Comprehensive Product Summary – SUNIX SM_UI_108i Universal Analog Input Module

---

### 1. Product Overview

Product Name: 8 DI AD Universal Input Module
Model: SM_UI_108i
Series: SUNIX ioSCADA SM Series
Article Number: SM_UI_108i
Manufacturer: Sunix Group

The SM_UI_108i is a high-performance 8-channel universal analog input module designed for industrial automation and SCADA applications. It belongs to the SUNIX ioSCADA SM series, a family of modular, DIN-rail-mounted I/O devices supporting Modbus RTU and ASCII protocols over RS-485 communication. The module provides 8 differential analog input channels capable of measuring current, voltage, and thermocouple signals with high precision and robust isolation, making it suitable for harsh industrial environments such as power plants, steel manufacturing, and petrochemical facilities.

---

### 2. Key Features

- Universal Input Capability:
Supports multiple signal types per channel, including ±20 mA, 4–20 mA, ±10 V, ±5 V, 1–5 V, ±100 mV, ±500 mV, and thermocouple types J, K, T, R, S, E, B, N.
Each channel can be configured independently via software.

- High Resolution and Accuracy:
16-bit A/D conversion (1 part in 32,000) for voltage/current inputs and 0.1°C resolution for thermocouple inputs.
Accuracy: ±0.05% of input range at 25°C.

- Advanced Isolation Protection:
Three-way isolation: RS-485 to logic, field to logic, and channel-to-channel, each rated at 3000 Vrms.
Ensures high noise immunity and protection against ground loops.

- Industrial-Grade Reliability:
Designed for -30°C to +75°C operation, with IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 compliance.
Built-in hardware watchdog for system stability.

- External Cold-Junction Compensation:
Enhances thermocouple measurement accuracy by compensating for terminal temperature variations.

- Comprehensive Alarm and Diagnostic Functions:
Includes high/low alarms, over/under range, overflow/underflow, and break detection for thermocouples.

- Flexible Configuration:
DIP switches for baud rate, Modbus address, and protocol selection (RTU/ASCII).
Software configuration via ioCFG Windows utility.

- Modbus Compatibility:
Fully compliant with Modbus RTU/ASCII standards, supporting function codes 01–17.
Compatible with major SCADA software such as LabView, Wonderware, Citect, and Intellution.

- User-Friendly Design:
DIN-rail mountable with slide-out labeling panel, status LEDs, and pull-out terminal blocks for easy wiring and maintenance.

---

### 3. Technical Specifications

Input Channels: 8 differential
Input Types:
- Current: ±20 mA, 4–20 mA
- Voltage: ±10 V, ±5 V, 1–5 V, ±100 mV, ±500 mV
- Thermocouple: J, K, T, R, S, E, B, N

Resolution:
- Analog: 16-bit (1 part in 32,000)
- Thermocouple: 0.1°C (0.18°F)

Accuracy: ±0.05% of input range @ 25°C
Temperature Coefficient: ±0.005% of span/°C or ±1.0 µV/°C

Input Impedance:
- Voltage/mV: 100 kΩ
- Current: 250 Ω
- Thermocouple: 20 MΩ

Conversion Rate: 140 ms per channel
Input Filter Bandwidth: -3 dB at 1.5 Hz
Noise Rejection: 60 dB (normal mode), 88 dB (common mode) @ 60 Hz
Overvoltage Protection: ±60 V AC (voltage inputs)
Overcurrent Protection: 300 mA (current inputs)
Thermocouple Overvoltage Protection: ±15 V

Cold Junction Compensation: External sensor included
Reference Junction Accuracy: ±0.15°C (0–70°C), ±0.5°C (-20–0°C)

Isolation Voltage: 3000 Vrms (RS-485, field-to-logic, channel-to-channel)
Power Supply: 10–30 VDC
Power Consumption: Typical 0.1227 A @ 24 VDC

Dimensions: 132 × 125 × 47.5 mm
Mounting: DIN-rail or panel mount
Weight: Approx. 0.5 kg

Operating Temperature: -30°C to +75°C
Storage Temperature: -45°C to +85°C
Humidity: 5–90% RH, non-condensing

---

### 4. Functionality

The SM_UI_108i functions as a universal analog input interface for industrial control systems. Each of its eight channels can independently measure current, voltage, or thermocouple signals. The module digitizes analog signals using a 16-bit ADC and transmits data via RS-485 using Modbus RTU or ASCII protocol.

Use Cases and Applications:
- Industrial process monitoring (temperature, pressure, flow, voltage, current)
- SCADA and DCS data acquisition
- Remote I/O for PLCs and PACs
- Energy management and environmental monitoring
- Steel, petrochemical, and power generation industries

Compatibility:
Works seamlessly with Modbus-compatible controllers and SCADA software.
Supports up to 63 modules on a single RS-485 network (up to 4000 ft without repeater).

