Mpi Network Rules - Siemens SINUMERIK 810D Configuration Manual

11.02
12.95
2.4.2

MPI network rules

When installing a network, observe the following rules:
1. The bus line must be terminated at both ends. To do this, you switch on the
Note
S
S
2. At least 1 terminator must be supplied with 5V voltage.
Note
The connection on the NC control system can be used for this purpose.
3. Tap lines (feeding cable from the bus segment to the node) should be as
Note
Tap lines not used should be removed if possible.
4. Each MPI node must first be connected and then enabled.
5. One handheld operator unit and one handheld programming unit, or two
6. The following cable lengths for MPI may not be exceeded for the standard
E Siemens AG, 2002. All rights reserved
SINUMERIK 810D Manual Hardware Configuration (PHC) - - 11.02 Edition
terminating resistor in the MPI connector of the first and last user, and switch
off any other terminators.
Only two enabled terminators are permitted.
The HHU has integrated bus terminators.
For this, the MPI connector with inserted terminating resistor must be
connected to a powered device.
short as possible.
When disconnecting an MPI node, first deactivate the connection, then
remove the connector.
handheld units or handheld programming units can be connected for each
bus segment. No bus terminators must be inserted at the distributor boxes
of an HHU or HPU.
If more than one HHU/HPU are connected to a bus segment, this can be
done with an intermediate repeater.
case without repeater:
MPI (187.5 kbaud): Max. cable length in total 10m.
2 Installation Conditions
2.4 MPI network
J
2-39