M:n Communication Links - Siemens SINUMERIK 840D Operator's Manual

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Operator Components/Sequence of Operations
2.6 General sequence of operation

2.6.8 m:n Communication links

General
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The term m:n link is used to indicate a configuration in which
m HMI Advanced units and n NCU/PLC units are interconnected. This
does not, however, mean that all possible links are actually active.
In this case, an HMI Advanced is linked to only one NC at any given
point in time (cf. 1:1 link) and communicates only with this unit. With
an m:n link, the link can also be switched over to another NC. Using
the channel switchover key and channel menu, you can switch the
MMC over to another link.
The channel menu function is an option and must be configured in the
NETNAMES.INI file.
You can change to the channel menu in all operating areas by
activating the channel switchover key. The only change is to the
horizontal and vertical softkeys.
Use the horizontal softkeys to select a channel group (max. 24),
8 links to channels on different NCUs can be set up in each channel
group.
All current communication links and associated symbol names are
listed in display "Channel menu".
Important
Only two links may be active simultaneously on one NCU.
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
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03.04
Ó Siemens AG, 2004. All rights reserved