Configuring Hardware and Communication Connections STEP 7.pdf

Configuring Central Racks
2.4 Expanding the Central Rack with Expansion Racks
Configuring Expansion Racks in SIMATIC 300
For SIMATIC 300 stations, only "Rails" are available as central racks and as
expansion racks; this means you can position as many rails (max. 4) as there are
in the actual configuration.
Expansion racks are linked in STEP 7 by inserting the appropriate interface module
in slot 3 of every rack.
• To expand the configuration by one rack:
racks 0 and 1: IM 365
• To expand the configuration by up to three racks:
rack 0: IM 360; racks 1 to 3: IM 361
Configuring Expansion Racks in SIMATIC 400
In SIMATIC 400, the possibilities for expansion are more complex owing to the
different racks and interface modules.
All expansion racks that are connected to an interface of the send IM on the central
rack form a cascade.
In the following figure, three expansion racks are connected to each interface of the
send IM.
Configuring Hardware and Communication Connections with STEP 7
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