Product Overview
The SIEMENS 6ES5305-7LB11 is an IM305 interface module specifically designed for the SIMATIC S5-115U programmable logic controller series, serving as the critical link between a central controller and a single expansion unit (EU) in a centralized automation configuration . This SIEMENS 6ES5305-7LB11 module provides the physical and electrical connection necessary to expand the I/O capacity of an S5-115U system, allowing additional input and output modules to be housed in a separate ER 701-0 or ER 701-1 mounting rack . The 6ES5305-7LB11 distinguishes itself from related IM305 variants by featuring a permanently attached 1.5-meter connecting cable, offering greater flexibility in positioning the expansion unit adjacent to or near the central controller .
The SIEMENS 6ES5305-7LB11 module functions as a two-piece assembly, with the interface modules permanently connected by the integrated cable . This design simplifies installation while ensuring reliable signal transmission between the central controller and the expansion rack. The 6ES5305-7LB11 supplies the expansion unit with both the required 5V DC operating voltage and the internal bus signals necessary for proper I/O module communication . In this centralized configuration, the SIEMENS 6ES5305-7LB11 employs fixed slot addressing, meaning that I/O module addresses are permanently assigned to specific physical slots within the expansion rack . As the SIMATIC S5 series has been globally discontinued for over two decades, the SIEMENS 6ES5305-7LB11 is now available exclusively through legacy spare parts channels, making it an essential component for facilities continuing to operate S5-115U-based automation equipment where full system migration is not yet feasible .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6ES5305-7LB11 |
| Manufacturer | Siemens |
| Product Type | IM305 Interface Module (Expansion Unit Interface) |
| Series | SIMATIC S5 |
| Compatible System | S5-115U Central Controller and ER 701-0/ER 701-1 Expansion Units |
| Included Cable Length | 1.5 meters (permanently attached) |
| Configuration Type | Centralized (one EU per central controller) |
| Current Supplied to EU | Max. 1 A |
| Current Consumption (5V) | 10 mA |
| Power Loss | Max. 0.05 W |
| Weight (complete assembly) | Approx. 0.6 kg (1.3 lb) |
| Weight (with packaging) | 1.3 kg |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -40°C to +70°C |
| Protection Rating | IP20 (cabinet installation) |
| Addressing Mode | Fixed slot addressing |
| Product Status | Discontinued (Legacy spare parts only) |
| Country of Origin | Germany |
Main Features and Advantages
Integrated Cable Design: The SIEMENS 6ES5305-7LB11 features a permanently attached 1.5-meter connecting cable that links the two interface modules required for central-to-expansion unit communication . This integrated design eliminates the need for separate cable procurement and ensures optimal signal integrity between the central controller and expansion rack. The SIEMENS 6ES5305-7LB11‘s cable length provides sufficient flexibility for positioning the expansion unit adjacent to or near the central controller, making it suitable for most cabinet layouts while maintaining reliable bus communication.
Centralized Configuration Support: The SIEMENS 6ES5305-7LB11 enables a proven centralized architecture where one central controller (CC 0, CC 1, CC 2, or CC 3) connects via short connecting cables to expansion units . This configuration simplifies system design and troubleshooting while providing the I/O expansion capability required for many S5-115U applications. The SIEMENS 6ES5305-7LB11 uses fixed slot addressing, where I/O module addresses are permanently assigned to specific slots in the expansion rack—for example, slot 0 in the central controller may be reserved for byte addresses 0 to 3 . This predictable addressing scheme simplifies system configuration and module replacement.
Robust and Reliable Operation: The SIEMENS 6ES5305-7LB11 is engineered for industrial environments, offering low power consumption of just 0.05 W maximum and minimal 5V current draw of 10 mA . The SIEMENS 6ES5305-7LB11 supplies up to 1 A of current to the connected expansion unit, ensuring adequate power for standard I/O configurations . With its IP20 protection rating and wide operating temperature range, the SIEMENS 6ES5305-7LB11 delivers reliable performance in demanding industrial settings. For maintenance engineers and system integrators supporting legacy S5 installations, the SIEMENS 6ES5305-7LB11 represents a critical spare part that enables continued operation of S5-115U-based machinery, providing a cost-effective alternative to full system replacement .
