Siemens SINUMERIK 840D sl Function Manual page 1054

Detailed description
2.7 Structure and functions of the basic program
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
As described in Section Control signals, all parameters must be programmed according to
data type.
Switching off flashing MCP:
With MCP firmware V5.01.02 and higher, flashing can be suppressed in offline mode. No
communication takes place in offline mode (e.g., if the MCP connection fails). Via the status
bits 24 or 25 in the MCP1StatSend, MCP2StatSend a value can be specified in the output
data when the communication is active.
The acknowledgement that the value as been imported, is returned in the same bits in the
MCP1StatRec, MCP2StatRec. Following a successful checkback signal, the status bits in
send status must be reset.
Example about realization is present on the toolbox.
Temperature monitoring of the MCP:
With MCP firmware V5.01.02 and higher, an increased temperature is signaled back via bit
28 = 1 in MCP1StatRec, MCP2StatRec.
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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).
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0