Siemens SIMATIC S5-115F - Page 47

S5-115F Manual Installation Guidelines
Three mounting racks are available for expansion units. The type used depends on the con-
figuration. The three types of expansion racks are as follows:
• ER 701-1 for expansion unit ”1” (EU1)
• ER 701-2 for expansion unit ”2” (EU2)
• ER 701-3 for expansion unit ”3” (EU3)
Figure 3-5. Possible Configurations on Expansion Unit 1
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The IM 306 expansion unit interface module connects expansion units to a central controller in
centralized configurations ( 3.2.5).
A combination of the IM 304 and IM 314 interface modules connects expansion units to a central
controller in distributed configurations ( 3.2.6).
EWA 4NEB 811 6148-02 3-5