Siemens SIMATIC S5 Digital Output Module

Description

The Siemens 6ES5451-8MR12 is a digital output module for the legacy SIMATIC S5 series of programmable logic controllers. It features 8 floating relay outputs, making it highly versatile for switching a wide range of both AC and DC loads. This module is an essential component for maintaining or expanding automation systems built on the robust and widely deployed S5 platform, such as the S5-90U, S5-95U, S5-100U, and ET 200U peripherals.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S5
• Type Number: 6ES5 451-8MR12
• Product Type: Digital Output Module
• Number of Outputs: 8
• Output Type: Floating Relay Contacts
• Rated Voltage: 24 V DC to 230 V AC
• Switching Current: Max. 2 A per output
• Isolation: Galvanically isolated

Label Info

• Model: 1P 6ES5 451-8MR12
• E-Stand: 03

Application

This module is ideal for applications requiring the control of higher voltage or current loads that cannot be driven directly by transistor outputs. Common uses include driving contactors, solenoid valves, motors, and indicator lamps in industrial machinery and process control systems.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned module, you are contributing to a circular economy and preventing approximately 12 kg of CO2 emissions associated with new production. This saving is comparable to the emissions from a 60-kilometer car journey.

Availability

This is an obsolete item, available from our stock while supplies last. A critical spare part for extending the operational life of your SIMATIC S5 systems. Order now from PLC2Day for expert support and fast delivery.

FAQ

This module is designed for the Siemens SIMATIC S5-90U, S5-95U, S5-100U, as well as the ET 100U and ET 200U distributed I/O systems.

'E-Stand' refers to the engineering status or hardware revision of the module. In this case, '03' indicates the third hardware revision. While generally interchangeable, compatibility with very old CPUs or specific functionalities should be checked in the system manual.

While it may be physically possible, it is not a direct swap. Relay outputs are slower but can handle higher voltages (AC/DC) and currents. Transistor outputs are faster but are limited to DC loads and lower currents. You must ensure the application's speed requirements are met and that wiring is adjusted for the different output characteristics.

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Last Update: Friday, March 13, 2026