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- 24 Isolated Relay Outputs: Provides 24 independent relay channels for digital output control, enabling simultaneous switching of multiple loads.
- High Voltage and Current Capacity: Each relay channel supports up to 125 V AC at 2 A, suitable for controlling solenoids, contactors, lamps, and other AC-driven devices.
- Changeover (SPDT) Contacts: Each relay features a single-pole double-throw (SPDT) configuration, offering both normally open (NO) and normally closed (NC) contact options for flexible circuit design.
- Electrical Isolation: Full galvanic isolation between control and output circuits enhances system safety and prevents ground loops or interference.
- Compact Design: Measuring 220 mm × 132 mm × 15 mm, the panel offers high channel density in a slim profile suitable for control cabinets and DIN-rail installations.
- Convenient Wiring Interface: Equipped with 2 × 18 dual terminal blocks for easy connection of field wiring, simplifying installation and maintenance.
- Standardized Connectivity: Includes a 1 m flat ribbon cable terminated with a 50-pin connector, compatible with standard digital output modules and interface boards.
- Industrial-Grade Reliability: Built with high-quality relays and durable materials to ensure long operational life and consistent performance under industrial conditions.
- Versatile Application Range: Ideal for automation systems, process control, machine interfacing, and signal switching in manufacturing, energy, and building automation sectors.
- High Voltage and Current Capacity: Each relay channel supports up to 125 V AC at 2 A, suitable for controlling solenoids, contactors, lamps, and other AC-driven devices.
- Changeover (SPDT) Contacts: Each relay features a single-pole double-throw (SPDT) configuration, offering both normally open (NO) and normally closed (NC) contact options for flexible circuit design.
- Electrical Isolation: Full galvanic isolation between control and output circuits enhances system safety and prevents ground loops or interference.
- Compact Design: Measuring 220 mm × 132 mm × 15 mm, the panel offers high channel density in a slim profile suitable for control cabinets and DIN-rail installations.
- Convenient Wiring Interface: Equipped with 2 × 18 dual terminal blocks for easy connection of field wiring, simplifying installation and maintenance.
- Standardized Connectivity: Includes a 1 m flat ribbon cable terminated with a 50-pin connector, compatible with standard digital output modules and interface boards.
- Industrial-Grade Reliability: Built with high-quality relays and durable materials to ensure long operational life and consistent performance under industrial conditions.
- Versatile Application Range: Ideal for automation systems, process control, machine interfacing, and signal switching in manufacturing, energy, and building automation sectors.
1. Product Overview
Product Name: Isolated 24 DO Relay Panel (120 VAC)
Model: AX756A
Series: AX Series – Digital Output Relay Interface Modules
Article Number: AX756A
Manufacturer: Axiom
The Axiom AX756A is a high-performance, isolated 24-channel digital output (DO) relay panel designed for industrial automation, control systems, and signal switching applications. It provides galvanic isolation between control logic and high-voltage output circuits, ensuring safe and reliable operation in demanding environments. The panel supports up to 24 relay outputs, each capable of switching AC loads up to 125 V AC at 2 A. With its compact form factor, robust construction, and standardized 50-pin ribbon cable interface, the AX756A integrates seamlessly into PLC, DCS, and I/O expansion systems.
2. Key Features
- 24 Isolated Relay Outputs: Provides 24 independent relay channels for digital output control, enabling simultaneous switching of multiple loads.
- High Voltage and Current Capacity: Each relay channel supports up to 125 V AC at 2 A, suitable for controlling solenoids, contactors, lamps, and other AC-driven devices.
- Changeover (SPDT) Contacts: Each relay features a single-pole double-throw (SPDT) configuration, offering both normally open (NO) and normally closed (NC) contact options for flexible circuit design.
- Electrical Isolation: Full galvanic isolation between control and output circuits enhances system safety and prevents ground loops or interference.
- Compact Design: Measuring 220 mm × 132 mm × 15 mm, the panel offers high channel density in a slim profile suitable for control cabinets and DIN-rail installations.
- Convenient Wiring Interface: Equipped with 2 × 18 dual terminal blocks for easy connection of field wiring, simplifying installation and maintenance.
- Standardized Connectivity: Includes a 1 m flat ribbon cable terminated with a 50-pin connector, compatible with standard digital output modules and interface boards.
- Industrial-Grade Reliability: Built with high-quality relays and durable materials to ensure long operational life and consistent performance under industrial conditions.
- Versatile Application Range: Ideal for automation systems, process control, machine interfacing, and signal switching in manufacturing, energy, and building automation sectors.
3. Technical Specifications
- Model: AX756A
- Type: Isolated 24-channel digital output relay panel
- