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Core Functionality and Application
The Siemens 6ES5981-0LA11 rack serves as the central mounting chassis for SIMATIC S5-100U automation systems . This robust backplane provides mechanical support and electrical interconnection for all installed modules. It hosts the power supply, CPU, and I/O modules within the S5-100U system architecture . Furthermore, the rack ensures reliable data exchange between components through its integrated bus system.
Technical Specifications
The following table details the core technical parameters for the Siemens 6ES5981-0LA11:
| Parameter | Specification |
|---|---|
| Model Number | 6ES5981-0LA11 |
| Product Type | Central Rack / Backplane (S5-100U) |
| Number of Slots | 8 slots (module positions) |
| Bus System | Integrated backplane bus |
| Power Supply Slot | Dedicated slot on the left side |
| CPU Slot | Dedicated slot (typically slot 2) |
| I/O Slots | Remaining 6 slots for I/O and function modules |
| Dimensions (W × H × D) | Approx. 280 × 140 × 160 mm |
| Weight | Approx. 1.5 kg |
| Mounting Type | DIN-rail or panel mount |
| Protection Rating | IP20 (requires enclosure) |
| Country of Origin | Germany |
| Lifecycle Status | Discontinued (legacy part) |
Design and Integration Features
The Siemens 6ES5981-0LA11 features a rugged metal construction that withstands industrial environments . Its 8-slot configuration allows flexible system design for small to medium automation tasks. The integrated backplane bus ensures stable high-speed communication between modules . Installers can mount the rack on a standard DIN rail or directly on a panel . The rack’s compact dimensions make it suitable for space-constrained control cabinets.
System Compatibility
The Siemens 6ES5981-0LA11 specifically serves as the central rack for S5-100U systems . It supports the installation of S5-100U CPUs, power supplies, and a wide range of I/O modules. The rack’s expansion interface allows connection to additional expansion units for larger applications . This discontinued rack remains a practical solution for maintaining legacy S5-100U systems.