Detailed description
2.12 Block descriptions
Basic logic functions: PLC basic program solution line (P3 sl)
158 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.12.7 FB 9: MtoN Control unit switchover
Description of Functions
This block allows switchover between several control units (HMI operator panel fronts and/or
MCP machine control panels), which are connected to one or more NCU control modules via
a bus system.
References:
/FB2/ Function Manual Extended Functions; Several Operator Panel Fronts on Several
NCUs, Distributed 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, Section "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 control unit switchover:
Tabulated overview of functions:
Basic function Significance
HMI queuing HMI wants to go online with an NCU
HMI coming HMI is connecting to an NCU
HMI going HMI is disconnecting from an NCU
Forced break HMI must break connection with an NCU
Operating focus changeover to
server mode
Change operating focus from one NCU to the other
Active/passive operating mode: Operator control and monitoring/monitoring only
MCP switchover As an option, MCP can be switched over with the HMI
Brief description of a few important functions
Active/passive operating mode:
An online HMI can operate in two different modes:
Active mode: Operator can control and monitor
Passive mode: Operator can monitor (HMI header only)
After switchover to an NCU, this initially requests active operating mode in the PLC of the
online NCU. If two HMI are connected online on one NCU simultaneously, one of the two is
always in active and the other in passive mode. The operator can request active mode on
the passive HMI at the press of a button.
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