Functions - Siemens SINUMERIK 840D sl Function Manual

● Two MCPs and one HHU can be connected to the MPI or OPI on one NCU.
● The necessary configuration in the NC for the connection of MCPs/HHUs is defined using
● Addresses must be specified in the case of data exchange between PLCs via Profibus
● The maximum number of bus nodes is 32.
2.1.3.2

Functions

Switchover of link to another NCU with the softkey labeled "Connections"
A menu appears in which you can select the connections conn_1, ... conn_n (declared in
NETNAMES.INI) via softkeys.
The name (name=...) allocated to the connection in NETNAMES.INI is displayed on the
softkeys.
A connection to the new NCU is confirmed by pressing a softkey.
Switchover behavior on OP030
It is not possible to switch over to another bus node online. The connection contained in
NETNAMES.INI is permanently configured.
HMI Embedded switchover behavior
The "Connections" softkey is only displayed if more than one link is configured in
NETNAMES.INI. When changing to the new NCU, the existing connection to another NCU is
interrupted.
HMI applications must no longer need a connection to the previous NCU at the time of link
switchover (e.g. for active data backup via V,24 interface). Otherwise the control will issue a
message if the connection is required.
HMI behavior with respect to the NCU to which it is switching over is the same way as after a
restart, i.e. it is in the operating area which is defined as the start operating area.
HMI Advanced switchover behavior
The "Connections" softkey is only displayed if the "M:N" function is activated on the control.
The "M:N" function is activated in the "Commissioning/HMI/Operator panel" menu.
Connections are maintained during the switchover process, and the applications which are
using these connections also remain active. After the switchover, the HMI is in the same
operating area with respect to the new NCU as it was previously with respect to the other
NCU.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Several Operator Panels on Several NCUs, Distributed Systems (B3)
the basic PLC program (see Function Description, P3: Basic PLC Program).
DP or for global data (double addressing) with PLC-CPU 315 and higher.
The following applies: NC address = PLC address + 1.
2.1 Brief Description
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