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- 8 Optically Isolated Digital Inputs (DI): Each input channel is optically isolated to protect control electronics from voltage spikes, ground loops, and electrical noise.
- 8 Relay-Based Digital Outputs (DO): The output section consists of eight independent relays capable of switching external loads, providing galvanic isolation between control and load circuits.
- Adjustable Switching Threshold: The input switching threshold can be configured between 3 V DC and 24 V DC, allowing compatibility with various logic levels and sensor signal voltages.
- LED Status Indicators: Each input and output channel is equipped with an LED indicator for real-time visual monitoring of signal and relay states, simplifying diagnostics and system verification.
- Dual 12-Pin Terminal Blocks: The panel features 2 × 12 double terminal connectors for secure and organized wiring of input and output signals.
- Standard 50-Pin Ribbon Cable Interface: The module connects to control systems or I/O cards via a 1-meter flat ribbon cable terminated with a 50-pin connector, ensuring quick and reliable installation.
- Compact Form Factor: With dimensions of 220 × 132 × 15 mm, the AX757 offers a space-efficient solution for control cabinets and panel installations.
- Electrical Isolation: Full galvanic isolation between input, output, and control circuits enhances system safety and prevents interference.
- Industrial-Grade Design: Built for durability and long-term operation in demanding environments, with robust mechanical construction and high-quality components.
- 8 Relay-Based Digital Outputs (DO): The output section consists of eight independent relays capable of switching external loads, providing galvanic isolation between control and load circuits.
- Adjustable Switching Threshold: The input switching threshold can be configured between 3 V DC and 24 V DC, allowing compatibility with various logic levels and sensor signal voltages.
- LED Status Indicators: Each input and output channel is equipped with an LED indicator for real-time visual monitoring of signal and relay states, simplifying diagnostics and system verification.
- Dual 12-Pin Terminal Blocks: The panel features 2 × 12 double terminal connectors for secure and organized wiring of input and output signals.
- Standard 50-Pin Ribbon Cable Interface: The module connects to control systems or I/O cards via a 1-meter flat ribbon cable terminated with a 50-pin connector, ensuring quick and reliable installation.
- Compact Form Factor: With dimensions of 220 × 132 × 15 mm, the AX757 offers a space-efficient solution for control cabinets and panel installations.
- Electrical Isolation: Full galvanic isolation between input, output, and control circuits enhances system safety and prevents interference.
- Industrial-Grade Design: Built for durability and long-term operation in demanding environments, with robust mechanical construction and high-quality components.
1. Product Overview
Product Name: Isolated 8 DI 8 DO Relay Panel
Model: AX757
Series: AX Series – Digital I/O Interface Modules
Article Number: AX757
Manufacturer: Axiom
The Axiom AX757 is a compact, isolated digital input/output (I/O) relay interface panel designed for industrial control, automation, and signal interfacing applications. It provides eight optically isolated digital inputs (DI) and eight relay-based digital outputs (DO) in a single, integrated module. The panel is engineered to ensure reliable signal isolation, flexible voltage compatibility, and straightforward integration with control systems via a 50-pin ribbon cable connector. Its robust design, LED status indicators, and configurable switching thresholds make it suitable for a wide range of industrial and laboratory environments where electrical isolation and signal integrity are critical.
2. Key Features
- 8 Optically Isolated Digital Inputs (DI): Each input channel is optically isolated to protect control electronics from voltage spikes, ground loops, and electrical noise.
- 8 Relay-Based Digital Outputs (DO): The output section consists of eight independent relays capable of switching external loads, providing galvanic isolation between control and load circuits.
- Adjustable Switching Threshold: The input switching threshold can be configured between 3 V DC and 24 V DC, allowing compatibility with various logic levels and sensor signal voltages.
- LED Status Indicators: Each input and output channel is equipped with an LED indicator for real-time visual monitoring of signal and relay states, simplifying diagnostics and system verification.
- Dual 12-Pin Terminal Blocks: The panel features 2 × 12 double terminal connectors for secure and organized wiring of input and output signals.
- Standard 50-Pin Ribbon Cable Interface: The module connects to control systems or I/O cards via a 1-meter flat ribbon cable terminated with a 50-pin connector, ensuring quick and reliable installation.
