03.06
2.3 MPI/OPI network rules
2-30
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D Configuring Manual NCU (PHD) – 03.06 Edition
Another possibility is two identical components, provided they have different
node addresses.
For setting the addresses (also see corresponding component section):
– HHU: Via DIP switch or display (see “Handheld unit” section),
– For HT 6, by adapting the address before commissioning (refer to Oper-
ating Components “Handheld Terminal HT 6”).
No bus terminating resistors may be inserted at the distributor boxes of an
HHU or HT 6 (refer to the note on item 2.)
If required, more than one HHU/HT 6 can be connected to a bus segment
using intermediate repeaters.
7. The following cable lengths for MPI or OPI for standard use without repeater
may not be exceeded:
MPI (187.5 kbaud): Max. total cable length is 1000 m
OPI (1.5 Mbaud): Max. total cable length is 200 m.
O
N
Terminating resistor
OFF ON
O
N
46
46
55
Fig. 2-3 MPI connector
Reference: Catalog IK PI – Industrial Communication for Automation
and Drives
2 Connection Conditions
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