Analog Input Module for Data Acquisition Systems

Product Specifications

Technical details and manufacturing context for Analog Input Module

Definition

An analog input module is a specialized hardware component within a Data Acquisition System (DAS) that serves as the interface between continuous physical measurements and digital processing. It receives low-level analog electrical signals from sensors and transducers, such as temperature, pressure, voltage, or current, and conditions them for accurate digitization. The module typically includes signal conditioning circuits that may amplify, filter, and isolate the incoming signal to ensure it is within a suitable range and quality for conversion. The conditioned signal is then fed to an Analog-to-Digital Converter (ADC), which samples the signal at a specified rate and resolution, converting the continuous voltage or current into a discrete digital value. This digital data is subsequently transmitted to the system's central processor or controller via a communication bus such as Ethernet, Profibus, or Modbus. Analog input modules are available with varying numbers of channels (typically 4 to 16) to accommodate different sensor counts. They support various input types, including voltage (0–10 V), current (0–20 mA), resistance temperature detectors (RTD), and thermocouples (TC). Key parameters include resolution (12–24 bits), accuracy (±0.1–±0.5% of full scale), sampling rate (10–1000 Hz), input impedance (≥1 MΩ), and isolation voltage (500–2500 V DC, per IEC 61010). The module operates over a wide power supply range (9–36 V DC) and is designed for industrial environments with operating temperatures from -40 to 85 °C and storage temperatures from -40 to 105 °C, as per IEC 60068-2-1/2. It also meets humidity requirements (5–95% RH, non-condensing, per IEC 60068-2-78) and offers ingress protection ratings from IP20 to IP67 (per IEC 60529). The module's physical characteristics, such as weight (100–500 g) and dimensions (e.g., 25 x 100 x 120 mm to 45 x 120 x 150 mm), vary by model. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The module receives a low-level analog signal from a sensor. This signal first passes through signal conditioning circuits, which may include amplification, filtering, and isolation, to bring it to a suitable range and quality. The conditioned analog signal is then fed to an Analog-to-Digital Converter (ADC), which samples the signal at a specified rate and resolution, converting the continuous voltage or current into a discrete digital value (binary number). This digital data is then transmitted to the system's central processor or controller via a communication bus (e.g., Ethernet, Profibus, Modbus).

Common Materials

Printed Circuit Board (PCB), Semiconductors (ICs, ADC chips), Connectors, Passive components (resistors, capacitors)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Channels	4–16	Select based on number of sensors to connect.
Input Type	0–10 V, 0–20 mA, RTD, TC	Must match sensor output signal.
Resolution	12–24 bit	Higher resolution for finer measurement.
Accuracy	±0.1–±0.5 % FS	Critical for precise control.
Sampling Rate	10–1000 Hz	Faster for dynamic signals.
Input Impedance	≥1 MΩ	High impedance to avoid loading sensor.
Isolation Voltage	500–2500 V DC	Protects against voltage spikes.IEC 61010
Power Supply	9–36 V DC	Wide range for industrial use.
Operating Temperature	-40–85 °C	Exceeding range may cause failure.IEC 60068-2-1/2
Storage Temperature	-40–105 °C	For non-operating conditions.IEC 60068-2-1/2
Humidity Range	5–95 % RH	Non-condensing.IEC 60068-2-78
Ingress Protection	IP20–IP67	Higher IP for harsh environments.IEC 60529
Weight	100–500 g	Affects mounting and handling.
Dimensions (W x H x D)	25 x 100 x 120 – 45 x 120 x 150 mm	Check for DIN rail compatibility.

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

Signal Conditioning Circuitry
Amplifies, filters, isolates, and linearizes the raw sensor signal to prepare it for the ADC.

Material: Semiconductors, Resistors, Capacitors
Analog-to-Digital Converter (ADC) Chip
The core integrated circuit that converts the conditioned analog voltage into a digital number.

Material: Semiconductor (Silicon)
Input Connector/ Terminal Block Part
Provides the physical interface for connecting wires from field sensors to the module.

Material: Plastic, Metal (often brass or phosphor bronze)
Communication Interface Circuitry
Manages the protocol (e.g., Modbus, Profinet) for sending digitized data to the host system.

Material: Semiconductors, PCB

Applied To / Applications

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

Data Acquisition System

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Data Acquisition Terminal

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PID Controller / PLC Module

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Data Acquisition Unit

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Control Panel with PLC

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Data Acquisition Unit (DAU)

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Substation Controller

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Manufacturers of Analog Input Module

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Sichuan Odot Automation System Co., Ltd.

Sichuan, CN

Also makes: Protocol Gateway/Converter, Industrial Switch, Digital Output Module and 8 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What types of sensors can be connected to an analog input module?

The module supports various input types including voltage (0–10 V), current (0–20 mA), resistance temperature detectors (RTD), and thermocouples (TC). The specific input type must match the sensor output signal.

What is the typical resolution of an analog input module?

Resolution typically ranges from 12 to 24 bits. Higher resolution allows finer measurement of the analog signal, but the actual value depends on the specific model.

How does the module communicate with the control system?

After digitization, the module transmits the digital data to the central processor or controller via a communication bus such as Ethernet, Profibus, or Modbus. The exact protocol depends on the module's design.

What environmental conditions can the module withstand?

The module is designed for industrial use with an operating temperature range of -40 to 85 °C and storage temperature of -40 to 105 °C, per IEC 60068-2-1/2. It also operates in humidity from 5 to 95% RH (non-condensing) and offers ingress protection from IP20 to IP67. Always verify with the manufacturer for specific models.

Data Basis

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

Preliminary Technical Classification

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pressure:	0 to 10 bar
other spec:	Input voltage range: ±10V, ±5V, 0-20mA, 4-20mA
temperature:	-40°C to +85°C

Analog Input Module

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards

Manufacturers of Analog Input Module

Procurement Evaluation Criteria

Supply Chain Compatible Machinery & Devices

Frequently Asked Questions

What types of sensors can be connected to an analog input module?

What is the typical resolution of an analog input module?

How does the module communicate with the control system?

What environmental conditions can the module withstand?

Data Basis

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