Siemens SINUMERIK 840Di Function Manual page 975

Activation
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.
Handheld unit
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.
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 FB 1 call.
Example of stopping transfer from the first machine control panel:
SET;
S
Setting parameters MCP1Stop, MCP2Stop, BHGStop also results in a suppression of alarms
40260 to 40262.
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
2. After checkback in DB10 byte 104 (relevant bits 0, 1, 2 set to 0). Change in the bus
3. In this PLC cycle, communication with the new component can now be activated again by
4. Communication with the new component is taking place when the checkback in DB10
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
gp_par.MCP1Stop;
MCP2Stop or BHGStop = 1.
address or GD parameter set of this unit to that of the new component.
means of parameter MCP1Stop or MCP2Stop or BHGStop = 0.
byte 104 (relevant bits 0, 1, 2 is set to 1).
2.7 Structure and functions of the basic program
Detailed description
2-63