Analog/Digital Input Module for Feedback Controllers

Product Specifications

Technical details and manufacturing context for Analog/Digital Input Module

Definition

An Analog/Digital Input Module is a component used in industrial feedback control systems. It serves as the interface between field devices—such as sensors and switches—and the controller's logic unit. The module receives low-voltage analog signals (e.g., 4-20 mA current loops or 0-10V DC voltage) from sensors and discrete digital signals (e.g., 24V DC on/off) from switches. It conditions, isolates, and digitizes these signals, converting analog values to digital data and reading digital states. The processed data is then transmitted via a communication bus (e.g., Profibus, Ethernet/IP) to the main controller CPU for closed-loop control decisions. The module typically features 8 to 32 configurable inputs, with analog input resolution of 12 to 16 bits and accuracy of ±0.1% of full scale at 25°C. It supports sampling rates from 100 to 1000 Hz per channel. Digital inputs are compatible with Type 1 and Type 3 sensors per IEC 61131-2, with a nominal voltage of 24V DC ±10%. The module provides channel-to-channel and channel-to-bus isolation of 1500V AC per IEC 61010-1. It operates over a temperature range of -40 to 85°C and can be stored in the same range. Relative humidity tolerance is 5 to 95% non-condensing per IEC 60068-2-78. The protection rating is IP20 for cabinet installation. Power supply is 24V DC ±10% with reverse polarity protection, and power consumption ranges from 2 to 5W depending on active channels. The module weighs between 150 and 300g. Materials include FR-4 PCB, electronic components, plastic or metal housing, and copper connectors. These specifications are typical reference ranges; verify model-specific values with the manufacturer.

Working Principle

The module receives analog signals from sensors (e.g., 4-20 mA, 0-10V) and digital signals from switches (e.g., 24V DC). Analog channels use analog-to-digital converters (ADCs) to convert voltage or current to digital values. Digital channels use opto-isolators for electrical isolation and read on/off states. The module conditions signals (filtering, amplification) and transmits data via a communication bus to the controller CPU. The CPU uses this data for control logic. The module's isolation protects the controller from electrical noise and ground loops.

Common Materials

FR-4 PCB, Electronic Components (ICs, resistors, capacitors), Plastic/ Metal Housing, Copper Connectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Inputs	8–32	Configurable per module
Input Voltage Range	0–10 V DC	For analog voltage inputs
Input Current Range	4–20 mA	Standard industrial current loop
Digital Input Voltage	24 ±10% V DC	Type 1 and 3 compatibleIEC 61131-2
Resolution	12–16 bit	Analog input resolution
Accuracy	±0.1 % FS	At 25 °C, typical
Sampling Rate	100–1000 Hz	Per channel, configurable
Isolation Voltage	1500 V AC	Channel-to-channel and channel-to-busIEC 61010-1
Operating Temperature	-40–85 °C	Extended temperature rangeIEC 60068-2-1/2
Storage Temperature	-40–85 °C	Non-operating
Relative Humidity	5–95 % RH	Non-condensingIEC 60068-2-78
Protection Rating	IP20	For cabinet installationIEC 60529
Power Supply	24 ±10% V DC	Reverse polarity protected
Power Consumption	2–5 W	Depends on number of active channels
Weight	150–300 g	Varies with configuration

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Terminal Block
Provides screw terminals for connecting external sensor and switch wires.

Material: Plastic with metal contacts
Signal Conditioning Circuit
Filters, amplifies, and isolates incoming analog signals before ADC conversion.

Material: FR-4 PCB with electronic components
Analog-to-Digital Converter (ADC)
Converts conditioned analog voltage/current signals into digital values.

Material: Integrated Circuit (IC)
Opto-isolator Array
Provides electrical isolation and state detection for digital input channels.

Material: Integrated Circuit (IC) with LEDs and phototransistors
Communication Interface Chip
Manages data protocol (e.g., Profibus, Ethernet/IP) for transmitting input data to the controller.

Material: Integrated Circuit (IC)

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Feedback Controller

View system integration details

Manufacturers of Analog/Digital Input Module

Manufacturer profiles associated with Analog/Digital Input Module.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What types of signals can this module accept?

It accepts analog signals such as 4-20 mA current loops and 0-10V DC voltage, and digital signals such as 24V DC on/off states from switches.

How many inputs does the module have?

The number of inputs is configurable, ranging from 8 to 32 per module, depending on the specific model and configuration.

What is the isolation voltage?

The module provides channel-to-channel and channel-to-bus isolation of 1500V AC, as referenced in IEC 61010-1. Verify for your model.

What communication protocols are supported?

The module transmits data via communication buses such as Profibus or Ethernet/IP. The exact protocol depends on the module variant; check with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (electronic module)
other spec:	Input voltage range: 24V DC ±20%, isolation voltage: 500V AC, sampling rate: 1kHz per channel
temperature:	-20°C to +70°C operating, -40°C to +85°C storage

Analog/Digital Input Module

Product Specifications

Applied To / Applications

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