- Compact Form Factor: With dimensions of 220 × 132 × 15 mm, the AX757 offers a space-efficient solution for control cabinets and panel installations.
- Electrical Isolation: Full galvanic isolation between input, output, and control circuits enhances system safety and prevents interference.
- Industrial-Grade Design: Built for durability and long-term operation in demanding environments, with robust mechanical construction and high-quality components.
3. Technical Specifications
- Model: AX757
- Manufacturer: Axiom
- Input Channels: 8 optically isolated digital inputs
- Output Channels: 8 relay outputs
- Input Type: Opto-isolated digital input
- Input Voltage Range: Configurable switching threshold from 3 V DC to 24 V DC
- Output Type: Electromechanical relay contacts
- Isolation Type: Optical isolation between input and control circuits; galvanic isolation between input and output
- Indicators: 16 LEDs total (8 for inputs, 8 for outputs)
- Connectors:
- Signal Interface: 50-pin flat ribbon cable connector
- Cable Length: 1 meter (included)
- Terminal Blocks: 2 × 12 double terminal connectors for field wiring
- Dimensions: 220 mm (L) × 132 mm (W) × 15 mm (H)
- Weight: Approx. dependent on configuration (typically < 500 g)
- Mounting: Panel or enclosure mounting
- Material: Industrial-grade PCB with protective coating and terminal housings
- Operating Voltage: Compatible with standard control voltages (3–24 V DC input range)
- Relay Contact Rating: Typically supports low to moderate current switching (exact rating dependent on relay type used)
- Environmental Conditions: Designed for standard industrial environments; recommended ambient temperature 0–50 °C; non-condensing humidity
4. Functionality
The Axiom AX757 serves as an interface module between control systems (such as PLCs, microcontrollers, or data acquisition cards) and field devices (sensors, actuators, or external circuits).
- Input Functionality:
Each of the eight digital input channels receives signals from external sensors or switches. The opto-isolators convert these signals into logic-level inputs while maintaining electrical isolation. The adjustable threshold (3–24 V DC) allows the module to accept signals from various sources, including TTL, CMOS, or industrial sensors.
- Output Functionality:
The eight relay outputs act as electrically isolated switches controlled by the input logic or external control signals. Each relay can drive external loads such as solenoids, lamps, contactors, or other low-voltage devices.
- LED Indicators:
Each input and output channel has a dedicated LED that illuminates when the corresponding channel is active, providing immediate visual feedback for system status and troubleshooting.
- Applications:
- Industrial automation and process control
- Machine interfacing and signal conditioning
- Laboratory test setups and prototyping
- PLC and microcontroller I/O expansion
- Electrical isolation between control and power circuits
- Monitoring and control of external devices in distributed systems
- Compatibility:
The 50-pin ribbon cable interface ensures compatibility with a wide range of digital I/O cards, backplanes, and control modules that use standard pin assignments.
5. Components & Accessories
Included Items:
- AX757 isolated 8 DI / 8 DO relay panel
- 1-meter flat ribbon cable with 50-pin connector
- Integrated LED indicators for all channels
- Dual 12-pin terminal blocks for field wiring
Optional Accessories (depending on configuration):
- Extended-length ribbon cables (for remote mounting)
- DIN-rail mounting adapters or brackets
- Replacement terminal connectors
- Protective enclosures or covers for harsh environments
Connectors and Interfaces:
- 50-pin Ribbon Connector: Standard IDC-type connector for direct connection to compatible I/O cards.
- Terminal Blocks: Two 12-pin double terminal blocks for secure connection of input and output wiring.
6. Installation & Setup
Requirements:
- Compatible control system or I/O card with a 50-pin interface
- Power supply and signal wiring within the supported voltage range (3–24 V DC for inputs)
- Mounting surface or enclosure with sufficient space (minimum 220 × 132 mm footprint)
Mounting Options:
- Panel mounting using screws or standoffs
- Integration into control cabinets or DIN-rail systems (with optional adapter)
Configuration Steps:
1. Mount the Panel: Secure the AX757 in the desired location within the control cabinet or test setup.
2. Connect the Ribbon Cable: Attach the 50-pin ribbon cable to the corresponding connector on the control system or I/O card.
3. Wire Inputs and Outputs: Connect field devices to the terminal blocks, ensuring correct polarity and voltage levels.
4. Set Input Threshold (if applicable): Adjust the input switching threshold to match the signal voltage range (3–24 V DC).
5. Power On and Test: Apply power and verify operation using the LED indicators for each channel.
Safety Considerations:
- Ensure all wiring is performed with power disconnected.
- Observe proper grounding and shielding practices to minimize noise.
- Verify that relay load ratings are not exceeded.
7. Performance & Capabilities
- Input Response: Fast opto-isolated input response suitable for digital signal detection and control logic interfacing.
- Output Switching: Relay outputs provide reliable switching for low to moderate current loads, ensuring electrical isolation and mechanical durability.
- Signal Integrity: Optical isolation prevents ground loops and cross-channel interference, maintaining clean signal transmission.
- Efficiency: Low power consumption design optimized for continuous operation in industrial environments.
- Reliability: High-quality relays and opto-isolators ensure long operational life and consistent performance.
- Limitations:
- Relay switching speed is limited compared to solid-state outputs (typical mechanical relay response).
- Not intended for high-frequency or high-current switching applications.
- Requires appropriate external protection for inductive loads (e.g., flyback diodes).
8. Standards & Compliance
The AX757 is designed and manufactured in accordance with general industrial electronic standards and best practices for safety and reliability.
Compliance and Standards (typical for Axiom industrial modules):
- Electrical Safety: Conforms to low-voltage directive requirements for industrial control equipment.
- EMC Compliance: Designed to meet electromagnetic compatibility standards for industrial environments.
- RoHS Compliance: Manufactured using lead-free and environmentally compliant materials.
- Quality Assurance: Produced under ISO 9001-certified manufacturing processes.
Isolation and Protection:
- Optical isolation between input and control circuits
- Galvanic separation between input and output channels
- Protection against transient voltages and electrical noise
9. Additional Information
Warranty:
Axiom typically provides a standard manufacturer’s warranty covering defects in materials and workmanship for a specified period (commonly 12–24 months, depending on region and distributor).
Support:
Technical documentation, wiring diagrams, and configuration guides are available from Axiom’s support portal. Engineering support is provided for integration, troubleshooting, and application-specific customization.
Maintenance:
- Periodic inspection of terminal connections and relay contacts is recommended.
- Ensure that the panel remains free from dust and moisture.
- Replace relays as needed after extended operational cycles.
Firmware/Hardware Updates:
As a hardware-based relay interface, the AX757 does not require firmware updates. However, Axiom may release updated hardware revisions or accessories to enhance compatibility and performance.
Serviceability:
The modular design allows for straightforward replacement of relays or connectors if required. The use of standard components ensures long-term serviceability and availability of spare parts.
Documentation:
Comprehensive datasheets, wiring diagrams, and pinout references are provided to facilitate integration with various control systems.
Summary
The Axiom AX757 Isolated 8 DI / 8 DO Relay Panel is a versatile and reliable digital I/O interface module designed for industrial automation, control, and signal isolation applications. With eight optically isolated inputs, eight relay outputs, adjustable input thresholds (3–24 V DC), and integrated LED indicators, it provides a robust solution for interfacing control systems with external devices. The inclusion of a 1-meter 50-pin ribbon cable, dual 12-pin terminal blocks, and compact 220 × 132 × 15 mm form factor ensures ease of installation and integration. Built to industrial standards with full electrical isolation and durable construction, the AX757 delivers dependable performance, safety, and flexibility for a wide range of automation and control environments.
Product Name: Isolated 8 DI 8 DO Relay Panel
Model: AX757
Series: AX Series – Digital I/O Interface Modules
Article Number: AX757
Manufacturer: Axiom
The Axiom AX757 is a compact, isolated digital input/output (I/O) relay interface panel designed for industrial control, automation, and signal interfacing applications. It provides eight optically isolated digital inputs (DI) and eight relay-based digital outputs (DO) in a single, integrated module. The panel is engineered to ensure reliable signal isolation, flexible voltage compatibility, and straightforward integration with control systems via a 50-pin ribbon cable connector. Its robust design, LED status indicators, and configurable switching thresholds make it suitable for a wide range of industrial and laboratory environments where electrical isolation and signal integrity are critical.
2. Key Features
- 8 Optically Isolated Digital Inputs (DI): Each input channel is optically isolated to protect control electronics from voltage spikes, ground loops, and electrical noise.
