Siemens SINUMERIK 840D sl Function Manual page 877

routine must copy the signals of the active MCP from the I/O area configured in HW Config to
DB77. This enables a number of MCPs on the PROFIBUS to be switched via signals. Set the
MCPxStop parameter to TRUE for the switchover phase from one MCP to another.
Control signals
Parameters MCP1Stop, MCP2Stop and BHGStop can be used to stop communication with
individual components (parameter setting = 1). This stop or activation of communication can
be applied in the current cycle. However, the change in value must be implemented through
the symbolic notation of the parameters and not by means of another FB1 call.
Example: Stopping the transfer from the 1st machine control panel:
SET;
S gp_par.MCP1Stop;
Setting parameters MCP1Stop, MCP2Stop, BHGStop also results in a suppression or deletion
of alarms 400260 to 400262.
Switchover of the bus address
If an existing communication connection to an operator component (MCP or HHU) is to be
cancelled and a new communication connection established to a different component (MCP
or HHU) with a different communication address, proceed as follows:
1. Stop the communication of the operator component to be disconnected: Parameter
MCP1Stop, MCP2Stop or BHGStop = 1
2. The communication is stopped when the following applies: DB10, DBX104.0, .1 or .2 == 0
3. Change the bus address:
–
–
4. Enable the communication (possible in the same PLC cycle as point 3): Parameter
MCP1Stop, MCP2Stop or BHGStop = 0
5. The communication with the new component is active when the following applies: : DB10,
DBX104.0, .1 or .2 == 1
Switching off the LED flashing of an Ethernet MCP
After a Power On, MCPs generally indicate the completion of the power-up and waiting for a
connection to be established by flashing LEDs. The flashing of the LEDs can be switched off
as described in the following. Presently, this behavior cannot be retentively stored on the MCP.
Requirement
MCP firmware as of V02.02.04
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
MCP: FB1 parameter MCP1BusAdr or MCP2BusAdr = <bus address of the new
operator component>
HHU (Ethernet variant): FB1 parameter BHGRecGDNo = <bus address of the new
operator component>
P3: Basic PLC program for SINUMERIK 840D sl
13.10 Structure and functions of the basic program
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