Comprehensive Product Summary – Dataforth MAQ20‑VDN DIN‑Rail 8‑Channel Voltage Input Module

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### 1. Product Overview

Product Name: MAQ20‑VDN
Model Number: MAQ20‑VDN
Series: MAQ20® Industrial Data Acquisition and Control System
Article Number: MAQ20‑VDN
Manufacturer: Dataforth Corporation, Tucson, Arizona, USA
Product Type: 8‑Channel Differential Voltage Input Module for DIN‑Rail Mounting
System Compatibility: MAQ20® modular data acquisition and control platform

The MAQ20‑VDN is a high‑performance, industrial‑grade voltage input module designed for precision data acquisition in distributed control and monitoring systems. It is part of Dataforth’s MAQ20® family of modular I/O and communication components, engineered for rugged industrial environments and compliant with international standards for safety, EMC, and reliability.

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### 2. Key Features

- Eight Differential Voltage Input Channels: Each channel independently configurable for input range, alarms, and averaging.
- Selectable Input Ranges: ±5 V, ±10 V, ±20 V, ±40 V, ±60 V (default ±5 V).
- High Accuracy: ±0.035 % of span typical, including linearity, hysteresis, and repeatability.
- High Isolation: 1500 Vrms channel‑to‑bus isolation; 240 Vrms continuous field I/O protection.
- Robust Protection: ANSI/IEEE C37.90.1 transient protection; 240 Vrms continuous overload per channel.
- Independent Channel Operation: Over‑range on one channel does not affect others.
- Wide Operating Temperature: −40 °C to +85 °C industrial range.
- Low Temperature Coefficients: Zero ±15 ppm/°C; Span ±35 ppm/°C.
- High Common‑Mode Rejection: 100 dB @ 50/60 Hz; Normal‑Mode Rejection 30 dB @ 50/60 Hz.
- Signal Averaging and Filtering: Hardware low‑pass filtering for 50/60 Hz noise rejection; configurable digital averaging.
- Advanced Alarm Functions: High, Low, High‑High, and Low‑Low alarms with tracking or latching modes and programmable deadbands.
- Hot‑Swappable Module: Field‑side pluggable terminal block allows replacement without system downtime.
- Distributed Processing: Each module performs local data acquisition and processing, reducing system load.
- Modbus‑Compatible Memory Map: Simplifies integration with SCADA, PLC, and HMI systems.
- Automatic Module Registration: Plug‑and‑play detection and address assignment within the MAQ20 backbone.
- CE, UL/CUL, and ATEX Compliance (pending): Designed for Class I, Division 2 hazardous locations.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Input Channels | 8 differential voltage inputs |
| Input Ranges | ±5 V, ±10 V, ±20 V, ±40 V, ±60 V (default ±5 V) |
| Input Protection | 240 Vrms continuous; ANSI/IEEE C37.90.1 transient |
| Channel‑to‑Bus Isolation | 1500 Vrms, 1 minute |
| Channel‑to‑Channel Isolation | ±28 V peak |
| Accuracy | ±0.035 % span |
| Linearity/Conformity | ±0.02 % span |
| Resolution | 0.012 % span |
| Zero Tempco | ±15 ppm/°C |
| Span Tempco | ±35 ppm/°C |
| Bandwidth | 3 Hz |
| Scan Rate | 20 channels/s (MAQ20‑VDN) |
| Common‑Mode Rejection (CMR) | 100 dB @ 50/60 Hz |
| Normal‑Mode Rejection (NMR) | 30 dB @ 50/60 Hz |
| Power Supply Current | 30 mA typical |
| Dimensions (H × W × D) | 114.6 mm × 15.3 mm × 82.8 mm (4.51 × 0.60 × 3.26 in) |
| Weight | Approx. 120 g |
| Operating Temperature | −40 °C to +85 °C |
| Storage Temperature | −40 °C to +85 °C |
| Humidity | 0–95 % RH, non‑condensing |
| EMC Emissions | EN 61000‑6‑4 (ISM Group 1, Class A) |
| EMC Immunity | EN 61000‑6‑2 (ISM Group 1, Performance A/B) |
| Certifications | CE, UL Class I Div 2 Groups A–D (pending), ATEX (pending) |

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### 4. Functionality

The MAQ20‑VDN module converts differential analog voltage signals into digital data for acquisition and control applications. Each channel can be configured individually for range, alarms, and averaging. The module communicates with the MAQ20‑COMx communication module via the system backbone, which distributes both power and data.

Operation Principle:
- Analog inputs are sampled and digitized with high precision.
- Each channel’s configuration (range, averaging, alarms) is stored in non‑volatile memory.
- Data is accessible via Modbus registers; the system supports real‑time monitoring and logging.
- Hardware filtering and digital averaging minimize noise and improve signal stability.

Typical Applications:
- Industrial process monitoring and control
- Power system voltage measurement
- Laboratory instrumentation and test benches
- SCADA and DCS integration
- Remote data logging and condition monitoring

Compatibility:
- Fully compatible with MAQ20‑COMx communication modules (Ethernet, USB, RS‑232/485).
- Works with MAQ20‑BKPLx backbones and MAQ20‑PWR3 power supply modules.
- Supported by Dataforth ReDAQ Shape and MAQ20 Configuration Software.

