MMC type, MCP address). Operator panel can go
online once it has received the online permission from the target PLC.
Neg. acknowledgement: Target PLC does not return the client identification to the operator
panel. (ONL_CONFIRM, DB19, DBW102 not identical to client identification of requesting
operator panel). Operator panel cannot go online.
Example:
Another operator panel is currently switching over to the same NCU. This switchover
operation must not be interrupted. The operator panel remains online to the online NCU.
Once the operator panel has received a positive acknowledgement from the PLC, it may
need to suppress another online operator panel. The operator panel then receives
positive/negative online permission from the PLC.
Positive:
ONL_PERM/OK
On receipt of positive online permission (DB19, DBB 108, 109), the operator panel can go
online. An HMI-PLC interface is allocated to the operator panel at the same time as online
permission. (1 or 2, details can be found in the interface description in Section "Signal
descriptions").
Negative:
ONL_PERM/MMC_LOCKED
The requesting operator panel cannot go online. Two operator panels on which
uninterruptible processes are in progress are connected online to this NCU. The PLC cannot
suppress either of the two operator panels.
ONL_PERM/PLC_LOCKED
The requesting operator panel cannot go online. The operator panel switchover is disabled in
the HMI-PLC interface.
ONL_PERM/PRIO_H
The requesting operator panel cannot go online. Two operator panels that are both higher
priority than the requesting operator panel are connected online to the NCU. The PLC
cannot suppress either of the two operator panels.
204
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: Unique HMI identifier comprising bus type and bus address.
client
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions