1. Product Overview
Product Name: Ethernet Isolated 16 DI 36–48 V DC Module
Model: DI‑16H(FIT)
Series: FIT Series Ethernet Digital I/O Modules
Article Number: DI‑16H(FIT)
Manufacturer: Contec Co., Ltd.

The Contec DI‑16H(FIT) is an industrial‑grade Ethernet‑based digital input module designed for distributed control, monitoring, and data acquisition applications. It provides 16 isolated digital input channels supporting 36 V DC to 48 V DC logic levels, optimized for high‑voltage industrial signal environments. The module integrates robust electrical isolation, DIN‑rail mounting capability, and Ethernet communication for seamless integration into factory automation, process control, and remote I/O systems.

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2. Key Features
- 16 Isolated Digital Inputs: Each input channel supports 36 V DC to 48 V DC logic levels, suitable for industrial sensors, switches, and control signals.
- Ethernet Connectivity: Standard 10/100 Mbps Ethernet interface for remote monitoring and control over TCP/IP networks.
- Electrical Isolation: Channel‑to‑channel and channel‑to‑system isolation ensures protection against ground loops, surges, and electrical noise.
- DIN‑Rail Mounting: Compact, rugged enclosure designed for DIN‑rail installation in control cabinets and industrial panels.
- High Noise Immunity: Designed for stable operation in electrically noisy environments typical of industrial automation systems.
- Flexible Integration: Compatible with SCADA, PLC, and PC‑based control systems via standard Ethernet protocols.
- Industrial Temperature Range: Suitable for continuous operation in demanding environmental conditions.
- LED Channel Indicators: Each input channel includes a status LED for quick visual diagnostics.
- Compact Form Factor: Space‑efficient design for dense I/O installations.
- Reliable Power Supply: Operates from a 36 V DC to 48 V DC power source, matching industrial control voltage standards.

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3. Technical Specifications
- Input Channels: 16 digital inputs
- Input Type: Isolated, voltage input
- Input Voltage Range: 36 V DC to 48 V DC nominal
- Input Current: Typically 3–5 mA per channel (depending on input voltage)
- Isolation Voltage: 500 V DC or higher (channel‑to‑system and channel‑to‑channel)
- Input Logic Thresholds:
- ON level: ≥ 36 V DC
- OFF level: ≤ 10 V DC
- Response Time: Typical 1–5 ms per channel
- Communication Interface: Ethernet (10BASE‑T / 100BASE‑TX, RJ‑45 connector)
- Communication Protocols: TCP/IP, UDP, Modbus/TCP (depending on configuration)
- Power Supply: 36 V DC to 48 V DC ±10 %
- Power Consumption: Approx. 3–5 W (typical)
- Isolation Type: Photocoupler isolation between input channels and logic circuitry
- Indicators:
- Power LED (module status)
- Link/Activity LED (Ethernet status)
- 16 × Input LEDs (channel status)
- Mounting: DIN‑rail (35 mm standard)
- Enclosure Material: Industrial‑grade metal or reinforced polycarbonate housing
- Dimensions (W × D × H): Approx. 50 mm × 100 mm × 120 mm (typical)
- Weight: Approx. 250–350 g
- Operating Temperature: −10 °C to +55 °C
- Storage Temperature: −20 °C to +70 °C
- Humidity: 10 % to 90 % RH (non‑condensing)
- Vibration Resistance: 2 G, 10–55 Hz (IEC 60068‑2‑6 compliant)
- Shock Resistance: 15 G, 11 ms (IEC 60068‑2‑27 compliant)
- Protection Rating: IP20 (for control cabinet installation)

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4. Functionality
The DI‑16H(FIT) functions as a remote digital input interface that converts discrete high‑voltage signals into Ethernet‑transmittable data. Each of the 16 input channels can independently detect ON/OFF states of external devices such as limit switches, proximity sensors, push buttons, or relay contacts operating within the 36–48 V DC range.

The module continuously scans input states and transmits data to a host controller or SCADA system via Ethernet. It can be polled or configured to send updates on state changes, depending on the communication protocol used. The isolation circuitry ensures that high‑voltage transients or ground potential differences do not affect the communication or control system.

Typical Use Cases:
- Factory automation and machine control
- Process monitoring and data acquisition
- Building management systems (BMS)
- Energy management and substation monitoring
- Remote I/O expansion for PLCs and industrial PCs
- Equipment status monitoring and alarm systems

Compatibility:
The DI‑16H(FIT) is compatible with standard Ethernet‑based control architectures and can integrate with:
- Contec’s own I/O controllers and software tools
- PLCs supporting Modbus/TCP or generic TCP/IP communication
- SCADA and HMI systems for supervisory control
- Custom PC‑based applications using standard network sockets

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5. Components & Accessories
Included Items:
- DI‑16H(FIT) main module
- Removable terminal block connectors for input wiring
- DIN‑rail mounting clip or bracket
- Quick start guide or user manual
- Warranty documentation

Optional Accessories:
- Ethernet patch cables (Cat 5e/6)
- External 36–48 V DC power supply unit
- Protective terminal covers
- Panel mounting adapters
- Configuration software (if not pre‑installed)

Connectors:
- Ethernet Port: RJ‑45, 10/100 Mbps auto‑negotiation
- Power Input: 2‑pin terminal block (36–48 V DC)
- Digital Inputs: 16‑channel removable terminal block (screw or spring clamp type)
- Ground Terminal: Protective earth connection for noise suppression

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6. Installation & Setup
Requirements:
- 36–48 V DC regulated power supply
- Ethernet network connection (LAN or industrial switch)
- Control cabinet or DIN‑rail mounting location

Mounting Options:
- Standard 35 mm DIN‑rail mounting (EN 60715 compliant)
- Optional panel mounting using adapter brackets

Installation Steps:
1. Mount the module securely on the DIN‑rail.
2. Connect the 36–48 V DC power supply to the power input terminals.
3. Wire the digital input signals to the corresponding terminal block channels.
4. Connect the Ethernet port to the control network using a shielded cable.
5. Configure the IP address and communication parameters using Contec’s configuration utility or web interface.
6. Verify operation via LED indicators and test input signal response.

Configuration:
- IP address assignment (static or DHCP)
- Communication protocol selection (TCP/IP, Modbus/TCP)
- Input filtering or debounce settings (if supported)
- Diagnostic and monitoring functions accessible via web or software interface

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7. Performance & Capabilities
The DI‑16H(FIT) is engineered for high reliability and consistent performance in industrial environments. Its isolated input design ensures accurate signal detection even in the presence of electrical noise or potential differences between field devices and control systems.

Speed:
- Input response time typically within 1–5 ms, suitable for most discrete control and monitoring tasks.
- Ethernet communication latency depends on network configuration but typically remains below 10 ms for local networks.

Capacity:
- 16 independent input channels per module.
- Multiple modules can be networked to expand input capacity across distributed systems.

Efficiency:
- Low power consumption (approx. 3–5 W) minimizes heat generation and power supply load.
- Efficient isolation circuitry reduces signal interference and ensures long‑term stability.

Limitations:
- Designed for DC input signals only (36–48 V DC range).
- Not intended for direct AC signal input or analog measurement.
- Requires proper grounding and shielding for optimal noise immunity.

Reliability:
- Industrial‑grade components rated for continuous 24/7 operation.
- Mean Time Between Failures (MTBF) typically > 100,000 hours (estimated).

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8. Standards & Compliance
The DI‑16H(FIT) complies with major industrial and safety standards to ensure reliable operation and interoperability.

Electrical & Safety Standards:
- CE Marking (EMC and Low Voltage Directive compliance)
- RoHS Directive (Restriction of Hazardous Substances)
- EN 61010‑1 (Safety requirements for electrical equipment for measurement, control, and laboratory use)
- EN 61326‑1 (EMC requirements for industrial environments)

Environmental Standards:
- IEC 60068‑2‑1/2 (Temperature tests)
- IEC 60068‑2‑6 (Vibration)
- IEC 60068‑2‑27 (Shock)

Network Standards:
- IEEE 802.3 (Ethernet)
- Modbus/TCP interoperability (if configured)

Quality Assurance:
- Manufactured under ISO 9001‑certified quality management system.

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9. Additional Information
Warranty:
Typically covered by a 1‑year limited manufacturer’s warranty against defects in materials and workmanship. Extended warranty options may be available through Contec or authorized distributors.

Support:
- Technical documentation, datasheets, and user manuals available from Contec’s website.
- Firmware updates and configuration utilities provided for registered users.
- Technical support via email, phone, or online service portal.

Maintenance:
- Periodic inspection of wiring and terminal connections recommended.
- Ensure proper ventilation and avoid exposure to excessive dust or moisture.
- Firmware updates can be applied via Ethernet interface to maintain compatibility and performance.

Software & Updates:
- Configuration and monitoring software available for Windows‑based systems.
- Web‑based configuration interface accessible via standard browser.
- Firmware upgrade utility supports remote update over Ethernet.

Lifecycle & Availability:
- Designed for long‑term availability and backward compatibility within Contec’s FIT series product line.
- Replacement and spare parts available through authorized channels.

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Summary
The Contec DI‑16H(FIT) Ethernet Isolated 16 DI 36–48 V DC Module is a robust, high‑performance digital input device engineered for industrial automation and remote I/O applications. With 16 isolated input channels, Ethernet connectivity, and DIN‑rail mounting, it provides a reliable interface between high‑voltage field signals and modern networked control systems. Its combination of electrical isolation, compact design, and flexible communication options makes it ideal for distributed monitoring, machine control, and process automation environments requiring dependable digital input acquisition over Ethernet networks.