Comprehensive Product Summary – Dataforth MAQ20-MVDN

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### 1. Product Overview

Product Name: MAQ20-MVDN
Model Number: MAQ20-MVDN
Series: MAQ®20 Industrial Data Acquisition and Control System
Article Number: MAQ20-MVDN
Manufacturer: Dataforth Corporation
Manufacturer Address: 3331 E. Hemisphere Loop, Tucson, AZ 85706, USA
Website: [www.dataforth.com](http://www.dataforth.com)
Contact: techinfo@dataforth.com | Phone: +1 520-741-1404 | Toll-Free: 800-444-7644

The MAQ20-MVDN is an 8-channel, differential millivolt input module designed for high-performance industrial data acquisition and control applications. It is part of Dataforth’s modular MAQ20 system, which integrates signal conditioning, data acquisition, and control in a rugged, DIN rail-mounted architecture. The module provides precision measurement of low-level voltage signals with exceptional accuracy, isolation, and configurability, making it ideal for process monitoring, test automation, and industrial control systems.

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### 2. Key Features

- High-Accuracy Measurement: ±0.035% of span accuracy with ±0.02% linearity/conformity.
- Input Ranges: User-selectable per channel: ±50mV, ±100mV, ±250mV, ±1V, ±2V (default ±1V).
- Differential Inputs: Eight fully differential input channels for precise low-level signal measurement.
- High Isolation: 1500Vrms channel-to-bus isolation ensures signal integrity and safety.
- Input Protection: 150Vrms continuous protection against field wiring errors.
- Transient Protection: ANSI/IEEE C37.90.1 compliance for surge and transient immunity.
- Per-Channel Configuration: Each channel independently configurable for range, alarms, and averaging.
- Advanced Alarm System: Supports High, Low, High-High, and Low-Low alarms with tracking or latching modes.
- Signal Averaging: Configurable averaging weight (2⁰–2¹⁵) for noise reduction and signal stability.
- Hot-Swappable Design: Modules can be inserted or removed without system shutdown.
- Automatic Module Registration: System auto-detects and assigns registration numbers to modules.
- Wide Operating Range: -40°C to +85°C industrial temperature range.
- Compact DIN Rail Mounting: 114.6 × 82.8 × 15.3 mm form factor for high-density installations.
- Modbus-Compatible: Fully accessible via Modbus memory map for easy integration.
- CE and UL Compliance: Designed for heavy industrial environments; ATEX compliance pending.
- Software Integration: Compatible with Dataforth’s ReDAQ Shape and MAQ20 Configuration Software.

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### 3. Technical Specifications

General:
- Model: MAQ20-MVDN
- Type: 8-channel differential millivolt input module
- Mounting: DIN rail, connects to MAQ20 backbone
- Dimensions: 114.6 mm (H) × 15.3 mm (W) × 82.8 mm (D)
- Weight: Approx. 150 g (typical)
- Material: Industrial-grade polymer enclosure with ventilated housing

Electrical:
- Input Ranges: ±50mV, ±100mV, ±250mV, ±1V, ±2V (default ±1V)
- Input Type: Differential
- Input Protection: 150Vrms continuous, ANSI/IEEE C37.90.1 transient protection
- Channel-to-Bus Isolation: 1500Vrms for 1 minute
- Channel-to-Channel Isolation: ±3V peak
- Common Mode Rejection (CMR): 100dB @ 50/60Hz
- Normal Mode Rejection (NMR): 30dB @ 50/60Hz
- Accuracy: ±0.035% of span (includes linearity, hysteresis, repeatability)
- Resolution: 0.012% of span
- Zero Stability: ±15ppm/°C
- Span Stability: ±35ppm/°C
- Bandwidth: 3Hz
- Scan Rate: 20 channels per second
- Power Supply Current: 30mA typical

Environmental:
- Operating Temperature: -40°C to +85°C
- Storage Temperature: -40°C to +85°C
- Humidity: 0–95% RH, non-condensing
- Compliance: CE, UL/CUL (pending), ATEX (pending)
- EMC Standards: EN61000-6-4 (emissions), EN61000-6-2 (immunity)

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### 4. Functionality

The MAQ20-MVDN module measures low-level differential voltage signals across eight channels. Each channel can be configured independently for input range, alarm thresholds, and averaging parameters. The module digitizes analog signals and communicates data to the MAQ20-COMx communication module via the system backbone.

Use Cases:
- Precision measurement of sensor outputs (strain gauges, thermopiles, bridge sensors).
- Process monitoring in industrial automation systems.
- Laboratory and test bench data acquisition.
- Remote monitoring and control in distributed systems.

Compatibility:
- Fully compatible with MAQ20 backbones and communication modules (MAQ20-COMx).
- Integrates with ReDAQ Shape HMI software and MAQ20 Configuration Tool.
- Supports Modbus TCP/RTU for third-party SCADA and PLC integration.

