Siemens SINUMERIK 840Di Function Manual page 1228

Detailed Description
2.6 Interface structure
Fig. 2-10
840Di topology
On the 840 Di, the machine control panel and handheld unit are connected to the PLC's MPI
(MultiPoint Interface) or Profibus. The PLC operating system copies the incoming signals
straight to the user interface (e.g., input image) at the cycle control point. As on the 840 D,
transfer to the VDI interface is performed by the user program or by standard blocks of the
basic program (e.g. FC19).
Bus addresses
On Ethernet components, MAC and IP addresses or logic names are determining factors in
respect of communication. The control system's system programs convert logic names into
MAC or IP addresses. On the PLC, the numeric component of the logic name is used for
communication. This numeric part is assigned to FB1 parameter MCPxBusAdr by the user.
2-34
Connection of the machine control panel on 840D
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0