Comprehensive Product Summary – Dataforth MAQ20‑ISN DIN‑Rail 16‑Channel Current Input Module

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### 1. Product Overview

Product Name: MAQ20‑ISN
Model Number: MAQ20‑ISN
Series: MAQ®20 Industrial Data Acquisition and Control System
Article Number: MAQ20‑ISN
Manufacturer: Dataforth Corporation, Tucson, Arizona, USA
Product Type: 16‑Channel Single‑Ended Current Input Module for MAQ20 System
Mounting: DIN‑Rail mount to MAQ20 backbone
Dimensions: 114.6 mm (H) × 82.8 mm (D) × 15.3 mm (W)
Weight: Approximately 100 g (typical module weight)
Documentation Reference: MA1041 MAQ20‑MVDN/‑VDN/‑VSN/‑IDN/‑ISN Hardware User Manual, Rev. B, January 2014

The MAQ20‑ISN is a high‑performance, industrial‑grade input module designed for precision current measurement in process control and data acquisition systems. It forms part of Dataforth’s modular MAQ20 platform, which integrates signal conditioning, data acquisition, and control in a rugged, distributed architecture.

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### 2. Key Features

- 16 Single‑Ended Current Input Channels: Each channel independently configurable for 0–20 mA or 4–20 mA ranges.
- High Accuracy: ±0.035 % of span typical, including linearity, hysteresis, and repeatability.
- High Isolation: 1500 Vrms channel‑to‑bus isolation for one minute; 240 Vrms continuous field I/O protection.
- Robust Protection: ANSI/IEEE C37.90.1 transient protection; 240 Vrms continuous overload tolerance.
- Wide Operating Range: −40 °C to +85 °C industrial temperature range.
- High Density: Compact 15.3 mm width allows up to 24 modules (384 channels) per 19‑inch rack width.
- Hot‑Swappable: Modules can be inserted or removed without powering down the system.
- Automatic Registration: System firmware detects installation/removal and assigns registration numbers automatically.
- Per‑Channel Configuration: Range, alarms, and averaging adjustable individually.
- Advanced Alarm Functions: High, Low, High‑High, and Low‑Low alarms with tracking or latching modes and programmable deadbands.
- Signal Averaging: Configurable exponential averaging per channel (weight = 2^x, x = 0–15).
- Modbus‑Compatible: Fully addressable via Modbus memory map; accessible through Ethernet, USB, RS‑232, or RS‑485 via MAQ20‑COMx module.
- Software Integration: Compatible with Dataforth ReDAQ Shape HMI software, MAQ20 Configuration Tool, and IPEmotion multi‑vendor platform.
- Rugged Industrial Design: Ventilated housing, ESD‑protected, and compliant with CE and ATEX (pending) standards.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Input Channels | 16 single‑ended current inputs |
| Input Ranges | 0–20 mA (default), 4–20 mA |
| Input Protection | 240 Vrms continuous, ANSI/IEEE C37.90.1 transient |
| Channel‑to‑Bus Isolation | 1500 Vrms, 1 minute |
| Channel‑to‑Channel Isolation | 0 V (single‑ended configuration) |
| Common Mode Rejection (CMR) | 100 dB @ 50/60 Hz |
| Normal Mode Rejection (NMR) | 30 dB @ 50/60 Hz |
| Accuracy | ±0.035 % of span |
| Linearity/Conformity | ±0.02 % of span |
| Resolution | 0.012 % of span |
| Zero Tempco | ±15 ppm/°C |
| Span Tempco | ±35 ppm/°C |
| Bandwidth | 3 Hz |
| Scan Rate | 200 channels per second (aggregate) |
| 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) |
| Operating Temperature | −40 °C to +85 °C |
| Storage Temperature | −40 °C to +85 °C |
| Humidity | 0–95 % RH, non‑condensing |
| EMC Compliance | EN 61000‑6‑4 (ISM Group 1, Class A emissions); EN 61000‑6‑2 (ISM Group 1 immunity) |
| Certifications | CE Compliant; UL Class I Div 2 Groups A–D pending; ATEX pending |
| Housing Material | Industrial polycarbonate enclosure with ventilation slots |
| Mounting | DIN‑rail clip with quick‑release latch |
| Weight | Approx. 100 g |

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### 4. Functionality

The MAQ20‑ISN module measures process current signals from industrial transmitters, sensors, and control loops. Each of its 16 single‑ended channels accepts either 0–20 mA or 4–20 mA inputs, selectable per channel. The module converts analog current signals into high‑resolution digital data accessible through the MAQ20 system’s Modbus memory map.

Operation Principle:
- Each channel’s input current is converted to a voltage across an internal precision resistor network.
- The signal is filtered by a low‑pass filter (3 Hz bandwidth) to reject 50/60 Hz noise.
- The conditioned signal is digitized and stored in the module’s local memory.
- Data is transmitted to the MAQ20‑COMx communication module via the system backbone.

Use Cases and Applications:
- Industrial process monitoring (pressure, flow, temperature transmitters)
- SCADA and DCS systems
- Factory automation and machine control
- Energy management and environmental monitoring
- Remote data logging and distributed I/O systems

Compatibility:
- Works with all MAQ20 backbones (MAQ20‑BKPLx)
- Communicates via MAQ20‑COMx modules (Ethernet, USB, RS‑232/485)
- Supported by Dataforth ReDAQ Shape, MAQ20 Configuration Tool, and LabVIEW VIs

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### 5. Components & Accessories

Included Items:
- MAQ20‑ISN module
- Pluggable field‑side terminal block (20‑position)
- ESD‑protective packaging
- Quick start and safety documentation

Optional Accessories:
- MAQ20‑BKPLx backbones (various channel capacities)
- 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)
- DIN‑rail mounting hardware and extension cables

Connectors:
- 20‑position pluggable terminal block for field I/O
- Shield terminals connected to field‑side common (isolated from bus)
- External shield‑to‑ground connection optional

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### 6. Installation & Setup

Mounting Procedure:
1. Orient the module with the field connector facing outward.
2. Align the top rear hook with the DIN rail.
3. Slide downward to engage the rail and snap into place.
4. To remove, depress the bottom latch or use a flat‑blade screwdriver to release.

System Integration:
- Install the MAQ20‑BKPLx backbone on the DIN rail.
- Insert the MAQ20‑COMx communication module in the leftmost slot and apply 7–34 VDC power.
- Insert the MAQ20‑ISN module into any available backbone slot.
- The system automatically registers the module and assigns a registration number.

Configuration:
- Channel range, alarms, and averaging are configured via Modbus registers or Dataforth software.
- Each module’s address space is offset by 2000 × R, where R = registration number.
- Settings can be saved to EEPROM for retention after power cycles.

Field Wiring:
- Channels 0–15 connect to terminal positions 1–20.
- Shield terminals (positions 3, 8, 13, 18) connect to field common.
- External shield‑to‑ground connection may be made if required.

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### 7. Performance & Capabilities

Measurement Performance:
- Two selectable ranges:
- Range 0: 0–20 mA (default)
- Range 1: 4–20 mA
- Over/under‑range capability: −0.5 mA to 21.5 mA measurable.
- Conversion resolution: 5.25 µA per count.
- Input counts: 0–3809 (0–20 mA), 762–3809 (4–20 mA).
- Over‑range counts: −95 to 4095.

Speed and Throughput:
- Aggregate scan rate: 200 channels per second.
- Channels can be selectively enabled to increase effective sampling rate.

Signal Conditioning:
- Hardware low‑pass filter for 50/60 Hz rejection.
- Per‑channel averaging configurable (weight = 2^x, x = 0–15).

Alarm System:
- Four alarm levels per channel: High, Low, High‑High, Low‑Low.
- Tracking or latching modes selectable.
- Programmable deadbands prevent false triggering.
- Alarm status indicated by red ALM LED and Modbus registers.

Reliability and Isolation:
- Over‑range on one channel does not affect others.
- 1500 Vrms isolation ensures signal integrity.
- Watchdog and brown‑out detection with automatic reset.

Limitations:
- Single‑ended inputs share a common return; not suitable for differential current loops.
- Bandwidth limited to 3 Hz for noise immunity; not intended for high‑frequency signals.

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### 8. Standards & Compliance

- Quality System: ISO 9001:2008‑registered QMS
- Electrical Safety: 1500 Vrms isolation, 240 Vrms continuous protection
- EMC Compliance:
- EN 61000‑6‑4 (Emission, ISM Group 1 Class A)
- EN 61000‑6‑2 (Immunity, ISM Group 1)
- RF Performance A (±0.5 % span error)
- ESD/EFT Performance B
- Environmental: −40 °C to +85 °C operation, 95 % RH non‑condensing
- Certifications: CE marked; UL Class I Div 2 Groups A–D pending; ATEX pending
- Transient Protection: ANSI/IEEE C37.90.1
- Hazardous Location Rating: Designed for Class I Division 2 hazardous areas

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### 9. Additional Information

Warranty:
- Hardware: 1 year from date of delivery.
- Software: 30 days from delivery.
- Special Products: 60 days.
- Warranty covers defects in materials and workmanship; excludes misuse, over‑stress, or static damage.
- 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
- Include model number, serial number, contact details, and purchase order for out‑of‑warranty repairs.

Support & Resources:
- Technical Support: techinfo@dataforth.com
- Website: [www.dataforth.com](https://www.dataforth.com)
- Manuals: MA1041 Hardware User Manual, MA1036 Quick Start Guide, MA1037 Configuration Tool Manual, MA1038 ReDAQ Shape Manual.
- Software: ReDAQ Shape Developer (‑940) and User (‑941) versions; MAQ20 Configuration Tool (‑945); IPEmotion (‑952).

Maintenance:
- Modules are hot‑swappable; replacement requires no system shutdown.
- Periodic inspection for secure DIN‑rail mounting and connector integrity recommended.
- Firmware updates available via Dataforth website.

LED Indicators:
- PWR (Blue): Power ON indicator.
- STAT (Green): Normal operation (1 Hz blink); 5 Hz blink for Module Detect.
- TX/RX (Yellow): Communication activity.
- ALM (Red): Alarm condition active.

Reset Functions:
- Standard Reset: Clears status and diagnostic registers; retains EEPROM settings.
- Reset‑to‑Default: Restores factory defaults (except EEPROM).
- Power‑On Reset: Automatic on power cycle or brown‑out event.

Safety & Handling:
- Modules shipped in ESD‑protective packaging; use proper grounding during installation.
- Not intended for life‑support or critical safety applications.

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### Summary

The Dataforth MAQ20‑ISN is a precision 16‑channel single‑ended current input module engineered for demanding industrial data acquisition and control environments. It provides high accuracy, robust isolation, and flexible configuration within the modular MAQ20 platform. With per‑channel programmability, advanced alarm management, and seamless Modbus integration, the MAQ20‑ISN delivers reliable performance for process monitoring, automation, and distributed control systems. Its rugged design, wide temperature tolerance, and compliance with industrial EMC and safety standards make it suitable for deployment in harsh environments where measurement integrity and system uptime are critical.