6ES5308-3UB11
Siemens Simatic S5 IM308 Interface Module

The Siemens 6ES5 308-3UB11 is an IM 308 interface module used for connecting I/O modules in the following expansion units (EUs) to a central controller (CC) in a distributed configuration:

• ER 701-2
• ER 701-3
• EG 183U
• EG 185U

6ES5308-3UB11 Design

The IM 308 interface is plugged into the central controller and the IM 318-3 interface module into the the expansion unit or the IM 318-8 interface module into the ET 100U electrical terminator.

Two lines, each containing up to 32 expansion units (with IM-318-3) or electric terminators (with IM 318-8) in any order can be connected to one IM 308 interface module. A total of 63 expansion units and ET 100U electronic terminators can operate via one IM 308 interface module. Digital and analog I/Os, intelligent I/O modules and communications processors with linear addressing can be used in the expansion units.

The central controller and distributed expansion units (ER 701-2 and ER 701-3 subracks) can be expanded with up to three additional expansion units in centralised configuration.

A memory submodule with the address list for the IM 308 interface module is only required for connecting ET 100U electronic terminators.

In the S5-115U programmable controller up to four areas of 256 bytes can be addressed with an IM 308 interface module. The central controller and the expansion units or electronic terminators are isolated from one another.