LOOKING FOR THE RIGHT
INDUSTRIAL SOLUTION?
Discover embedded, communication and automation solutions tailored to your application.
- Dual Counter/Frequency Inputs: Two independent channels supporting up to 10 kHz counting rate with 50 µs minimum pulse width.
- Four Relay Outputs: Form A (normally open) relays rated at 5A @ 250 VAC or 5A @ 30 VDC.
- High-Speed Counting: Capable of processing 10,000 pulses per second with 1 Hz resolution.
- Non-Volatile Memory: Reprogrammable EEPROM retains configuration and calibration data after power loss.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire).
- Network Scalability: Up to 63 modules can be connected on a single RS-485 bus without a repeater, covering distances up to 4000 feet.
- Industrial-Grade Isolation: 3-way isolation (RS-485, field-to-logic, and channel-to-channel) rated at 3000 Vrms.
- Wide Operating Temperature: -20°C to +60°C for SM_CNT_102 (series supports -30°C to +75°C).
- User-Friendly Indicators: LED indicators for power, communication (RX/TX), I/O activity, and termination resistor status.
- Dual Watchdog Protection: Hardware and communication watchdogs ensure continuous operation and fail-safe output states.
- DIN-Rail Mounting: Compact 132 × 125 × 47.5 mm enclosure for easy installation in control panels.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication loss conditions.
- Modbus Compatibility: Fully compatible with major SCADA software such as LabView, Wonderware, Citect, and Intellution.
- Four Relay Outputs: Form A (normally open) relays rated at 5A @ 250 VAC or 5A @ 30 VDC.
- High-Speed Counting: Capable of processing 10,000 pulses per second with 1 Hz resolution.
- Non-Volatile Memory: Reprogrammable EEPROM retains configuration and calibration data after power loss.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire).
- Network Scalability: Up to 63 modules can be connected on a single RS-485 bus without a repeater, covering distances up to 4000 feet.
- Industrial-Grade Isolation: 3-way isolation (RS-485, field-to-logic, and channel-to-channel) rated at 3000 Vrms.
- Wide Operating Temperature: -20°C to +60°C for SM_CNT_102 (series supports -30°C to +75°C).
- User-Friendly Indicators: LED indicators for power, communication (RX/TX), I/O activity, and termination resistor status.
- Dual Watchdog Protection: Hardware and communication watchdogs ensure continuous operation and fail-safe output states.
- DIN-Rail Mounting: Compact 132 × 125 × 47.5 mm enclosure for easy installation in control panels.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication loss conditions.
- Modbus Compatibility: Fully compatible with major SCADA software such as LabView, Wonderware, Citect, and Intellution.
1. Product Overview
Name: 2 Channel Frequency/Counter 4-Relay Module
Model: SM_CNT_102
Series: SUNIX ioSCADA SM Series
Article Number: SM_CNT_102
Manufacturer: Sunix Group
The SM_CNT_102 is an industrial-grade Modbus I/O module designed for high-speed frequency and counter input applications. It belongs to the SUNIX ioSCADA SM series, a family of modular, DIN-rail mountable I/O devices supporting Modbus RTU and ASCII protocols over RS-485. The module integrates two high-speed counter/frequency input channels and four relay outputs, providing flexible control and monitoring capabilities for SCADA, DCS, and PLC systems in demanding industrial environments.
2. Key Features
- Dual Counter/Frequency Inputs: Two independent channels supporting up to 10 kHz counting rate with 50 µs minimum pulse width.
- Four Relay Outputs: Form A (normally open) relays rated at 5A @ 250 VAC or 5A @ 30 VDC.
- High-Speed Counting: Capable of processing 10,000 pulses per second with 1 Hz resolution.
- Non-Volatile Memory: Reprogrammable EEPROM retains configuration and calibration data after power loss.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire).
- Network Scalability: Up to 63 modules can be connected on a single RS-485 bus without a repeater, covering distances up to 4000 feet.
- Industrial-Grade Isolation: 3-way isolation (RS-485, field-to-logic, and channel-to-channel) rated at 3000 Vrms.
- Wide Operating Temperature: -20°C to +60°C for SM_CNT_102 (series supports -30°C to +75°C).
- User-Friendly Indicators: LED indicators for power, communication (RX/TX), I/O activity, and termination resistor status.
- Dual Watchdog Protection: Hardware and communication watchdogs ensure continuous operation and fail-safe output states.
