Detailed Description
2.12 Block descriptions
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-139
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 Meaning
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.
MCP switchover
As an option, an MCP assigned to the HMI can be switched over at the same time. To
achieve this, the MCP address must be entered in the mstt_adress parameter of the
NETNAMES.INI configuration file on the HMI and MCPEnable must be set to true. The MCP
of the passive HMI is deactivated so that there is only ever one active MCP on an NCU at
one time.
Boot condition
To prevent the previously selected MCP being reactivated when the NCU is restarted, input
parameters MCP1BusAdr = 255 (address of 1st MCP) and MCP1STOP =TRUE (deactivate
1st MCP) must be set when FB1 is called in OB100.
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