Siemens SINUMERIK 840D sl Function Manual page 975

Tabulated overview of functions:
Basic function
Operating focus changeover to serv‐
er mode
Active/passive operating mode:
MCP switchover
Note
The block must be called by the user program. The user must provide an instance DB with
any number for this purpose. The call is multi-instance-capable.
Brief description of a few important functions
Active/passive operating mode:
An online HMI can operate in two different modes:
Active mode:
Passive mode:
After switchover to an NCU, this initially requests active operating mode in the PLC of the
online NCU. If two control units are linked online simultaneously to an NCU, one of the two is
always in active mode 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.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
P3: Basic PLC program for SINUMERIK 840D sl
Description
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 HMI
Operator can control and monitor
Operator can monitor (HMI header only)
13.17 Block descriptions
975