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### 5. Components & Accessories

Included Components:
- MAQ20-MVDN module
- Pluggable terminal block for field wiring (20-position)
- ESD-protective packaging
- Documentation and quick start guide

Optional Accessories:
- MAQ20-BKPLx system backbones (various channel capacities)
- MAQ20-COMx communication modules (Ethernet, USB, RS-232/485)
- MAQ20-PWR3 power supply module for extended systems
- ReDAQ Shape software (MAQ20-940 Developer / MAQ20-941 User versions)
- Configuration Software Tool (MAQ20-945)
- IPEmotion software (MAQ20-952)

Connectors:
- Field I/O via pluggable terminal block
- Shield terminals connected to field-side common (isolated from bus)

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### 6. Installation & Setup

Mounting:
- DIN rail installation with snap-in mechanism.
- Align module with DIN rail, hook top edge, and rotate until it clicks into place.
- Removal via bottom clip or flat-blade screwdriver release.

System Setup:
1. Install MAQ20-BKPLx backbone on DIN rail.
2. Insert MAQ20-COMx communication module in leftmost position and apply power.
3. Insert MAQ20-MVDN and other I/O modules; system auto-registers modules.
4. Connect field wiring to terminal block.
5. Configure channels, ranges, and alarms via software or Modbus registers.

Configuration:
- Each channel’s range, averaging, and alarm parameters are set via Modbus registers.
- Range selection stored in EEPROM for persistence across power cycles.
- Channels can be enabled/disabled to optimize scan rate.

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### 7. Performance & Capabilities

Measurement Performance:
- Accuracy: ±0.035% of span
- Resolution: 0.012% of span
- Bandwidth: 3Hz (optimized for low-noise measurement)
- Scan Rate: 20 channels per second

Isolation & Protection:
- 1500Vrms channel-to-bus isolation
- 150Vrms continuous input protection
- ANSI/IEEE C37.90.1 transient protection

Alarm System:
- Four alarm types: High, Low, High-High, Low-Low
- Configurable as tracking or latching
- Adjustable deadbands to prevent false triggers
- Alarm status indicated by red LED and Modbus registers

Signal Averaging:
- Weighted averaging (2⁰–2¹⁵) per channel
- Reduces noise and stabilizes readings

Reset Functions:
- Standard Reset: Restores last saved configuration from EEPROM.
- Reset-to-Default: Returns to factory settings.
- Power-On Reset: Automatic on power cycle or brownout detection.

LED Indicators:
- PWR (Blue): Power status
- STAT (Green): Module status and detection
- TX/RX (Yellow): Communication activity
- ALM (Red): Alarm condition

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### 8. Standards & Compliance

Quality Management: ISO9001:2008 Registered QMS
Electrical Safety: UL/CUL Listing (pending), ATEX (pending)
EMC Compliance:
- EN61000-6-4 (Emission, ISM Group 1, Class A)
- EN61000-6-2 (Immunity, ISM Group 1)
- RF Performance: ±0.5% span error
- ESD/EFT Performance: Class B

Transient Protection: ANSI/IEEE C37.90.1
Environmental Rating: Heavy Industrial CE compliance

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### 9. Additional Information

Warranty:
- Hardware: 1-year limited warranty from date of delivery
- Software: 30-day warranty
- Special Products: 60-day warranty
- Covers defects in materials and workmanship under normal use.
- Excludes damage from misuse, static discharge, or operation beyond specifications.

Repair & Returns:
- Return Material Authorization (RMA) required.
- Ship prepaid to Dataforth Corporation, Tucson, AZ.
- Repair warranty: 90 days from receipt of repaired product.

Support & Maintenance:
- Technical support via phone, email, or website.
- Application engineers available for configuration and troubleshooting.
- Firmware updates and errata available online.

Safety & Usage Notes:
- Not intended for life-support or critical safety applications.
- Use proper ESD precautions during handling.
- Ensure correct grounding of shield terminals if required.

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### Summary

The Dataforth MAQ20-MVDN is a precision 8-channel differential millivolt input module engineered for industrial-grade data acquisition systems. It combines high accuracy, robust isolation, and flexible configuration in a compact DIN-rail form factor. Designed for seamless integration within the MAQ20 modular platform, it supports advanced features such as per-channel range selection, programmable alarms, and signal averaging. With its rugged design, wide operating temperature range, and compliance with industrial EMC standards, the MAQ20-MVDN delivers reliable performance in demanding environments such as manufacturing automation, process control, and laboratory instrumentation.

Its compatibility with Modbus communication and Dataforth’s ReDAQ Shape software ensures easy setup, monitoring, and integration into existing control architectures. The module’s hot-swappable capability, automatic registration, and comprehensive diagnostic indicators further enhance system maintainability and uptime, making it a cornerstone component for scalable, high-performance data acquisition systems.