- DIN-Rail Mounting: Compact 132 × 125 × 47.5 mm enclosure for easy installation in control panels.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication loss conditions.
- Modbus Compatibility: Fully compatible with major SCADA software such as LabView, Wonderware, Citect, and Intellution.
3. Technical Specifications
Physical Dimensions: 132 mm (L) × 125 mm (W) × 47.5 mm (H)
Mounting: DIN-rail or panel mount
Weight: Approx. 0.5 kg (typical for SM series modules)
Material: Industrial-grade ABS enclosure with removable terminal blocks
Electrical Characteristics:
- Power Supply: 10–30 VDC (nominal 24 VDC)
- Power Consumption: Typical 0.0943 A @ 24 VDC (max 0.2278 A)
- Input Channels: 2 frequency/counter inputs
- Input Range: 0–10,000 Hz
- Resolution: 1 Hz
- Minimum Pulse Width: 50 µs
- Input Impedance: 4.7 kΩ typical
- Logic Levels: OFF < 4 VDC, ON > 10 VDC
Relay Outputs:
- Channels: 4 Form A (normally open)
- Contact Rating: 5A @ 250 VAC / 5A @ 30 VDC
- Max Current per Channel: 2A
- Total Module Current: 8A
- Contact Resistance: ON ≤ 30 mΩ @ 6 VDC 1A; OFF ≥ 1000 MΩ @ 500 VDC
- Mechanical Life: 2 × 10⁷ operations
- Electrical Life: 1 × 10⁵ operations @ 1A load
- Response Time: ≤10 ms from command to output transition
Environmental:
- Operating Temperature: -20°C to +60°C
- Storage Temperature: -45°C to +85°C
- Humidity: 5–90% RH, non-condensing
- Isolation Voltage: 3000 Vrms (RS-485, field-to-logic, and channel-to-channel)
- Overvoltage Protection: 70 VDC/Vp-p
Communication Interface:
- Type: RS-485 (3-wire: Data+, Data–, COM)
- Protocol: Modbus RTU / ASCII
- Baud Rate: 1200–115200 bps (default 115.2 kbps)
- Data Format: 8 data bits, no parity, 1 stop bit
- Address Range: 1–63 (default 1)
- Network Distance: Up to 4000 ft (1200 m) without repeater
4. Functionality
The SM_CNT_102 functions as a dual-channel frequency and counter input module with integrated relay outputs for alarm or control signaling. Each input channel can operate in one of several modes:
- Cyclic Counting (High/Low Trigger): Counts pulses continuously, resetting to zero upon reaching a preset maximum.
- Stop Counting (High/Low Trigger): Stops counting when the maximum count value is reached.
- Frequency Measurement Mode: Measures input frequency up to 10 kHz with 1 Hz resolution.
The module’s four relay outputs can be configured for alarm signaling based on counter thresholds (High Alarm, High-High Alarm) or controlled directly via Modbus commands.
Use Cases:
- Industrial process monitoring (flow meters, turbine counters, RPM sensors)
- Machine cycle counting and production line monitoring
- Alarm signaling for over-speed or over-frequency conditions
- Integration with SCADA/DCS/PLC systems for distributed I/O control
Compatibility:
- Works with Modbus-compliant SCADA and PLC systems.
- Compatible with Sunix ioCFG configuration software for Windows.
- Supports integration with third-party Modbus masters and industrial automation software.
5. Components & Accessories
Included Items:
- SM_CNT_102 module
- DIN-rail mounting kit
- Installation CD with ioCFG configuration software
- Quick installation guide
Optional Accessories:
- RS-232/RS-485 isolation converter
- RS-485 repeater (for networks exceeding 1200 m)
- Panel mounting brackets
- Replacement terminal blocks
Connectors:
- Removable terminal blocks for power, I/O, and communication
- 16–24 AWG wire support
6. Installation & Setup
Requirements:
- 10–30 VDC power supply (industrial-grade, IEC61000-4-4 compliant)
- RS-485 communication line (shielded twisted pair recommended)
- Host system with Modbus RTU/ASCII master capability
Mounting Options:
- DIN-rail (horizontal or vertical orientation)
- Panel mount (front or back)
Configuration:
- DIP switches for baud rate, protocol selection (RTU/ASCII), and module address (1–63).
- SW-1 sets baud rate and protocol; SW-2 sets slave address and factory reset (INIT).
- Factory defaults: 115.2 kbps, address 1, Modbus RTU.
Reset to Factory Defaults:
1. Power off the module.
2. Set DIP7 (INIT) 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: Module operation status
- Rt_ON: RS-485 termination resistor enabled
Software Setup:
- Use ioCFG software for configuration and monitoring.
- Supports auto-scan for networked modules, parameter upload/download, and EEPROM save.
- Compatible with Windows XP and later (.NET Framework 2.0+ required).
7. Performance & Capabilities
- Counting Rate: Up to 10 kHz (50 µs ON/OFF pulse width)
- Resolution: 1 Hz
- Counter Range: 0–4,294,967,295 (32-bit counter)
- Alarm Modes: High Alarm, High-High Alarm, combined alarm output
- Relay Response Time: ≤10 ms
- Fail-Safe Operation: Outputs revert to predefined safe states upon communication loss.
- Watchdog Timers:
- Hardware Watchdog: Monitors CPU operation and resets on fault.
- Communication Watchdog: Detects Modbus link loss and enforces safe output states.
- Network Capacity: Up to 63 nodes without repeater; 4000 ft total bus length.
- Noise Immunity:
- EFT: IEC61000-4-4 Level 3
- ESD: IEC61000-4-2 Level 3 (8 kV air, 4 kV contact)
- Surge: IEC61000-4-5 (0.5 kV)
Limitations:
- No debounce, delay, or pulse generation functions on input channels.
- No analog output or TPC (time proportion control) functions.
- Designed for digital frequency/counter applications only.
8. Standards & Compliance
- Communication Protocol: Modbus RTU/ASCII (EIA RS-485 standard)
- Isolation: 3-way isolation, 3000 Vrms
- EMC Compliance:
- IEC61000-4-4 EFT Level 3
- IEC61000-4-2 ESD Level 3
- IEC61000-4-5 Surge 0.5 kV
- CE Certified: Conforms to European EMC directives
- Environmental: Industrial-grade operating range (-20°C to +60°C)
- Safety: Designed for industrial control systems; not for life-support or rescue applications.
9. Additional Information
Warranty:
- 2 years from delivery or 1 year after installation (whichever comes first).
- Covers manufacturing defects under normal operating conditions.
- Excludes damage from misuse, improper installation, or environmental conditions beyond specifications.
Service Policy:
- Free repair, testing, and adjustment during warranty (shipping costs borne by customer).
- Post-warranty repairs charged at approximately 25% of product price.
- RMA required for returns; products must be returned in original or equivalent packaging.
Maintenance:
- Periodic inspection of terminal connections and relay contacts recommended.
- Keep module free from dust and moisture; ensure proper grounding (PE).
- Firmware and configuration updates via ioCFG software.
Support:
- Technical documentation and Modbus register maps available from Sunix.
- Online resources: [www.sunix.com](http://www.sunix.com) and Modbus.org for protocol references.
Summary:
The Sunix SM_CNT_102 is a robust, high-performance Modbus I/O module engineered for industrial frequency and counter measurement applications. With dual high-speed inputs, four relay outputs, and comprehensive Modbus communication support, it provides reliable data acquisition and control in distributed automation systems. Its rugged design, wide temperature tolerance, and advanced isolation make it ideal for power plants, manufacturing lines, and process control environments requiring precise counting and alarm signaling.
Name: 2 Channel Frequency/Counter 4-Relay Module
Model: SM_CNT_102
Series: SUNIX ioSCADA SM Series
Article Number: SM_CNT_102
Manufacturer: Sunix Group
The SM_CNT_102 is an industrial-grade Modbus I/O module designed for high-speed frequency and counter input applications. It belongs to the SUNIX ioSCADA SM series, a family of modular, DIN-rail mountable I/O devices supporting Modbus RTU and ASCII protocols over RS-485. The module integrates two high-speed counter/frequency input channels and four relay outputs, providing flexible control and monitoring capabilities for SCADA, DCS, and PLC systems in demanding industrial environments.
2. Key Features
- Dual Counter/Frequency Inputs: Two independent channels supporting up to 10 kHz counting rate with 50 µs minimum pulse width.
- Four Relay Outputs: Form A (normally open) relays rated at 5A @ 250 VAC or 5A @ 30 VDC.
- High-Speed Counting: Capable of processing 10,000 pulses per second with 1 Hz resolution.
- Non-Volatile Memory: Reprogrammable EEPROM retains configuration and calibration data after power loss.
