Siemens 6ES5188-3UA21 SIMATIC S5 Central Unit

Description

The 6ES5188-3UA21 is a central rack assembly designed for the SIMATIC S5-135U and S5-155U programmable logic controller systems. This unit provides a robust foundation for high-performance automation tasks, featuring 21 slots for modular expansion and configuration. It is equipped with an integrated power supply capable of handling 230/115 V AC input, delivering a regulated 5 V, 40 A output to the backplane. Note that this unit is supplied without a CPU module and without documentation. As a central component in legacy SIMATIC S5 architectures, it serves as the primary mounting and power distribution base for processors, I/O modules, and communication modules in large-scale control applications.

Features

• Large-Scale Expansion: Features 21 slots for extensive I/O and communication module installation.
• Integrated Power: Built-in power supply unit with 230/115 V AC input and 5 V DC, 40 A output.
• System Compatibility: Designed specifically for the high-end SIMATIC S5-135U and S5-155U range.
• Modular Configuration: Provides the flexibility to insert various CPU types depending on specific control requirements.

Applications

• Large-scale industrial process control
• Retrofitting and maintenance of existing S5-135U/155U installations
• Multi-axis machine tool control
• Complex production line automation requiring high I/O density

Technical Specifications

Installation Guidelines

• Mounting: Due to its weight (19.40 kg), ensure the rack is mounted to a high-strength industrial cabinet backplane capable of supporting the static load.
• Ventilation: The high power output of this unit generates heat; ensure clear airflow paths through the rack and sufficient cabinet ventilation.
• Wiring: Connect the AC supply according to local electrical codes, ensuring the ground connection is established to the cabinet common ground.
• Module Insertion: Always power down the unit before inserting or removing CPU or I/O modules to prevent electrical arcing or damage to the backplane connectors.