Siemens SIMATIC S5-101U Central Controller

Description

The Siemens SIMATIC S5-101U (6ES5101-8UA13) is a compact and robust central controller unit from the legacy SIMATIC S5 series. This PLC is designed for small to medium-sized automation tasks and integrates the CPU, power supply, and digital I/O into a single housing. It is a highly sought-after spare part for maintaining existing industrial equipment and control systems that rely on the proven S5 platform.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• Model: S5-101U
• Order Number (MLFB): 6ES5101-8UA13
• Supply Voltage: 120/230V AC
• Digital Inputs: 20 x 24V DC
• Digital Outputs: 12 x Relay Outputs
• Programming Port: PG Interface (DB-15)

Label Info

• SIMATIC S5-101U
• 20 I/E (Inputs)
• 12 Q/A (Outputs)
• 220/240 V~

Application

This PLC is ideal for extending the life of older machinery in various industries, including manufacturing, material handling, and process control. It serves as a direct replacement for failed units, preventing costly system upgrades.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned component, you contribute to the circular economy and avoid the emission of approximately 24 kg of CO2, which would have been generated during the production of a new unit.

Availability

This is an obsolete item, available as a tested, used component. Stock is limited. Order now from PLC2Day for expert support and fast delivery.

FAQ

The SIMATIC S5 series, including the S5-101U, is programmed using Siemens STEP 5 software. This is legacy software and is not compatible with modern TIA Portal.

Yes, the S5-101U has a user-replaceable battery to back up the program memory. The battery compartment is typically accessible from the front panel.

No, not natively. The S5-101U does not have built-in Profibus or Profinet capabilities. Connection to such networks would require specific S5-era communication modules, which are also obsolete and difficult to find.

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Last Update: Friday, March 13, 2026