- Standard Modbus Communication: Supports Modbus RTU and ASCII protocols over RS-485 (3-wire).
- Network Scalability: Up to 63 modules can be connected on a single RS-485 bus without a repeater, covering distances up to 4000 feet.
- Industrial-Grade Isolation: 3-way isolation (RS-485, field-to-logic, and channel-to-channel) rated at 3000 Vrms.
- Wide Operating Temperature: -20°C to +60°C for SM_CNT_102 (series supports -30°C to +75°C).
- User-Friendly Indicators: LED indicators for power, communication (RX/TX), I/O activity, and termination resistor status.
- Dual Watchdog Protection: Hardware and communication watchdogs ensure continuous operation and fail-safe output states.
- DIN-Rail Mounting: Compact 132 × 125 × 47.5 mm enclosure for easy installation in control panels.
- High Noise Immunity: Meets IEC61000-4-4 EFT Level 3 and IEC61000-4-2 ESD Level 3 standards.
- Fail-Safe and Power-On Output Control: Configurable output states for startup and communication loss conditions.
- Modbus Compatibility: Fully compatible with major SCADA software such as LabView, Wonderware, Citect, and Intellution.
3. Technical Specifications
Physical Dimensions: 132 mm (L) × 125 mm (W) × 47.5 mm (H)
Mounting: DIN-rail or panel mount
Weight: Approx. 0.5 kg (typical for SM series modules)
Material: Industrial-grade ABS enclosure with removable terminal blocks
Electrical Characteristics:
- Power Supply: 10–30 VDC (nominal 24 VDC)
- Power Consumption: Typical 0.0943 A @ 24 VDC (max 0.2278 A)
- Input Channels: 2 frequency/counter inputs
- Input Range: 0–10,000 Hz
- Resolution: 1 Hz
- Minimum Pulse Width: 50 µs
- Input Impedance: 4.7 kΩ typical
- Logic Levels: OFF < 4 VDC, ON > 10 VDC
Relay Outputs:
- Channels: 4 Form A (normally open)
- Contact Rating: 5A @ 250 VAC / 5A @ 30 VDC
- Max Current per Channel: 2A
- Total Module Current: 8A
- Contact Resistance: ON ≤ 30 mΩ @ 6 VDC 1A; OFF ≥ 1000 MΩ @ 500 VDC
- Mechanical Life: 2 × 10⁷ operations
- Electrical Life: 1 × 10⁵ operations @ 1A load
- Response Time: ≤10 ms from command to output transition
Environmental:
- Operating Temperature: -20°C to +60°C
- Storage Temperature: -45°C to +85°C
- Humidity: 5–90% RH, non-condensing
- Isolation Voltage: 3000 Vrms (RS-485, field-to-logic, and channel-to-channel)
- Overvoltage Protection: 70 VDC/Vp-p
Communication Interface:
- Type: RS-485 (3-wire: Data+, Data–, COM)
- Protocol: Modbus RTU / ASCII
- Baud Rate: 1200–115200 bps (default 115.2 kbps)
- Data Format: 8 data bits, no parity, 1 stop bit
- Address Range: 1–63 (default 1)
- Network Distance: Up to 4000 ft (1200 m) without repeater
4. Functionality
The SM_CNT_102 functions as a dual-channel frequency and counter input module with integrated relay outputs for alarm or control signaling. Each input channel can operate in one of several modes:
- Cyclic Counting (High/Low Trigger): Counts pulses continuously, resetting to zero upon reaching a preset maximum.
- Stop Counting (High/Low Trigger): Stops counting when the maximum count value is reached.
- Frequency Measurement Mode: Measures input frequency up to 10 kHz with 1 Hz resolution.
The module’s four relay outputs can be configured for alarm signaling based on counter thresholds (High Alarm, High-High Alarm) or controlled directly via Modbus commands.
Use Cases:
- Industrial process monitoring (flow meters, turbine counters, RPM sensors)
- Machine cycle counting and production line monitoring
- Alarm signaling for over-speed or over-frequency conditions
- Integration with SCADA/DCS/PLC systems for distributed I/O control
Compatibility:
- Works with Modbus-compliant SCADA and PLC systems.
- Compatible with Sunix ioCFG configuration software for Windows.
- Supports integration with third-party Modbus masters and industrial automation software.
