MeloAuto-Trusted PLC & DCS Parts Supplier
Core Functionality and Application
The Siemens 6ES5700-3LA12 expansion rack serves as the central mounting chassis for SIMATIC S5-115U distributed control systems. This robust backplane provides physical support and electrical interconnection for up to ten free module slots . It hosts the power supply, CPU, I/O modules, and communication processors within the S5-115U system architecture.
Technical Specifications
The following table details the core technical parameters for the Siemens 6ES5700-3LA12:
| Parameter | Specification |
|---|---|
| Model Number | 6ES5700-3LA12 |
| Product Type | Expansion Rack / Central Mounting Rack |
| Compatible System | SIMATIC S5-115U (Central Controller) |
| Free Module Slots | 10 slots |
| Bus Type | Parallel backplane bus (5V DC logic, 24V DC auxiliary) |
| Dimensions (W × H × D) | 420 × 135 × 280 mm (approx.) |
| Weight | 3.5 kg (approx.) |
| Mounting Type | DIN-rail mount or panel / wall mounting |
| Protection Rating | IP20 (requires installation in control cabinet) |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to 70°C |
| Material | High-grade steel / galvanized sheet metal |
| Origin | Germany |
Design and Integration Features
The Siemens 6ES5700-3LA12 features a sturdy metal construction that withstands harsh industrial environments . Its ten free slots allow flexible configuration of various module types to match specific application needs. The integrated parallel backplane ensures stable, high-speed data exchange between all installed components. Installers will appreciate the straightforward DIN-rail mounting, which simplifies installation and maintenance tasks .
System Compatibility
The Siemens 6ES5700-3LA12 specifically serves as the central mounting rack for S5-115U systems . It supports the installation of CPU modules, power supplies (e.g., 6ES5955 series), and a wide range of I/O and function modules. For distributed setups, users can connect this rack to additional expansion units via interface modules . This rack is a discontinued spare part, so stock availability may be limited .