3
03/2006
3.1 MPI network rules for SINUMERIK 840D
3-21
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
3.1.1 Communication equipment
The components involved in MPI and BTSS communication are PLC, NCK,
COM and PCU/HMI. They allow communication between the active nodes.
Communication between passive nodes, e.g. GD circuit communication, is not
discussed here.
The aforementioned component perform the following tasks concerning MPI
and BTSS communication:
S PLC and NCK
PLC and NCK are both servers that provide communication links to client
components and execute jobs via these client components upon request.
The number of possible communication links from the server to the clients
and the number of parallel function jobs (Read variables, Write variables,
etc.) are limited.
S HMI
An HMI component is a client that requests communication links from one or
more servers and sends jobs to them.
S COM
The COM component is a router that allows communication between va-
rious component via different communication links (MPI, BTSS and Dual
Port RAM).
NCK
(server)
BTSS bus (1.5 MBaud)
6
Default bus addresses
X101
SINUMERIK 840D
MPI bus (187 5 kBaud)
13
3
2
X122
COM (router)
PLC (server)
1
Router
1
HMI (client)
Machine control panel
(passive GD circuit node)
HMI (client)
SIMATIC
programming device
PROFIBUS DP (12 MBaud)
0
DPR
Router
X102
Fig. 3-3 Default application for SINUMERIK 840D
3 Settin
s, MPI/BTSS
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