Siemens SINUMERIK 840D sl Function Manual page 214

Several Operator Panels on Several NCUs, Distributed Systems (B3)
Examples
MCP SWITCHOVER
A control unit consists of an operator panel and an MCP; these can both be switched over as
a unit.
If an MCP has been configured for the operator panel in configuring file NETNAMES.INI, it
will be activated and deactivated with the operator panel.
The operator panel of whichever MMC is currently in active operating mode is activated.
In other words, only one MCP is ever active at any time on an NCU.
The MCP is activated by the PLC:
● Operator panel changes to active operating mode. (signal MMCx_ACTIVE_CHANGED:
The MCP is deactivated by the PLC
● Operator panel changes to passive operating mode.
● Operator panel goes offline by means of switchover or suppression
● Server HMI disconnects operating focus from the current NCU and switches it over to
2.15.2.3 Defined logical functions/defines
Note
Please refer to Section "Defined logical functions/defines" for the legal values for bus type,
functions/status and additional information, plus permissible combinations of status and
additional information. The logical identifiers of functions are used in the following diagrams.
2.15.2.4 Graphical representation of function sequences
Overview
The diagrams below describe how an operator station is switched over (switchover from
NCU_1 to NCU_2).
The first five diagrams describe the switchover operation for an operator station and the next
three the switchover operation for a server.
If an operator panel (MMC) in the offline state wants to go online on an NCU (e.g. on power
up), the sequence OFFL_REQ_OP (...), or OFFL_CONF_OP(...) is not necessary.
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FALSE -> TRUE, x = 1,2 first or second HMI-PLC interface)
(signal MMCx_ACTIVE_CHANGED: TRUE -> FALSE, x = 1,2 first or second HMI-PLC
interface)
The HMI sign of life changes from TRUE to FALSE when an operator panel goes offline.
After the edge change, the PLC deactivates the allocated MCP.
another. The server transmits S_ACT/ DIS_FOCUS as the last signal on its own HMI-PLC
interface. The PLC then deactivates the corresponding MCP.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions