Comprehensive Product Summary – Dataforth MAQ20-FREQ Frequency Input Module

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### 1. Product Overview

Product Name: MAQ20-FREQ
Model Number: MAQ20-FREQ
Series: MAQ20 Data Acquisition and Control System
Article Number: MAQ20-FREQ
Manufacturer: Dataforth Corporation
Product Type: Frequency Input Module (Analog Input Module – Frequency)
Mounting Type: DIN Rail Mount (to MAQ20 Backbone)
Product Description: 8-channel frequency input module designed for high-performance data acquisition systems, capable of measuring frequencies from 0.5Hz to 1MHz with 50mV sensitivity. Provides robust isolation, configurable alarms, and excitation outputs for sensor interfacing.

The MAQ20-FREQ is part of Dataforth’s modular MAQ20 data acquisition and control platform, engineered for industrial and laboratory environments requiring precise frequency measurement, signal conditioning, and system integration. It offers high isolation, flexible configuration, and reliable performance across a wide temperature range.

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### 2. Key Features

- Eight Independent Input Channels: Each channel can measure frequency signals independently, allowing simultaneous monitoring of multiple sources.
- Wide Frequency Range: Supports input frequencies from 0.5Hz to 1MHz, including state change detection for digital or pulse-type signals.
- High Sensitivity: 50mV input sensitivity enables accurate detection of low-level signals from magnetic pickups, contact closures, or TTL sources.
- Configurable Alarms: Each channel supports High, High-High, Low, and Low-Low alarm thresholds for process monitoring and fault detection.
- Excitation Outputs: Four independent 5V excitation sources (8mA each) can power external sensors or serve as logic-level outputs.
- Robust Electrical Isolation: Provides 1500Vrms input-to-bus isolation for safety and noise immunity.
- Channel Protection: Each input channel is protected up to 240Vrms continuous and meets ANSI/IEEE C37.90.1 transient protection standards.
- Selective Channel Scanning: Non-used channels can be disabled to increase the effective sampling rate of active channels.
- High Accuracy and Resolution: 32-bit resolution with clock accuracy of ±0.003% (typical) and ±0.01% over temperature range.
- Compact DIN Rail Form Factor: Designed for easy integration into MAQ20 backplanes and industrial control panels.
- Wide Operating Temperature Range: –40°C to +85°C for reliable operation in harsh environments.
- Compliance and Safety: Meets CE and heavy industrial EMC standards; ATEX and UL Class I, Division 2 certifications pending.

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### 3. Technical Specifications

General Specifications:
- Model: MAQ20-FREQ
- Type: Frequency Input Module
- Number of Channels: 8
- Input Signal Sensitivity: 50mV
- Frequency Range: 0.5Hz to 1MHz plus state change detection
- Operating Range: DC + signal ≤ 300Vrms
- Excitation Outputs: Four 5V sources, 8mA each (for sensor excitation or logic output)
- Resolution: 32 bits
- Clock Accuracy: ±0.003% typical
- Clock Accuracy (Over Temperature): ±0.01% (–40°C to +85°C)
- Scan Rate: 1000 channels per second (Ch/s)
- Power Supply Current: 400mA

Isolation and Protection:
- Input-to-Bus Isolation: 1500Vrms for 1 minute
- Channel-to-Channel Isolation: 0V (common reference)
- Continuous Input Protection: 240Vrms maximum
- Transient Protection: ANSI/IEEE C37.90.1 compliant

Physical Characteristics:
- Dimensions (H × W × D): 114.6mm × 15.3mm × 82.8mm (4.51" × 0.60" × 3.26")
- Mounting: DIN Rail (MAQ20 backbone)
- Weight: Approximately 100–120g (typical for MAQ20 modules)
- Material: Industrial-grade thermoplastic housing with integrated shielding and pluggable terminal block connectors

Environmental Ratings:
- Operating Temperature: –40°C to +85°C
- Storage Temperature: –40°C to +85°C
- Relative Humidity: 0–95% non-condensing
- EMC Emissions: EN61000-6-4 ISM Group 1, Class A (radiated and conducted)
- EMC Immunity: EN61000-6-2 ISM Group 1
- RF Performance: Performance Class A, ±0.5% span error
- ESD/EFT Performance: Performance Class B

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### 4. Functionality

The MAQ20-FREQ module is designed to measure and process frequency-based signals from a variety of sources, including magnetic pickups, contact closures, zero-crossing detectors, and TTL logic signals. Each of the eight channels operates independently, allowing simultaneous acquisition of multiple frequency inputs.

Operating Principle:
Incoming frequency signals are conditioned through threshold comparators and signal processors before being digitized and transmitted across the MAQ20 system bus. The module’s internal clock provides precise timing for frequency measurement, ensuring high accuracy and stability across the full operating temperature range.

Use Cases and Applications:
- Industrial process monitoring (e.g., flow meters, turbine sensors, rotating machinery)
- Motor speed and shaft rotation measurement
- Pulse counting and event detection
- Vibration analysis and mechanical diagnostics
- Laboratory instrumentation and test benches
- Embedded control systems requiring frequency or pulse input acquisition

Compatibility:
- Fully compatible with the MAQ20 Data Acquisition and Control System backbone.
- Integrates seamlessly with MAQ20 communication modules (Ethernet, USB, RS-485).
- Works with Dataforth’s MAQ20 software tools and configuration utilities for setup, calibration, and data logging.

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### 5. Components & Accessories

Included Components:
- MAQ20-FREQ module unit
- Pluggable terminal block for field I/O connections (with shield termination positions)
- DIN rail mounting clip (integrated)
- Quick start guide and documentation reference

Optional Accessories:
- MAQ20 backbone and power supply modules
- Communication modules (MAQ20-COMx series)
- Additional terminal blocks and wiring harnesses
- MAQ20 software suite for configuration and data acquisition
- Protective covers and labeling kits

Connectors:
- Field I/O via pluggable terminal block
- Bus connection via MAQ20 system backplane connector
- Shield termination points provided for noise reduction and grounding integrity

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### 6. Installation & Setup

Installation Requirements:
- Mounts directly onto a MAQ20 DIN rail backbone.
- Requires a 24VDC system power supply (nominal).
- Ensure adequate ventilation and spacing for thermal management.

Mounting Options:
- Standard 35mm DIN rail mounting compatible with MAQ20 system chassis.
- Snap-in installation with secure mechanical and electrical connection to the backbone.

Configuration:
- Channel configuration performed through MAQ20 software or host controller interface.
- Each channel can be individually set for frequency range, alarm thresholds, and excitation output control.
- Non-used channels can be disabled to optimize scan rate and system performance.
- Alarm settings (High, High-High, Low, Low-Low) can be programmed for each channel to trigger system responses or notifications.

Wiring Guidelines:
- Use shielded twisted-pair cables for frequency input signals.
- Connect shields to designated terminal block positions.
- Observe polarity and grounding recommendations per the MAQ20 hardware manual (MA1048).

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### 7. Performance & Capabilities

Measurement Performance:
- Frequency measurement range: 0.5Hz to 1MHz
- Input sensitivity: 50mV
- Resolution: 32-bit digital conversion
- Accuracy: Determined by internal clock precision (±0.003% typical)
- Temperature stability: ±0.01% over full operating range

Sampling and Throughput:
- Maximum scan rate: 1000 channels per second
- Selective channel enabling allows higher effective sampling rates for active channels.

Excitation and Output Performance:
- Four 5V excitation outputs, each capable of sourcing 8mA.
- Outputs can be used for powering sensors or as logic-level control signals.

Isolation and Protection:
- 1500Vrms isolation barrier between input and system bus ensures safety and signal integrity.
- Each channel protected up to 240Vrms continuous input voltage.
- Transient protection compliant with ANSI/IEEE C37.90.1 standards.

Limitations:
- Channel-to-channel isolation is 0V (common reference).
- Input signals exceeding 300Vrms (DC + AC) may damage the module.
- Excitation outputs limited to 8mA per channel; external power may be required for higher current sensors.

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### 8. Standards & Compliance

Quality and Manufacturing:
- Manufactured under ISO 9001:2008 Registered Quality Management System.

Electrical and EMC Compliance:
- Emissions: EN61000-6-4 ISM Group 1, Class A (industrial environment)
- Immunity: EN61000-6-2 ISM Group 1
- Transient Protection: ANSI/IEEE C37.90.1
- RF Performance: Class A, ±0.5% span error
- ESD/EFT Performance: Class B

Safety and Hazardous Location Approvals:
- CE Mark: Heavy Industrial CE compliance
- ATEX Certification: Pending (for explosive atmosphere applications)
- UL Certification: Pending, Class I, Division 2, Groups A, B, C, D (hazardous locations)

Environmental Compliance:
- Designed for operation in harsh industrial environments with wide temperature and humidity tolerance.

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### 9. Additional Information

Warranty:
- Standard Dataforth limited warranty (contact manufacturer for terms).

Support and Documentation:
- Comprehensive hardware user manual available: MA1048 – MAQ20 Frequency Input Module Hardware User Manual.
- Documentation and software downloads available at: www.dataforth.com/maq20_download.aspx.
- Technical support via Dataforth’s engineering and customer service teams.

Maintenance:
- No routine calibration required under normal operating conditions.
- Periodic inspection recommended for wiring integrity and terminal connections.
- Firmware and configuration updates available through MAQ20 software tools.

Ordering Information:
- Model: MAQ20-FREQ
- Description: Analog Input Module; Frequency, 8-channel, 0.5Hz–1MHz range, 50mV sensitivity, DIN rail mount.

Contact Information:
Dataforth Corporation
3331 E. Hemisphere Loop, Tucson, AZ 85706 USA
Phone: +1 (800) 444-7644
Website: [www.dataforth.com](https://www.dataforth.com)

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### Summary

The Dataforth MAQ20-FREQ is a high-performance, 8-channel frequency input module engineered for precision measurement and monitoring in industrial and laboratory data acquisition systems. With a wide input range (0.5Hz–1MHz), high sensitivity (50mV), and robust isolation (1500Vrms), it provides reliable and accurate frequency data across diverse applications. Its configurable alarms, excitation outputs, and modular design make it a versatile component within the MAQ20 system architecture. Designed to meet stringent industrial standards, the MAQ20-FREQ delivers durability, accuracy, and flexibility for demanding signal acquisition environments.