---

### 5. Components & Accessories

Included Items:
- SM_UI_108i module
- DIN-rail mounting kit
- Installation CD with ioCFG configuration software
- Quick installation guide
- External cold-junction compensation wiring (for thermocouple inputs)

Optional Accessories:
- RS-232/RS-485 isolation converter
- RS-485 repeater (for extended networks)
- Panel mounting brackets

Connectors:
Removable terminal blocks for power, communication, and I/O channels (16–24 AWG wire supported).

---

### 6. Installation & Setup

Requirements:
- Power supply: 10–30 VDC (24 VDC recommended)
- Host system: PC, PLC, PAC, or DCS with Modbus RTU/ASCII support
- Communication: RS-485 (3-wire: Data+, Data–, COM)

Mounting Options:
- DIN-rail (horizontal or vertical orientation)
- Panel mounting with included accessories

Configuration:
- DIP switches for baud rate (1200–115.2 kbps), address (1–63), and protocol selection (RTU/ASCII).
- Software configuration via ioCFG utility for channel type, scaling, alarms, and smoothing.

LED Indicators:
- PWR: Power status
- RX/TX: Communication activity
- IO_ACC: Module operation status
- Rt_ON: RS-485 termination resistor status

Network Setup:
- Up to 63 modules per RS-485 segment
- Maximum cable length: 4000 ft (1200 m) without repeater
- Termination resistor enabled for end-of-line modules

Reset to Factory Defaults:
- DIP switch 7 (INIT) procedure allows restoring default settings.

---

### 7. Performance & Capabilities

Speed and Conversion:
Each channel converts analog signals at 140 ms per channel, ensuring real-time data acquisition for SCADA systems.

Capacity:
8 fully isolated differential channels, each configurable for different signal types.

Efficiency and Reliability:
- Automatic self-calibration minimizes temperature drift.
- Hardware watchdog ensures continuous operation even under communication loss.
- High noise immunity (EFT/ESD/Surge compliant).

Limitations:
- Not suitable for human life-support or safety-critical applications.
- Requires external cold-junction sensor for optimal thermocouple accuracy.

---

### 8. Standards & Compliance

Communication Protocol:
- Modbus RTU/ASCII over RS-485 (3-wire)
- Supported baud rates: 1200, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k bps
- Data format: 8 data bits, no parity, 1 stop bit

Supported Modbus Function Codes:
01 – Read Coil Status
02 – Read Input Status
03 – Read Holding Registers
04 – Read Input Registers
05 – Force Single Coil
06 – Preset Single Register
08 – Loopback Command
15 – Force Multiple Coils
16 – Preset Multiple Registers
17 – Report Slave ID

Electrical and Environmental Compliance:
- CE Certified
- EFT Immunity: IEC61000-4-4 Level 3 (power/signal lines)
- ESD Immunity: IEC61000-4-2 Level 3 (8 kV air, 4 kV contact)
- Surge Immunity: IEC61000-4-5 (0.5 kV)
- Isolation Voltage: 3000 Vrms (RS-485, field-to-logic, channel-to-channel)

Safety and Reliability:
- Dual watchdog (hardware and communication)
- Overvoltage protection: 70 VDC/Vp-p
- Overcurrent protection: 300 mA

---

### 9. Additional Information

Warranty:
- 2 years from delivery or 1 year after installation, whichever comes first.
- Covers manufacturing defects under normal operation.
- Excludes damage from misuse, improper installation, or environmental conditions beyond specifications.

Support & Service Policy:
- Free repair, testing, and adjustment during warranty period (shipping costs borne by customer).
- Post-warranty repairs available at approximately 25% of product price.
- RMA (Return Material Authorization) required for all returns.
- Customer must provide RMA code, company details, problem description, and contact information.

Maintenance:
- Periodic inspection of wiring and terminal connections recommended.
- Keep module in a dry, dust-free environment.
- Use only certified power supplies conforming to IEC-61000-4-4 standards.

Software & Updates:
- Configuration via ioCFG Windows utility (compatible with Windows XP and later).
- Supports firmware updates via Modbus communication.
- ioCFG allows real-time monitoring, parameter adjustment, and EEPROM data storage.

Physical Design:
- Compact industrial-grade enclosure with pull-out labeling panel.
- Independent terminal blocks for power, communication, and I/O simplify maintenance.
- LED indicators provide immediate visual feedback of system status.

Power Consumption:
- Typical: 0.1227 A @ 24 VDC
- Minimum: 0.1038 A @ 30 VDC
- Maximum: 0.2276 A @ 10 VDC

Network Expansion:
- Supports up to 63 nodes per RS-485 segment without repeater.
- Extendable with RS-485 repeaters for larger installations.

---

### Summary

The SUNIX SM_UI_108i Universal Analog Input Module is a versatile, high-precision data acquisition device engineered for industrial automation and SCADA systems. Its ability to handle multiple analog signal types—including current, voltage, and thermocouple inputs—makes it a flexible solution for diverse monitoring and control applications. With robust isolation, wide operating temperature range, and compliance with industrial EMC standards, the SM_UI_108i ensures reliable performance in demanding environments.

Its Modbus RTU/ASCII compatibility, user-friendly configuration tools, and modular design make it ideal for integration into distributed control systems, providing accurate, stable, and noise-immune analog data acquisition for modern industrial networks.