Siemens SINUMERIK 840D sl Function Manual page 1144

Detailed description
2.12 Block descriptions
2.12.7 FB 9: MzuN Control unit switchover
Description of Functions
This block allows switchover between several control units (operator panels, MMC handheld
units and/or MCP machine control panels), which are connected to one or more NCU control
modules via a bus system.
References:
/FB2/ Function Manual, Expansion Functions; Several Control Panels on Multiple NCUs,
Decentralized Systems (B3)
The interface between the individual control units and the NCU (PLC) is the M : N Interface
in the data block DB 19; see
/FB2/ Function Manual Extended Functions, Chapter "Data lists, Signal description".
FB 9 uses the signals of these interfaces.
Apart from initialization, sign-of-life monitoring and error routines, the following basic
functions are also performed by the block for operating-unit switchover:
Tabulated overview of functions:
Basic function
MMC call waiting
MMC coming
MMC going
Forced break
Operating focus changeover to
server mode
Active/passive operating mode:
MCP switchover
160
Meaning
MMC wants to go online to an NCU
MMC is connecting to an NCU
MMC is disconnecting from an NCU
MMC must break connection to an NCU
Change operating focus from one NCU to the other
Operator control and monitoring/monitoring only
As an option, MCP can be switched over with the MMC
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0