5. Components & Accessories
Included Items:
- SM_CNT_102 module
- DIN-rail mounting kit
- Installation CD with ioCFG configuration software
- Quick installation guide
Optional Accessories:
- RS-232/RS-485 isolation converter
- RS-485 repeater (for networks exceeding 1200 m)
- Panel mounting brackets
- Replacement terminal blocks
Connectors:
- Removable terminal blocks for power, I/O, and communication
- 16–24 AWG wire support
6. Installation & Setup
Requirements:
- 10–30 VDC power supply (industrial-grade, IEC61000-4-4 compliant)
- RS-485 communication line (shielded twisted pair recommended)
- Host system with Modbus RTU/ASCII master capability
Mounting Options:
- DIN-rail (horizontal or vertical orientation)
- Panel mount (front or back)
Configuration:
- DIP switches for baud rate, protocol selection (RTU/ASCII), and module address (1–63).
- SW-1 sets baud rate and protocol; SW-2 sets slave address and factory reset (INIT).
- Factory defaults: 115.2 kbps, address 1, Modbus RTU.
Reset to Factory Defaults:
1. Power off the module.
2. Set DIP7 (INIT) 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: Module operation status
- Rt_ON: RS-485 termination resistor enabled
Software Setup:
- Use ioCFG software for configuration and monitoring.
- Supports auto-scan for networked modules, parameter upload/download, and EEPROM save.
- Compatible with Windows XP and later (.NET Framework 2.0+ required).
7. Performance & Capabilities
- Counting Rate: Up to 10 kHz (50 µs ON/OFF pulse width)
- Resolution: 1 Hz
- Counter Range: 0–4,294,967,295 (32-bit counter)
- Alarm Modes: High Alarm, High-High Alarm, combined alarm output
- Relay Response Time: ≤10 ms
- Fail-Safe Operation: Outputs revert to predefined safe states upon communication loss.
- Watchdog Timers:
- Hardware Watchdog: Monitors CPU operation and resets on fault.
- Communication Watchdog: Detects Modbus link loss and enforces safe output states.
- Network Capacity: Up to 63 nodes without repeater; 4000 ft total bus length.
- Noise Immunity:
- EFT: IEC61000-4-4 Level 3
- ESD: IEC61000-4-2 Level 3 (8 kV air, 4 kV contact)
- Surge: IEC61000-4-5 (0.5 kV)
Limitations:
- No debounce, delay, or pulse generation functions on input channels.
- No analog output or TPC (time proportion control) functions.
- Designed for digital frequency/counter applications only.
8. Standards & Compliance
- Communication Protocol: Modbus RTU/ASCII (EIA RS-485 standard)
- Isolation: 3-way isolation, 3000 Vrms
- EMC Compliance:
- IEC61000-4-4 EFT Level 3
- IEC61000-4-2 ESD Level 3
- IEC61000-4-5 Surge 0.5 kV
- CE Certified: Conforms to European EMC directives
- Environmental: Industrial-grade operating range (-20°C to +60°C)
- Safety: Designed for industrial control systems; not for life-support or rescue applications.
9. Additional Information
Warranty:
- 2 years from delivery or 1 year after installation (whichever comes first).
- Covers manufacturing defects under normal operating conditions.
- Excludes damage from misuse, improper installation, or environmental conditions beyond specifications.
Service Policy:
- Free repair, testing, and adjustment during warranty (shipping costs borne by customer).
- Post-warranty repairs charged at approximately 25% of product price.
- RMA required for returns; products must be returned in original or equivalent packaging.
Maintenance:
- Periodic inspection of terminal connections and relay contacts recommended.
- Keep module free from dust and moisture; ensure proper grounding (PE).
- Firmware and configuration updates via ioCFG software.
Support:
- Technical documentation and Modbus register maps available from Sunix.
- Online resources: [www.sunix.com](http://www.sunix.com) and Modbus.org for protocol references.
Summary:
The Sunix SM_CNT_102 is a robust, high-performance Modbus I/O module engineered for industrial frequency and counter measurement applications. With dual high-speed inputs, four relay outputs, and comprehensive Modbus communication support, it provides reliable data acquisition and control in distributed automation systems. Its rugged design, wide temperature tolerance, and advanced isolation make it ideal for power plants, manufacturing lines, and process control environments requiring precise counting and alarm signaling.
-
ModBus-IO-Modules.pdf
PDF Catalog
-
ioSCADA-Series_manual_En.pdf
Manual
No accessories available.
