Siemens SINUMERIK 840D sl Function Manual page 1302

Detailed description
2.5 Linking PLC CPUs to 840D
Data exchange with the control panel
Data exchange with the operator panel (HMI, OP) usually takes place via the internal
software-based C bus. Alternatively, external HMI or OP systems can also be connected on
Ethernet or the MPI bus. In the event of connection to the Ethernet bus, the integrated CP
provides the link to the PLC.
On the SINUMERIK 840D, data exchange with the machine control panel (MCP) and
handheld unit (HHU) is determined by the interface setup of the MCP/HHU. Possible
connection paths include: MPI, Profibus, Ethernet.
Programming devices should preferably be connected directly to the PLC on the Ethernet
bus via the internal CP or via the MPI (Multi-Point-Interface).
Figure 2-3 NCK-PLC coupling with SINUMERIK 840D (integrated PLC)
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Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0