Mpi/Opi Network Rules - Siemens SINUMERIK 840DE User Manual

03.06
2.3

MPI/OPI network rules

Use The following devices can be interconnected across the MPI bus:
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The MPI interconnecting cables are available in different lengths.
Network
When installing a network, observe the following basic rules:
installations
1. The MPI connection can be routed from one user to the next by plugging the
2. The bus line must be terminated at both ends. To do this, enable the termi-
Note
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3. At least 1 terminal must be supplied with 5 V.
Note
The NCU must be located at the end of the connection.
4. Drop cables (feeder cable from bus segment to node) should be as short as
Note
Unused spurs must be removed.
5. Every MPI node must first be connected and then activated.
6. A maximum of two of the HHU and HT 6 components can be connected for
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D Configuring Manual NCU (PHD) – 03.06 Edition
NCU
PCU
HT 6
HHU
MSTT/MCP
MPI connector of the outgoing cable onto the MPI connector of the incoming
cable.
nating resistor in the MPI connector of the first and last node and disable the
remaining terminating resistors (see Fig. 2-3).
Only two inserted terminating resistors are permitted.
In the case of the HHU/HT 6, bus terminating resistors are permanently
integrated in the device.
This is done by connecting an MPI connector with the terminating resistor
connected to an energized device.
possible.
When disconnecting an MPI node, first deactivate the connection and then
remove the connector.
each bus segment.
2 Connection Conditions
2.3 MPI/OPI network rules
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