Siemens 6ES5188-3UA32 Central Rack for SIMATIC S5-115U

This rack houses the CPU, power supply, and I/O modules for your control system. The Siemens 6ES5188-3UA32 provides 8 slots for mounting S5 series modules. It measures 482 mm in width and 200 mm in height. This unit weighs approximately 3.5 kg for cabinet installation.

Technical Specifications Table

Internal Design and Backplane Architecture

This central rack uses a passive backplane PCB for signal distribution. Eight slot connectors link each module to the internal bus. The Siemens 6ES5188-3UA32 positions the power supply in the leftmost slot for proper cooling. The CPU occupies the second slot for direct backplane control. Remaining six slots accept any combination of I/O modules. The passive design introduces no signal delay or active termination. Consequently, this rack supports high-speed communication between all installed modules.

Installation and Module Placement Guide

First, mount this rack into a standard 19-inch cabinet using four M6 screws. Next, install the power supply module into the leftmost slot firmly. Then, insert your CPU module into the second slot from the left. Fill the remaining six slots with digital or analog I/O modules as needed. Connect the ground terminal to your system’s earth ground for safety. The rack requires at least 100 mm clearance for proper air circulation. This central rack works with all S5-115U specific modules. Always slide modules into the guide rails before pressing them onto the backplane connector.