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2.4 MPI network
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E Siemens AG, 2002. All rights reserved
SINUMERIK 810D Manual Hardware Configuration (PHC) -- 11.02 Edition
2.4.2 MPI network rules
When installing a network, observe the following rules:
1. The bus line must be terminated at both ends.Todothis,youswitchonthe
terminating resistor in the MPI connector of the first and last user, and switch
off any other terminators.
Note
S Only two enabled terminators are permitted.
S The HHU has integrated bus terminators.
2. At least 1 terminator must be supplied with 5V voltage.
For this, the MPI connector with inserted terminating resistor must be
connected to a powered device.
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
short as possible.
Note
Tap lines not used should be removed if possible.
4. Each MPI node must first be connected and then enabled.
When disconnecting an MPI node, first deactivate the connection, then
remove the connector.
5. One handheld operator unit and one handheld programming unit, or two
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.
6. The following cable lengths for MPI may not be exceeded for the standard
case without repeater:
MPI (187.5 kbaud): Max. c able length in total 10m.
J
2In
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