- 8 Relay-Based Digital Outputs (DO): The output section consists of eight independent relays capable of switching external loads, providing galvanic isolation between control and load circuits.
- Adjustable Switching Threshold: The input switching threshold can be configured between 3 V DC and 24 V DC, allowing compatibility with various logic levels and sensor signal voltages.
- LED Status Indicators: Each input and output channel is equipped with an LED indicator for real-time visual monitoring of signal and relay states, simplifying diagnostics and system verification.
- Dual 12-Pin Terminal Blocks: The panel features 2 × 12 double terminal connectors for secure and organized wiring of input and output signals.
- Standard 50-Pin Ribbon Cable Interface: The module connects to control systems or I/O cards via a 1-meter flat ribbon cable terminated with a 50-pin connector, ensuring quick and reliable installation.
- Compact Form Factor: With dimensions of 220 × 132 × 15 mm, the AX757 offers a space-efficient solution for control cabinets and panel installations.
- Electrical Isolation: Full galvanic isolation between input, output, and control circuits enhances system safety and prevents interference.
- Industrial-Grade Design: Built for durability and long-term operation in demanding environments, with robust mechanical construction and high-quality components.
3. Technical Specifications
- Model: AX757
- Manufacturer: Axiom
- Input Channels: 8 optically isolated digital inputs
- Output Channels: 8 relay outputs
- Input Type: Opto-isolated digital input
- Input Voltage Range: Configurable switching threshold from 3 V DC to 24 V DC
- Output Type: Electromechanical relay contacts
- Isolation Type: Optical isolation between input and control circuits; galvanic isolation between input and output
- Indicators: 16 LEDs total (8 for inputs, 8 for outputs)
- Connectors:
- Signal Interface: 50-pin flat ribbon cable connector
- Cable Length: 1 meter (included)
- Terminal Blocks: 2 × 12 double terminal connectors for field wiring
- Dimensions: 220 mm (L) × 132 mm (W) × 15 mm (H)
- Weight: Approx. dependent on configuration (typically < 500 g)
- Mounting: Panel or enclosure mounting
- Material: Industrial-grade PCB with protective coating and terminal housings
- Operating Voltage: Compatible with standard control voltages (3–24 V DC input range)
- Relay Contact Rating: Typically supports low to moderate current switching (exact rating dependent on relay type used)
- Environmental Conditions: Designed for standard industrial environments; recommended ambient temperature 0–50 °C; non-condensing humidity
4. Functionality
The Axiom AX757 serves as an interface module between control systems (such as PLCs, microcontrollers, or data acquisition cards) and field devices (sensors, actuators, or external circuits).
- Input Functionality:
Each of the eight digital input channels receives signals from external sensors or switches. The opto-isolators convert these signals into logic-level inputs while maintaining electrical isolation. The adjustable threshold (3–24 V DC) allows the module to accept signals from various sources, including TTL, CMOS, or industrial sensors.
- Output Functionality:
The eight relay outputs act as electrically isolated switches controlled by the input logic or external control signals. Each relay can drive external loads such as solenoids, lamps, contactors, or other low-voltage devices.
- LED Indicators:
Each input and output channel has a dedicated LED that illuminates when the corresponding channel is active, providing immediate visual feedback for system status and troubleshooting.
- Applications:
- Industrial automation and process control
- Machine interfacing and signal conditioning
- Laboratory test setups and prototyping
- PLC and microcontroller I/O expansion
- Electrical isolation between control and power circuits
- Monitoring and control of external devices in distributed systems
- Compatibility:
The 50-pin ribbon cable interface ensures compatibility with a wide range of digital I/O cards, backplanes, and control modules that use standard pin assignments.
5. Components & Accessories
Included Items:
- AX757 isolated 8 DI / 8 DO relay panel
- 1-meter flat ribbon cable with 50-pin connector
- Integrated LED indicators for all channels
- Dual 12-pin terminal blocks for field wiring
Optional Accessories (depending on configuration):
- Extended-length ribbon cables (for remote mounting)
- DIN-rail mounting adapters or brackets
- Replacement terminal connectors
- Protective enclosures or covers for harsh environments
Connectors and Interfaces:
- 50-pin Ribbon Connector: Standard IDC-type connector for direct connection to compatible I/O cards.
