Product Overview
The SIEMENS 6ES5308-3UB11, known as the IM308B interface module, is a specialized communication processor designed for the SIMATIC S5 family of programmable logic controllers. This master interface module serves as a gateway, enabling S5-115U, S5-135U, and S5-155U systems to connect to PROFIBUS-DP and SINEC L2 fieldbus networks . As a component of the legacy SIMATIC S5 platform, the SIEMENS 6ES5308-3UB11 was instrumental in implementing distributed I/O architectures, allowing remote ET 200 stations and other DP slaves to be controlled from a central S5 CPU .
Functionally, the SIEMENS 6ES5308-3UB11 occupies a standard single slot within the S5 expansion unit (EU) and acts as the master on a PROFIBUS-DP network. Its primary role is to process communication tasks, offloading this responsibility from the main CPU. By doing so, the SIEMENS 6ES5308-3UB11 ensures deterministic data exchange with distributed field devices, which is critical for real-time control applications. The module is configured using the COM ET 200 software, which allows engineers to define the bus parameters, connected slaves, and data mapping between the S5 CPU and the PROFIBUS network . While the product is now discontinued and classified as a spare part, the SIEMENS 6ES5308-3UB11 remains a vital component for maintaining the operational integrity of existing legacy automation systems in various industries .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6ES5308-3UB11 |
| Manufacturer | Siemens |
| Product Type | IM308B PROFIBUS-DP Master Interface Module |
| Series | SIMATIC S5 |
| Compatible Systems | S5-100U, S5-115U, S5-135U, S5-155U |
| Communication Protocol | PROFIBUS-DP, SINEC L2 |
| Physical Interfaces | 1 x 9-pin Sub-D (PROFIBUS), 1 x PG/TTY (Programming) |
| Bus Interface | S5 system backplane bus (DIN 41612 connector) |
| Configuration Software | COM ET 200 (MS-DOS based) |
| Status Indicators | PWR, BUS, SF (System Fault), BF (Bus Fault) LEDs |
| Power Supply | 5 V DC from backplane; 24 V DC auxiliary (optional for some modes) |
| Operating Temperature | 0 °C to +60 °C |
| Protection Class | IP20 |
| Weight | Approx. 0.16 – 0.4 kg |
Main Features and Advantages
PROFIBUS-DP Master Functionality
The core function of the SIEMENS 6ES5308-3UB11 is its ability to act as a PROFIBUS-DP master. This allows it to manage data traffic on the network, polling connected DP slaves like the ET 200 series remote I/O stations. It enables the S5 CPU to access a large number of distributed I/O points over a single network cable, significantly simplifying wiring and allowing for modular system expansion. This feature made it a preferred choice for automating complex plants where I/O was spread over a large physical area .
