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Multi-Tier Expansion
5.2
If
it is not possible to have all of the modules located on one tier, then you can expand the con-
figuration up to four tiers. You may use a maximum of 8 bus units
matter how many bus units are mounted on a tier.
connect the tiers one to the other.
Install an interface module as you would install a bus unit. You must connect each interface module
to the last bus unit via the flat ribbon cable.
Use the IM 315 interface module
permanently connected via a 0.5-m (20-in.) cable.
Use the IM 316 interface modules for multi-tier configurations. Use the 712-8 connecting cable to
connect the IM 316 interface modules (Order No. 6ES5 712-8...).
The standard mounting rails must have a common reference potential if they are mounted in
different cabinets.
Figure 5-5. Interconnecting Tiers with Interface Modules (6ES5316-8MA12)
Safety Note
For reasons of EMC you must cover unused sub D locations on the IM 316 interface
module with an empty sub D connector (6 ES5-750-2AA21 ).
EWA 4NEB 8126210-02
Expansion of Basic System with External 110s
You need one interface module per tier to
for two-tier configurations. The IM 315 consists of two modules
for each subunit. It does not
5-5
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