Siemens SIMATIC S5 Programmable Logic Controller S5-90U

Description

The 6ES5090-8MA01 is a compact and robust PLC from the proven Siemens SIMATIC S5 family. As a model S5-90U, it offers an all-in-one solution with integrated digital inputs and relay outputs, making it ideal for smaller automation tasks and for use as a spare part to maintain existing machinery. This controller is known for its durability and reliable performance in industrial environments.

Specifications

• Manufacturer: Siemens
• Series: SIMATIC S5
• Model: S5-90U
• Supply Voltage: 24V DC
• Digital Inputs: 10
• Digital Outputs: 6 (Relay)
• Programming: Requires STEP 5 software

Label Info

• Part Number: 6ES5 090-8MA01
• E-Stand (Version): 03

Application

This PLC is perfectly suited for controlling small-scale machines, process automation, and as a direct replacement part in systems built with SIMATIC S5 technology. Its relay outputs provide flexibility for switching various AC and DC loads.

Country of Origin

Made in Germany.

CO2 Impact

Opting for this refurbished component over a new one prevents the emission of approximately 20.0 kg of CO2, contributing to a more sustainable industrial practice.

Availability

This item is an obsolete component but is available from our stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

The SIMATIC S5 series is programmed using STEP 5 software. This is legacy software and requires a specific programming environment, often running on older operating systems or in a virtual machine.

Yes, this PLC uses a backup battery to retain the user program and data in its RAM memory when the main power is turned off. It is crucial to check and replace this battery periodically to prevent program loss.

Direct connection to modern Ethernet-based HMIs is not possible. Communication with the S5-90U is typically done via its serial interface. You would need an HMI that supports the appropriate S5 protocols (like AS511) or use a protocol converter gateway.

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Last Update: March 13, 2026