Ncu Link; General Information - Siemens SINUMERIK 840D sl Function Manual

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.1 Brief description
● Either one HHU and one HT6, or two HHUs, or two HT6s can be connected to each bus
● The following cable lengths for MPI or OPI for standard use without repeater may not be
For more information about bus communication, see:
References:
/IAD/ 840D Commissioning Manual
2.1.4

NCU link

2.1.4.1

General information

Use
The NCU link, the link between several NCU units of an installation, is used in distributed
system configurations.
When there is a high demand for axes and channels, e.g. in case of revolving machines and
multi-spindle machines, the computing capacity, configuration options and memory areas
can reach their practical limits when only one NCU is used. Several NCUs interconnected
with an NCU link module provide a scalable solution which fully meets the requirements of
machine tools of this type. The NCU-Link module offers fast NCU-NCU communication
based on a synchronized 12 Mbaud PROFIBUS interface.
Note
NCU-Link is available in case of SINUMERIK 840D with link module and HMI Advanced.
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segment. No bus terminators must be inserted in the distributor boxes of an HHU or HT6.
If more than one HHU/HPU are connected to a bus segment, this can be done with an
intermediate repeater.
exceeded:
MPI (187.5 kbaud): Max. cable length 1000 m in total
OPI (1.5 Mbaud): Max. cable length 200 m in total
Note
Piggy-back connectors are not recommended for power connections.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions