Siemens SIMATIC S5-115U, User Manual

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Installation Guidelines S5-115U Manual
3.2.6 Distributed Configuration
A central controller connected to expansion units installed over a maximum distance of 3000 m
(9800 ft.) makes up a distributed configuration. The interface module used determines the
distance and the number of EUs that can be connected.
Distributed configurations using the following are not described here:
•
AS 301/AS 310
• AS 302/AS 311
• IM 307/IM 317
• IM 308/IM 318.
You can order these interface modules with a separate description.
Please note the following points concerning distributed configuration versions:
• Each ER 701-2 or ER 701-3 expansion rack requires a PS 951 power supply module and an
IM 306 interface module for addressing input/output modules (Exception: ET 100/ET 200).
• If the expansion units have their own power supply, please note the following:
- When switching on:
Switch on the power supplies of the expansion units first and only then the power supply of
the central controller.
- If you switch on the power supplies of the central controllers and the expansion units at the
same time, you must program a restart delay.
• See Section 3.5 (Shielding)!
• If you use digital input modules on the ER 701-2 or ER 701-3, it is recommended that you use
modules with revision level "2" (or higher).
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EWA 4NEB 811 6130-02b