Expansion Units (Eu) - Siemens SIMATIC S5-115F User Manual

Installation Guidelines
3.1.2

Expansion Units (EU)

If the slots of a central controller are not sufficient for the installation of a control system, one or
more expansion units can be connected to the central controller.
A distinction is made between centralized and distributed configurations:
• Centralized configuration
Up to three expansion units can be connected to one central controller (CC) or to one special
expansion unit (EU). These are without power supply. The cable must not exceed 2.5 m (8.2 ft.).
• Distributed configuration
Up to eight EUs can be connected to one CC. Each of the EUs has a power supply module. The
cable must not exceed 600 m/2000 ft.
This allows a maximum configuration of five groups of four racks each, one rack being the central
controller rack.
EU1
or
EU3
EU1
or
EU3
EU1
or
EU3
max 4 EU 2/3
CC
Distributed configuration
Figure 3-4. Maximum Configuration of an S5-115F Subunit
3-4
EU1 EU1
or or
U EU3
Centralized config.
EU1 EU1
or or
EU3 EU3
EU1
EU1
or
or
EU3
EU3
EU2 EU2
or or
EU3 EU3
max 4 EU 2/3
S5-115F Manual
EU1 EU1
or or
EU3 EU3
EU1 EU1
or or
EU3 EU3
EU1 EU1
or or
EU3 EU3
EU2 EU2
or or
EU3 EGU
EWA 4NEB 811 6148-02