Siemens Simatic S7 S7-400 6ES7403-1TA11-0AA0 Racks

Overview

The 6ES7403-1TA11-0AA0 (6ES74031TA110AA0) is a heavy-duty ER1 Extension Rack designed for the SIMATIC S7-400 automation system. This 18-slot chassis provides the physical framework and backplane communication necessary to expand the I/O capacity of an S7-400 controller. Engineered for maximum durability, the ER1 variant is specifically used for "Extension" purposes where local or remote I/O modules are required, but where certain central processing functions (like multi-computing) are not utilized in that specific rack. It serves as the backbone for high-density I/O configurations in large-scale industrial plants.

Detailed Specifications

Structural Capabilities

The 6ES7403-1TA11-0AA0 is designed for the expansion of peripheral modules (Signal Modules, Function Modules, and Communication Processors). It features a "P-Bus" backplane, which allows for the high-speed exchange of I/O data. However, unlike the UR (Universal Rack) series, the ER1 does not support the "K-Bus" (Communication Bus), meaning it cannot house certain communication modules or CPUs that require inter-processor communication. Its 18-slot capacity makes it one of the largest expansion frames available, ideal for centralized cabinets managing hundreds of I/O points.

Technical FAQ

What is the main difference between the ER1 and the UR1 rack?

The ER1 (6ES7403-1TA11-0AA0) only supports the P-Bus (Peripheral Bus) and is intended solely for I/O expansion. The UR1 (Universal Rack) supports both P-Bus and K-Bus, allowing it to house CPUs and more complex communication processors.

How do I connect this rack to the Central Controller?

To link the ER1 to a central S7-400 rack, you must install an IM 461 interface module in the ER1 and connect it via a specialized cable to an IM 460 module located in the central rack.