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- Eight Relay Outputs: Provides 8 Form A (normally open) relay channels for switching AC or DC loads.
- High Load Capacity: Each relay supports up to 5A at 250VAC or 30VDC, suitable for controlling solenoids, contactors, and other actuators.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire), ensuring interoperability with SCADA, PLC, and DCS systems.
- High-Speed Communication: Baud rates selectable from 1200 to 115.2 kbps (default 115.2 kbps).
- Addressable Network: Supports up to 63 modules on a single RS-485 bus without a repeater, with a maximum network distance of 4000 feet (1200 meters).
- 3-Way Isolation Protection: Provides 3000 Vrms isolation between RS-485, logic, and field sides, plus channel-to-channel isolation for enhanced safety and noise immunity.
- Dual Watchdog System: Hardware and communication watchdogs ensure continuous operation and fail-safe output states in case of communication loss.
- User-Friendly LED Indicators: LEDs display power, communication (RX/TX), I/O status, and terminal resistor activation for easy diagnostics.
- DIN-Rail Mounting: Compact industrial housing (132 × 125 × 47.5 mm) designed for DIN-rail installation, with slide-out labeling for easy maintenance.
- Wide Operating Temperature Range: Operates reliably from -30°C to +75°C, suitable for demanding industrial environments.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication failure conditions.
- TPC (Time Proportion Control): Converts analog percentage values (0–100%) into digital pulse-width outputs for process control applications.
- Software-Free Configuration: DIP switches allow setting of baud rate, Modbus address, and protocol type without requiring configuration software.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Reset to Factory Defaults: DIP switch function allows quick restoration of default settings.
- High Load Capacity: Each relay supports up to 5A at 250VAC or 30VDC, suitable for controlling solenoids, contactors, and other actuators.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire), ensuring interoperability with SCADA, PLC, and DCS systems.
- High-Speed Communication: Baud rates selectable from 1200 to 115.2 kbps (default 115.2 kbps).
- Addressable Network: Supports up to 63 modules on a single RS-485 bus without a repeater, with a maximum network distance of 4000 feet (1200 meters).
- 3-Way Isolation Protection: Provides 3000 Vrms isolation between RS-485, logic, and field sides, plus channel-to-channel isolation for enhanced safety and noise immunity.
- Dual Watchdog System: Hardware and communication watchdogs ensure continuous operation and fail-safe output states in case of communication loss.
- User-Friendly LED Indicators: LEDs display power, communication (RX/TX), I/O status, and terminal resistor activation for easy diagnostics.
- DIN-Rail Mounting: Compact industrial housing (132 × 125 × 47.5 mm) designed for DIN-rail installation, with slide-out labeling for easy maintenance.
- Wide Operating Temperature Range: Operates reliably from -30°C to +75°C, suitable for demanding industrial environments.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication failure conditions.
- TPC (Time Proportion Control): Converts analog percentage values (0–100%) into digital pulse-width outputs for process control applications.
- Software-Free Configuration: DIP switches allow setting of baud rate, Modbus address, and protocol type without requiring configuration software.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Reset to Factory Defaults: DIP switch function allows quick restoration of default settings.
1. Product Overview
Product Name: 8-Channel Relay Output Module
Model: SM_DO_108
Series: SUNIX ioSCADA SM Series
Article Number: SM_DO_108
Manufacturer: Sunix Group
The SM_DO_108 is an industrial-grade relay output module designed for distributed control and data acquisition systems. It is part of the SUNIX ioSCADA SM series, a family of Modbus I/O modules engineered for SCADA, DCS, and PLC applications. The module provides eight independent relay outputs with Form A (normally open) contacts, supporting both AC and DC loads. It communicates via the RS-485 interface using standard Modbus RTU or ASCII protocols, ensuring compatibility with most industrial automation systems. The SM_DO_108 is built for harsh industrial environments, offering high noise immunity, 3-way isolation, and robust watchdog protection for both hardware and communication.
2. Key Features
- Eight Relay Outputs: Provides 8 Form A (normally open) relay channels for switching AC or DC loads.
- High Load Capacity: Each relay supports up to 5A at 250VAC or 30VDC, suitable for controlling solenoids, contactors, and other actuators.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire), ensuring interoperability with SCADA, PLC, and DCS systems.
- High-Speed Communication: Baud rates selectable from 1200 to 115.2 kbps (default 115.2 kbps).
- Addressable Network: Supports up to 63 modules on a single RS-485 bus without a repeater, with a maximum network distance of 4000 feet (1200 meters).
- 3-Way Isolation Protection: Provides 3000 Vrms isolation between RS-485, logic, and field sides, plus channel-to-channel isolation for enhanced safety and noise immunity.
- Dual Watchdog System: Hardware and communication watchdogs ensure continuous operation and fail-safe output states in case of communication loss.
- User-Friendly LED Indicators: LEDs display power, communication (RX/TX), I/O status, and terminal resistor activation for easy diagnostics.
- DIN-Rail Mounting: Compact industrial housing (132 × 125 × 47.5 mm) designed for DIN-rail installation, with slide-out labeling for easy maintenance.
- Wide Operating Temperature Range: Operates reliably from -30°C to +75°C, suitable for demanding industrial environments.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication failure conditions.
- TPC (Time Proportion Control): Converts analog percentage values (0–100%) into digital pulse-width outputs for process control applications.
- Software-Free Configuration: DIP switches allow setting of baud rate, Modbus address, and protocol type without requiring configuration software.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Reset to Factory Defaults: DIP switch function allows quick restoration of default settings.
3. Technical Specifications
- Output Channels: 8 relay outputs
- Relay Type: Form A (normally open)
- Contact Rating: 5A @ 250VAC / 5A @ 30VDC
- Maximum Output Current per Channel: 2A
- Minimum OFF Resistance: 1000 MΩ @ 500VDC
- Minimum ON Resistance: 30 mΩ @ 6VDC, 1A
- Output Response Time: ≤10 ms (from command receipt to relay activation)
- Mechanical Life: 2 × 10⁷ operations
- Electrical Life: 1 × 10⁵ operations at 1A load
- Line Voltage: Maximum 250VAC or 30VDC
- Power Supply: 10–30 VDC (typical 24VDC)
- Power Consumption: 0.1094A @ 24VDC (typical), 0.2687A max @ 10VDC
- Isolation Voltage: 3000 Vrms (RS-485 to logic and field sides)
- Network Isolation Voltage: 3 kV
- Overvoltage Protection: 70 VDC/Vp-p
- Dimensions: 132 × 125 × 47.5 mm
- Mounting: DIN-rail
- Wiring: I/O cable 16–24 AWG
- Operating Temperature: -30°C to +75°C
- Storage Temperature: -45°C to +85°C
- Relative Humidity: 5–90%, non-condensing
- Enclosure: Industrial-grade plastic housing
4. Functionality
The SM_DO_108 functions as a Modbus slave device on an RS-485 network, providing eight independent relay outputs that can be controlled remotely by a Modbus master such as a PLC, DCS, or SCADA system. Each output can be individually configured for direct switching, delayed activation, pulse output, or time-proportion control. The module supports both Modbus RTU and ASCII modes, selectable via DIP switch, and can operate at baud rates up to 115.2 kbps.
Use Cases and Applications:
- Industrial automation and process control
- SCADA and DCS remote I/O expansion
- Building automation and HVAC control
- Energy management and power distribution systems
- Machine control and safety interlocking
- Environmental monitoring and utility management
Compatibility:
Fully compatible with standard Modbus-based SCADA software such as LabView, Wonderware, Citect, and Intellution. It can also interface with PLCs and PACs from various manufacturers supporting Modbus RTU/ASCII.
5. Components & Accessories
Included Items:
- SM_DO_108 module
- DIN-rail mounting accessory
- Installation CD with ioCFG configuration utility
- Quick installation guide
Optional Accessories:
- RS-232/RS-485 isolation converter (for PCs without RS-485 ports)
- RS-485 repeater (for networks exceeding 1200 m)
- Panel mounting kit
Connectors:
- Removable terminal blocks for power, communication, and I/O
- RS-485 terminals: Data+, Data-, COM
- Power terminals: +VDC, GND
6. Installation & Setup
Requirements:
- Power supply: 10–30 VDC (industrial-grade, IEC61000-4-4 compliant)
- Host system: SCADA PC, PLC, PAC, or DCS with RS-485 interface
- Communication cable: Shielded twisted pair (EIA RS-485 standard)
Mounting Options:
- DIN-rail (horizontal or vertical orientation)
- Panel mounting (optional accessory)
Configuration:
- DIP Switch SW-1: Sets baud rate (1200–115200 bps) and protocol (RTU/ASCII)
- DIP Switch SW-2: Sets Modbus slave address (1–63) and factory reset (INIT)
- Factory Reset Procedure:
1. Power off the module
2. Set SW-2 DIP7 to ON
3. Power on the module
4. Return DIP7 to OFF within 5 seconds
LED Indicators:
- PWR: Power status
- RX/TX: Communication activity
- IO_ACC: I/O operation status
- Rt_ON: RS-485 terminal resistor enabled
Communication Parameters:
- Data bits: 8
- Parity: None
- Stop bits: 1
- Default baud rate: 115.2 kbps
- Default address: 1
Network Topology:
- Up to 63 modules per RS-485 segment
- Maximum cable length: 4000 feet (1200 m) without repeater
- Termination resistor enabled at network endpoints
7. Performance & Capabilities
- Relay Switching Speed: ≤10 ms response time
- Load Capacity: 5A per channel (AC/DC)
- Total Module Current: 8A maximum
- Communication Speed: Up to 115.2 kbps
- Network Capacity: 63 nodes per RS-485 segment
- Isolation: 3-way, 3000 Vrms
- Reliability: MTBF optimized for industrial environments
- Fail-Safe Operation: Outputs revert to predefined safe states upon communication loss
- Timer Functions:
- Output ON delay: 0–65535 s (1 s resolution)
- Output OFF delay: 0–65535 s (1 s resolution)
- Pulse output duration: 0–65535 s
- TPC duty cycle: 1–3000 (0.1–300 s)
- Fail-safe timeout: 0–65535 s
- Timer Accuracy: ±1%
Limitations:
- Maximum switching voltage: 250VAC or 30VDC
- Maximum current per channel: 2A continuous
- Not suitable for human safety or life-support applications
8. Standards & Compliance
Communication Standards:
- Modbus RTU/ASCII over RS-485 (3-wire)
- Supports Modbus function codes: 1, 2, 3, 4, 5, 6, 8, 15, 16, 17
Electrical & Environmental Compliance:
- EFT Immunity: IEC61000-4-4 Level 3 (power and signal lines)
- ESD Immunity: IEC61000-4-2 Level 3 (8 kV air, 4 kV contact)
- Surge Immunity: IEC61000-4-5 (0.5 kV)
- CE Compliant
Isolation & Protection:
- RS-485 isolation: 3000 Vrms
- Field-to-logic isolation: 3000 Vrms
- Channel-to-channel isolation: Yes
- Overvoltage protection: 70 VDC/Vp-p
Safety & Reliability:
- Dual watchdog (hardware and communication)
- Nonvolatile memory for configuration retention
- Reset-to-default capability
9. Additional Information
Warranty & Service Policy:
- Warranty Period: 2 years from delivery or 1 year after installation (whichever comes first)
- Coverage: Manufacturing defects under normal operating conditions
- Exclusions: Damage due to improper installation, misuse, or environmental conditions beyond specifications
- Repair Policy: Free repair during warranty period (shipping costs borne by customer); post-warranty repairs charged at ~25% of product price
- RMA Procedure: Requires authorization code, problem description, and proof of purchase
Maintenance:
- Periodic inspection of terminal connections and relay contacts recommended
- Ensure proper grounding and shielding of RS-485 network
- Replace fuses if overcurrent protection is triggered
Software & Updates:
- Configuration Utility: ioCFG (Windows-based) for monitoring and parameter setup
- Firmware Updates: Available through Sunix technical support
- Compatibility: Requires Windows XP or later with .NET Framework 2.0 or higher
Support Resources:
- Technical documentation and Modbus register maps included on installation CD
- Online resources and Modbus protocol references available at [www.modbus.org](http://www.modbus.org)
Summary
The Sunix SM_DO_108 is a robust, high-performance 8-channel relay output module engineered for industrial automation and SCADA systems. It combines reliable relay switching with flexible Modbus communication, advanced timing and control functions, and comprehensive electrical isolation. Designed for harsh industrial environments, it ensures stable operation under electrical noise, temperature extremes, and communication interruptions. With its modular design, DIN-rail mounting, and user-friendly configuration, the SM_DO_108 provides a scalable and dependable solution for distributed control and monitoring applications across manufacturing, energy, and infrastructure sectors.
Product Name: 8-Channel Relay Output Module
Model: SM_DO_108
Series: SUNIX ioSCADA SM Series
Article Number: SM_DO_108
Manufacturer: Sunix Group
The SM_DO_108 is an industrial-grade relay output module designed for distributed control and data acquisition systems. It is part of the SUNIX ioSCADA SM series, a family of Modbus I/O modules engineered for SCADA, DCS, and PLC applications. The module provides eight independent relay outputs with Form A (normally open) contacts, supporting both AC and DC loads. It communicates via the RS-485 interface using standard Modbus RTU or ASCII protocols, ensuring compatibility with most industrial automation systems. The SM_DO_108 is built for harsh industrial environments, offering high noise immunity, 3-way isolation, and robust watchdog protection for both hardware and communication.
2. Key Features
- Eight Relay Outputs: Provides 8 Form A (normally open) relay channels for switching AC or DC loads.
- High Load Capacity: Each relay supports up to 5A at 250VAC or 30VDC, suitable for controlling solenoids, contactors, and other actuators.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire), ensuring interoperability with SCADA, PLC, and DCS systems.
- High-Speed Communication: Baud rates selectable from 1200 to 115.2 kbps (default 115.2 kbps).
- Addressable Network: Supports up to 63 modules on a single RS-485 bus without a repeater, with a maximum network distance of 4000 feet (1200 meters).
- 3-Way Isolation Protection: Provides 3000 Vrms isolation between RS-485, logic, and field sides, plus channel-to-channel isolation for enhanced safety and noise immunity.
- Dual Watchdog System: Hardware and communication watchdogs ensure continuous operation and fail-safe output states in case of communication loss.
- User-Friendly LED Indicators: LEDs display power, communication (RX/TX), I/O status, and terminal resistor activation for easy diagnostics.
- DIN-Rail Mounting: Compact industrial housing (132 × 125 × 47.5 mm) designed for DIN-rail installation, with slide-out labeling for easy maintenance.
- Wide Operating Temperature Range: Operates reliably from -30°C to +75°C, suitable for demanding industrial environments.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication failure conditions.
- TPC (Time Proportion Control): Converts analog percentage values (0–100%) into digital pulse-width outputs for process control applications.
- Software-Free Configuration: DIP switches allow setting of baud rate, Modbus address, and protocol type without requiring configuration software.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Reset to Factory Defaults: DIP switch function allows quick restoration of default settings.
3. Technical Specifications
- Output Channels: 8 relay outputs
- Relay Type: Form A (normally open)
- Contact Rating: 5A @ 250VAC / 5A @ 30VDC
- Maximum Output Current per Channel: 2A
- Minimum OFF Resistance: 1000 MΩ @ 500VDC
- Minimum ON Resistance: 30 mΩ @ 6VDC, 1A
- Output Response Time: ≤10 ms (from command receipt to relay activation)
- Mechanical Life: 2 × 10⁷ operations
- Electrical Life: 1 × 10⁵ operations at 1A load
- Line Voltage: Maximum 250VAC or 30VDC
- Power Supply: 10–30 VDC (typical 24VDC)
- Power Consumption: 0.1094A @ 24VDC (typical), 0.2687A max @ 10VDC
- Isolation Voltage: 3000 Vrms (RS-485 to logic and field sides)
- Network Isolation Voltage: 3 kV
- Overvoltage Protection: 70 VDC/Vp-p
- Dimensions: 132 × 125 × 47.5 mm
- Mounting: DIN-rail
- Wiring: I/O cable 16–24 AWG
- Operating Temperature: -30°C to +75°C
- Storage Temperature: -45°C to +85°C
- Relative Humidity: 5–90%, non-condensing
- Enclosure: Industrial-grade plastic housing
4. Functionality
The SM_DO_108 functions as a Modbus slave device on an RS-485 network, providing eight independent relay outputs that can be controlled remotely by a Modbus master such as a PLC, DCS, or SCADA system. Each output can be individually configured for direct switching, delayed activation, pulse output, or time-proportion control. The module supports both Modbus RTU and ASCII modes, selectable via DIP switch, and can operate at baud rates up to 115.2 kbps.
Use Cases and Applications:
- Industrial automation and process control
- SCADA and DCS remote I/O expansion
- Building automation and HVAC control
- Energy management and power distribution systems
- Machine control and safety interlocking
- Environmental monitoring and utility management
Compatibility:
Fully compatible with standard Modbus-based SCADA software such as LabView, Wonderware, Citect, and Intellution. It can also interface with PLCs and PACs from various manufacturers supporting Modbus RTU/ASCII.
5. Components & Accessories
Included Items:
- SM_DO_108 module
- DIN-rail mounting accessory
- Installation CD with ioCFG configuration utility
- Quick installation guide
Optional Accessories:
- RS-232/RS-485 isolation converter (for PCs without RS-485 ports)
- RS-485 repeater (for networks exceeding 1200 m)
- Panel mounting kit
Connectors:
- Removable terminal blocks for power, communication, and I/O
- RS-485 terminals: Data+, Data-, COM
- Power terminals: +VDC, GND
6. Installation & Setup
Requirements:
- Power supply: 10–30 VDC (industrial-grade, IEC61000-4-4 compliant)
- Host system: SCADA PC, PLC, PAC, or DCS with RS-485 interface
- Communication cable: Shielded twisted pair (EIA RS-485 standard)
Mounting Options:
- DIN-rail (horizontal or vertical orientation)
- Panel mounting (optional accessory)
Configuration:
- DIP Switch SW-1: Sets baud rate (1200–115200 bps) and protocol (RTU/ASCII)
- DIP Switch SW-2: Sets Modbus slave address (1–63) and factory reset (INIT)
- Factory Reset Procedure:
1. Power off the module
2. Set SW-2 DIP7 to ON
3. Power on the module
4. Return DIP7 to OFF within 5 seconds
LED Indicators:
- PWR: Power status
- RX/TX: Communication activity
- IO_ACC: I/O operation status
- Rt_ON: RS-485 terminal resistor enabled
Communication Parameters:
- Data bits: 8
- Parity: None
- Stop bits: 1
- Default baud rate: 115.2 kbps
- Default address: 1
Network Topology:
- Up to 63 modules per RS-485 segment
- Maximum cable length: 4000 feet (1200 m) without repeater
- Termination resistor enabled at network endpoints
7. Performance & Capabilities
- Relay Switching Speed: ≤10 ms response time
- Load Capacity: 5A per channel (AC/DC)
- Total Module Current: 8A maximum
- Communication Speed: Up to 115.2 kbps
- Network Capacity: 63 nodes per RS-485 segment
- Isolation: 3-way, 3000 Vrms
- Reliability: MTBF optimized for industrial environments
- Fail-Safe Operation: Outputs revert to predefined safe states upon communication loss
- Timer Functions:
- Output ON delay: 0–65535 s (1 s resolution)
- Output OFF delay: 0–65535 s (1 s resolution)
- Pulse output duration: 0–65535 s
- TPC duty cycle: 1–3000 (0.1–300 s)
- Fail-safe timeout: 0–65535 s
- Timer Accuracy: ±1%
Limitations:
- Maximum switching voltage: 250VAC or 30VDC
- Maximum current per channel: 2A continuous
- Not suitable for human safety or life-support applications
8. Standards & Compliance
Communication Standards:
- Modbus RTU/ASCII over RS-485 (3-wire)
- Supports Modbus function codes: 1, 2, 3, 4, 5, 6, 8, 15, 16, 17
Electrical & Environmental Compliance:
- EFT Immunity: IEC61000-4-4 Level 3 (power and signal lines)
- ESD Immunity: IEC61000-4-2 Level 3 (8 kV air, 4 kV contact)
- Surge Immunity: IEC61000-4-5 (0.5 kV)
- CE Compliant
Isolation & Protection:
- RS-485 isolation: 3000 Vrms
- Field-to-logic isolation: 3000 Vrms
- Channel-to-channel isolation: Yes
- Overvoltage protection: 70 VDC/Vp-p
Safety & Reliability:
- Dual watchdog (hardware and communication)
- Nonvolatile memory for configuration retention
- Reset-to-default capability
9. Additional Information
Warranty & Service Policy:
- Warranty Period: 2 years from delivery or 1 year after installation (whichever comes first)
- Coverage: Manufacturing defects under normal operating conditions
- Exclusions: Damage due to improper installation, misuse, or environmental conditions beyond specifications
- Repair Policy: Free repair during warranty period (shipping costs borne by customer); post-warranty repairs charged at ~25% of product price
- RMA Procedure: Requires authorization code, problem description, and proof of purchase
Maintenance:
- Periodic inspection of terminal connections and relay contacts recommended
- Ensure proper grounding and shielding of RS-485 network
- Replace fuses if overcurrent protection is triggered
Software & Updates:
- Configuration Utility: ioCFG (Windows-based) for monitoring and parameter setup
- Firmware Updates: Available through Sunix technical support
- Compatibility: Requires Windows XP or later with .NET Framework 2.0 or higher
Support Resources:
- Technical documentation and Modbus register maps included on installation CD
- Online resources and Modbus protocol references available at [www.modbus.org](http://www.modbus.org)
Summary
The Sunix SM_DO_108 is a robust, high-performance 8-channel relay output module engineered for industrial automation and SCADA systems. It combines reliable relay switching with flexible Modbus communication, advanced timing and control functions, and comprehensive electrical isolation. Designed for harsh industrial environments, it ensures stable operation under electrical noise, temperature extremes, and communication interruptions. With its modular design, DIN-rail mounting, and user-friendly configuration, the SM_DO_108 provides a scalable and dependable solution for distributed control and monitoring applications across manufacturing, energy, and infrastructure sectors.
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ModBus-IO-Modules.pdf
PDF Catalog
-
ioSCADA-Series_manual_En.pdf
Manual
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