Siemens 6ES5421-8MA12 Simatic S5 Digital Input Module

Availability: 4 left in stock

DescriptionThe Siemens 6ES5421-8MA12 is a digital input module engineered for the Simatic S5-090, S5-095, and S5-100 automation families. This 8-channel...

SKU: 6ES5421-8MA12

Manufacturer: Siemens
Product No.: 6ES5421-8MA12
Product Type: Digital Input Module
Product Origin: Germany
Payment:T/T, Western Union
Weight: 180g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Description

The Siemens 6ES5421-8MA12 is a digital input module engineered for the Simatic S5-090, S5-095, and S5-100 automation families. This 8-channel module is designed to interface field-level sensors, switches, and proximity devices with the central controller, converting DC field signals into reliable binary logic for processing. It is specifically optimized for applications requiring compact, high-density I/O, such as discrete manufacturing, automated assembly, and material handling systems.

Features

8-channel digital input configuration for high-density signal acquisition.
Native integration with Simatic S5 backplane architectures.
Integrated RC filtering to mitigate contact bounce and high-frequency EMI.
Low power consumption design, drawing minimal current from the backplane bus.
Standardized 24 VDC input logic suitable for common industrial sensor interfaces.

Applications

This module is frequently utilized in small-to-medium scale automation tasks including:

Automated assembly line status monitoring.
Material handling and conveyor control systems.
Water treatment facility process instrumentation.
General discrete manufacturing logic control.

Technical Specifications

Model	6ES5 421-8MA12
Number of Inputs	8 channels
Input Voltage	24 VDC
Signal Logic	Type 1
Input Current	7 mA typical at 24 VDC per channel
Power Consumption	0.5 W max (from backplane)
Operating Temperature	0 to 60 deg C
Storage Temperature	-40 to 70 deg C

Installation Guidelines

Ensure the PLC rack power is disconnected before installing or removing the module to prevent electrical damage.
Verify that the module is correctly seated in the backplane slot to ensure reliable ribbon connection.
Route signal wiring away from high-voltage power cables and sources of heavy electromagnetic interference to maintain signal integrity.
Ensure the ambient operating temperature remains within the specified 0 to 60 deg C range to prevent thermal degradation.
Use appropriate shielded cabling for field inputs to minimize noise pickup in high-EMI environments.

FAQ

Does this module require external power for the inputs?

The 6ES5421-8MA12 typically utilizes the 24 VDC supply provided through the system backplane or common field power; please refer to your specific S5 CPU rack wiring diagram for exact power distribution requirements.

Is this module compatible with S5-115U systems?

No, this module is specifically designed for the Simatic S5-090, 095, and 100 series. It is not intended for use in the S5-115U or higher-tier rack systems.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.