Siemens U-55N SIMATIC 16-Point Digital Input Module

Siemens U-55N SIMATIC Digital Input Module

Availability: 7 left in stock

Description The Siemens U-55N is a 16-point digital input module designed for integration within SIMATIC legacy automation systems. This module...

SKU: U-55N

Manufacturer: Siemens
Product No.: U-55N
Product Type: Digital Input Module
Product Origin: Germany
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Description

The Siemens U-55N is a 16-point digital input module designed for integration within SIMATIC legacy automation systems. This module provides a reliable interface between field-side discrete signals—such as limit switches, proximity sensors, and auxiliary contacts—and the main PLC backplane. By supporting a flexible 12/24 VAC/DC input range, the U-55N is well-suited for diverse industrial environments, including power generation, oil and gas processing, and manufacturing automation, where maintaining legacy hardware stability is critical.

Features

16 discrete input channels with integrated opto-electrical isolation to protect the PLC backplane from transients.
Dual-mode compatibility for both AC and DC signal sources.
Integrated status LEDs for each channel, providing immediate visual feedback on input signal state and wiring integrity.
High-speed signal processing architecture designed to minimize latency and ensure accurate scan cycle capture.
Compact, rack-mount design optimized for standard SIMATIC chassis integration.

Technical Specifications

Model	U-55N
Brand	Siemens
Series	SIMATIC
Module Type	Digital Input Module
Input Points	16
Voltage Rating	12/24 VAC/DC
Power Consumption	1.5 W (Typical)
Isolation	Optocoupler
Operating Temperature	0 to 60 deg C
Storage Temperature	-40 to +70 deg C

Installation Guidelines

Ensure the system power is disconnected before installing or removing the module from the rack.
Use shielded cabling for field inputs to reduce EMI interference in high-noise industrial environments.
Verify that the input voltage matches the module rating (12/24 VAC/DC) to prevent damage to internal circuitry.
Ensure adequate airflow within the cabinet to maintain operating temperatures below 60 deg C.
Handle with standard ESD precautions to prevent damage to sensitive internal components.

FAQ

Does the U-55N support both AC and DC signals?
Yes, the module is engineered to handle both 12/24 VAC and VDC inputs, making it highly versatile for legacy control systems.

What is the primary function of the onboard LEDs?
The status LEDs provide a real-time visual indicator for each of the 16 channels, allowing for rapid troubleshooting of field wiring and signal presence.

Is this module compatible with modern SIMATIC systems?
The U-55N is specifically designed for legacy SIMATIC platforms. Please verify your specific rack and CPU compatibility before installation.

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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.

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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.

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Engineering Lead, Germany

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