- Terminal Blocks: Two 12-pin double terminal blocks for secure connection of input and output wiring.
6. Installation & Setup
Requirements:
- Compatible control system or I/O card with a 50-pin interface
- Power supply and signal wiring within the supported voltage range (3–24 V DC for inputs)
- Mounting surface or enclosure with sufficient space (minimum 220 × 132 mm footprint)
Mounting Options:
- Panel mounting using screws or standoffs
- Integration into control cabinets or DIN-rail systems (with optional adapter)
Configuration Steps:
1. Mount the Panel: Secure the AX757 in the desired location within the control cabinet or test setup.
2. Connect the Ribbon Cable: Attach the 50-pin ribbon cable to the corresponding connector on the control system or I/O card.
3. Wire Inputs and Outputs: Connect field devices to the terminal blocks, ensuring correct polarity and voltage levels.
4. Set Input Threshold (if applicable): Adjust the input switching threshold to match the signal voltage range (3–24 V DC).
5. Power On and Test: Apply power and verify operation using the LED indicators for each channel.
Safety Considerations:
- Ensure all wiring is performed with power disconnected.
- Observe proper grounding and shielding practices to minimize noise.
- Verify that relay load ratings are not exceeded.
7. Performance & Capabilities
- Input Response: Fast opto-isolated input response suitable for digital signal detection and control logic interfacing.
- Output Switching: Relay outputs provide reliable switching for low to moderate current loads, ensuring electrical isolation and mechanical durability.
- Signal Integrity: Optical isolation prevents ground loops and cross-channel interference, maintaining clean signal transmission.
- Efficiency: Low power consumption design optimized for continuous operation in industrial environments.
- Reliability: High-quality relays and opto-isolators ensure long operational life and consistent performance.
- Limitations:
- Relay switching speed is limited compared to solid-state outputs (typical mechanical relay response).
- Not intended for high-frequency or high-current switching applications.
- Requires appropriate external protection for inductive loads (e.g., flyback diodes).
8. Standards & Compliance
The AX757 is designed and manufactured in accordance with general industrial electronic standards and best practices for safety and reliability.
Compliance and Standards (typical for Axiom industrial modules):
- Electrical Safety: Conforms to low-voltage directive requirements for industrial control equipment.
- EMC Compliance: Designed to meet electromagnetic compatibility standards for industrial environments.
- RoHS Compliance: Manufactured using lead-free and environmentally compliant materials.
- Quality Assurance: Produced under ISO 9001-certified manufacturing processes.
Isolation and Protection:
- Optical isolation between input and control circuits
- Galvanic separation between input and output channels
- Protection against transient voltages and electrical noise
9. Additional Information
Warranty:
Axiom typically provides a standard manufacturer’s warranty covering defects in materials and workmanship for a specified period (commonly 12–24 months, depending on region and distributor).
Support:
Technical documentation, wiring diagrams, and configuration guides are available from Axiom’s support portal. Engineering support is provided for integration, troubleshooting, and application-specific customization.
Maintenance:
- Periodic inspection of terminal connections and relay contacts is recommended.
- Ensure that the panel remains free from dust and moisture.
- Replace relays as needed after extended operational cycles.
Firmware/Hardware Updates:
As a hardware-based relay interface, the AX757 does not require firmware updates. However, Axiom may release updated hardware revisions or accessories to enhance compatibility and performance.
Serviceability:
The modular design allows for straightforward replacement of relays or connectors if required. The use of standard components ensures long-term serviceability and availability of spare parts.
Documentation:
Comprehensive datasheets, wiring diagrams, and pinout references are provided to facilitate integration with various control systems.
Summary
The Axiom AX757 Isolated 8 DI / 8 DO Relay Panel is a versatile and reliable digital I/O interface module designed for industrial automation, control, and signal isolation applications. With eight optically isolated inputs, eight relay outputs, adjustable input thresholds (3–24 V DC), and integrated LED indicators, it provides a robust solution for interfacing control systems with external devices. The inclusion of a 1-meter 50-pin ribbon cable, dual 12-pin terminal blocks, and compact 220 × 132 × 15 mm form factor ensures ease of installation and integration. Built to industrial standards with full electrical isolation and durable construction, the AX757 delivers dependable performance, safety, and flexibility for a wide range of automation and control environments.
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