Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0 2-63
MPI switchover, OPI address
An existing connection with an MCP (Machine Control Panel) or HHU (HandHeld Unit) can
be aborted. Another MCP or HHU component already connected to the bus (with another
MPI or OPI address) can then be activated. Proceed as follows to switch addresses:
1. Stop communication with component to be decoupled via parameter MCP1Stop or
MCP2Stop or BHGStop = 1.
2. After checkback in DB10 byte 104 (relevant bits 0, 1, 2 set to 0). Change in the bus
address or GD parameter set of this unit to that of the new component.
3. In this PLC cycle, communication with the new component can now be activated again by
means of parameter MCP1Stop or MCP2Stop or BHGStop = 0.
4. Communication with the new component is taking place when the checkback in DB10
byte 104 (relevant bits 0, 1, 2 is set to 1).2-63
SINUMERIK
840D sl/840D/840Di/810D
Basic Machine
Function Manual
The communications system integrated in the NC permits a maximum of 2 machine control
panels and one handheld unit to exchange data with the 810D and the 840D. An SDB 210 is
not required to transfer the signals of these components. The information given below is
based on the assumption that no SDB 210 has been installed for the components
Each component is activated either via the number of machine control panels (parameter
MCPNum) or, in the case of the handheld unit, parameter BHG := 2 (BHG := 1 corresponds
to a link via the MPI interface in conjunction with an SDB 210). Whether a component is to
be linked to the OPI or the MPI is determined by parameters MCPMPI and BHGMPI.
The handheld unit addresses the MPI or OPI by means of a GD parameter set. These
parameter values must be assigned according to the handheld unit settings. However, the
parameter names on the handheld unit are the reverse of the parameter names in the basic
program. All Send type parameters on the handheld unit must be defined as Rec type (and
Rec in Send type) in the basic program.