16 Channels digital input module 24VDC NPN

16 Channels digital input module 24VDC NPN

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Product Description

Product Attributes

Model No.: DT-121F

Packaging & Delivery

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Product Description

DT-121F 16 Channels digital input module 24VDC/NPN/low level is valid

Module Features

The DT-121F 16-channel digital input module by Sichuan Odot is a high-reliability 24VDC NPN input module engineered for demanding Industrial Automation environments, featuring low-level valid logic to accurately acquire signals from dry contacts, active outputs, and 2-/3-wire NPN sensors—including proximity switches, photoelectric sensors, and limit switches. Designed for noise resilience, it ensures precise status detection even in electrically harsh settings near VFDs or motors. Each channel includes a dedicated LED indicator for real-time signal visibility and supports configurable input signal holding time, preventing state loss due to transient interference or communication latency—enhancing overall system stability. Built on a high-speed redundant backplane bus, the module guarantees fast and dependable data transmission, while pluggable terminal blocks (supporting 0.2–1.5 mm² wire) enable tool-free wiring and rapid maintenance, significantly reducing commissioning and downtime. Robust industrial-grade isolation protects against ground loops and common-mode noise, ensuring long-term operational integrity. Successfully deployed in European conveyor sortation systems, North American packaging machine safety circuits, and Southeast Asian smart water treatment control panels, the DT-121F integrates seamlessly with major PLC platforms and complies with CE and industrial EMC standards. As a rugged, easy-to-install, and highly reliable 16-channel NPN digital input module, the DT-121F delivers trusted signal acquisition for global automation integrators.

Technical Parameters

General Parameters
Current Consumption	60mA@5VDC
Field Power	19.2~28.8VDC (Nominal: 24VDC)
Wirring Diameter	Min.0.2mm²(AWG24) Max.1.5mm²(AWG16)
Terminal Pluggable	Support
Backplane Bus	Double bus redundancy
Installation	35mm DIN-Rail
Dimension	1191480mm
Product Certification	CE Certification
Input Parameters
Number of Channels	16 channels input
Indicator	16 channel indicators
Input Characteristics	IEC 61131 ，Type 3
Signal “0”	-5~30VDC (reference potential FV+)
Signal “1”	-30~-11VDC (reference potential FV+)
Minimum Voltage	-30VDC
Maximum Voltage	30VDC
Input Delay	OFF to ON: Max.500μs ON to OFF: Max.500μs
Environment Parameters
Horizontal Installation Operating Temperature	-35℃~60℃
Vertical Installation Operating Temperature	-35℃~50℃
Storage Temperature	-40℃~85℃
Environment Humidity	5%~95%RH (No condensation)
Installation Altitude	<2000m
Pollution Degree	Ⅱ
Protection Grade	IP20
Mechanical Properties	Comply with IEC60068-2-6, IEC6008-2-27
Insulation Withstand	Comply with IEC61131-2
EMC Performance	Comply with IEC61131-2, IEC61000-4 (ESD: Contact discharge ±6kV, Performance level A; Air discharge±8kV, Performance level A SURGE: Common mode ±2kV, Performance level A EFT: ±2kV, Performance level A)

Application scenarios:

FQA

Q：What types of sensors is the DT-1211F module compatible with, and how is its input logic defined?

A：The DT-1211F is designed for NPN sensors, featuring 16 digital input channels where a low-level signal (0V) is considered active (Low-Level Active). It supports dry contacts or active outputs and works with both 2-wire and 3-wire digital sensors.

Q：Does the DT-1211F offer signal stability and status visibility?

A：Yes. It features 16 independent LED indicators—one per channel—for real-time input status visualization, and includes a configurable input signal holding function to reliably capture valid signals even during transient fluctuations.

Q：Is the DT-1211F easy to install and maintain?

A：Yes. Built on a high-speed redundant backplane bus, the module features pluggable terminal blocks for tool-free installation and replacement. Terminals support wire sizes from 0.2 to 1.5 mm² (AWG 24–16), simplifying field wiring and maintenance.

Certifications & Quality Assurance:

ODOT Products comply with international industrial standards, including CE and RoHS, and undergo strict quality control to ensure long-term reliable operation in industrial environments.