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### 5. Components & Accessories

Included:
- MAQ20‑VDN module
- Pluggable 20‑position terminal block for field wiring
- ESD‑safe packaging and documentation

Optional Accessories:
- MAQ20‑BKPLx system backbones (various slot counts)
- MAQ20‑COMx communication modules
- MAQ20‑PWR3 auxiliary power supply module
- ReDAQ Shape Software (MAQ20‑940/941)
- Configuration Software Tool (MAQ20‑945)
- IPEmotion Software (MAQ20‑952)

Connectors:
- 20‑position pluggable terminal block
- Shield terminals tied to field‑side common (isolated from bus)

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### 6. Installation & Setup

Mounting:
- DIN‑rail mountable; designed for quick insertion and removal.
- Compatible with standard 35 mm DIN rails mounted on flat panels or plates.
- Modules can be stacked vertically in 3U increments.

Installation Steps:
1. Mount MAQ20‑BKPLx backbone on DIN rail.
2. Insert MAQ20‑COMx communication module in the leftmost slot and apply power (7–34 V DC).
3. Insert MAQ20‑VDN module into any available slot; automatic registration occurs within 1 s.
4. Connect field wiring to the terminal block following channel pinout.
5. Configure channels using MAQ20 Configuration Software or Modbus commands.

Channel Connections (Top → Bottom):
1 CH0 +IN 2 CH0 −IN 3 Shield 4 CH1 +IN 5 CH1 −IN 6 CH2 +IN 7 CH2 −IN 8 Shield 9 CH3 +IN 10 CH3 −IN 11 CH4 +IN 12 CH4 −IN 13 Shield 14 CH5 +IN 15 CH5 −IN 16 CH6 +IN 17 CH6 −IN 18 Shield 19 CH7 +IN 20 CH7 −IN

Configuration:
- Input range, averaging, and alarms are set via Modbus registers or software tools.
- Channel enable/disable allows optimization of scan rate.
- Settings can be saved to EEPROM for retention after power cycles.

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### 7. Performance & Capabilities

- Sampling Rate: 20 channels/s for the 8‑channel differential module.
- Data Resolution: 12‑bit equivalent (±4096 counts).
- Signal Averaging: Configurable weighting (2⁰ to 2¹⁵) per channel.
- Alarm Processing: Real‑time evaluation of up to four thresholds per channel.
- Data Logging: Up to 4 GB of logged data transferable via FTP when used with MAQ20‑COMx.
- System Expansion: Up to 24 I/O modules (384 channels) per system.
- Hot‑Swap Capability: Modules can be replaced without system shutdown.
- Isolation Integrity: Over‑range or fault on one channel does not affect others.
- Limitations: Bandwidth limited to 3 Hz; not intended for high‑frequency transient capture.

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### 8. Standards & Compliance

- Quality Management: ISO 9001:2008‑registered QMS.
- Safety: Designed for Class I Division 2 Groups A, B, C, D hazardous locations (pending UL/ATEX).
- EMC Compliance:
- EN 61000‑6‑4 (Emission, ISM Group 1 Class A)
- EN 61000‑6‑2 (Immunity, ISM Group 1 Performance A/B)
- Transient Protection: ANSI/IEEE C37.90.1.
- Environmental: Heavy Industrial CE compliance.
- Electrical: 7–34 V DC system power range.

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### 9. Additional Information

Warranty:
- Standard hardware warranty: 1 year from date of delivery.
- Software warranty: 30 days from delivery.
- Special products: 60 days.
- Warranty covers defects in materials and workmanship; excludes misuse, over‑stress, or improper handling.
- Returns require a Return Material Authorization (RMA) number.

Repair & Returns:
- Contact Dataforth Customer Service at +1 520‑741‑1404 or 800‑444‑7644.
- Ship prepaid to:
Dataforth Corporation
3331 E. Hemisphere Loop, Tucson, AZ 85706 USA

Support & Maintenance:
- Technical support via techinfo@dataforth.com.
- Software updates and errata available at [www.dataforth.com](https://www.dataforth.com).
- Modules are maintenance‑free; periodic inspection of wiring and DIN‑rail connections recommended.

LED Indicators:
- PWR (Blue): Power ON = normal; OFF = no power.
- STAT (Green): 1 Hz blink = normal; 5 Hz blink = module detect; steady = fault.
- TX/RX (Yellow): Blink = active communication; OFF = no data exchange.
- ALM (Red): Lit = alarm condition active.

Reset Functions:
- Standard Reset: Clears alarms, resets min/max/average registers.
- Reset‑to‑Default: Restores factory settings (except EEPROM).
- Power‑On Reset/Brownout: Automatic standard reset on power cycle.

Module Identification:
- Model, serial number, date code, and firmware revision stored in registers 0–44.
- “Module Detect” command blinks STAT LED at 5 Hz for 5 s for visual identification.

Software Integration:
- ReDAQ Shape (MAQ20‑940/941): Graphical HMI design and runtime environment.
- MAQ20 Configuration Tool (MAQ20‑945): Parameter setup and register management.
- IPEmotion (MAQ20‑952): Multi‑vendor data acquisition software support.
- LabVIEW VIs and programming examples available for custom integration.

Manufacturer Profile:
Dataforth Corporation, founded in Tucson, Arizona, is a global leader in industrial signal conditioning, data acquisition, and communication solutions. With over 25 years of experience and ISO 9001:2008 certification, Dataforth products are renowned for ruggedness, precision, and long‑term reliability in industrial automation and process control applications.

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### Summary

The Dataforth MAQ20‑VDN is a precision 8‑channel differential voltage input module engineered for demanding industrial data acquisition systems. It offers exceptional accuracy, isolation, and configurability within the modular MAQ20 platform. With per‑channel range selection, advanced alarm management, and robust protection features, the MAQ20‑VDN ensures reliable measurement of analog voltages up to ±60 V in harsh environments. Its DIN‑rail form factor, hot‑swappable design, and Modbus‑compatible architecture make it ideal for scalable, distributed control systems requiring high‑integrity signal acquisition and long‑term operational stability.