Detailed description
2.6 Interface structure
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-39
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2.6.3 PLC/MCP/HHU interface
General
On the SINUMERIK 840D/810D, the machine control panel (MCP) is connected on the same
bus that connects the OP with the NC. The advantage of this is that only one bus cable is
required to connect the operator unit. The handheld unit (HHU) can be connected to the MPI
of the PLC or to the operator panel interface (OPI) (840D only). However, since the OP bus
on the 840D supports higher baud rates, two different types of bus topology are provided.
840D topology
On the 840D, the machine control panel is connected to the OPI bus segment (transmission
rate 1.5 Mbps) as an active global data node. Where the connection of further keys and
displays is required for customized operator panels, an additional keyboard (machine control
panel without operating unit) can be used. 64 pushbuttons, switches, etc. and 64 display
elements can be connected via ribbon cable.
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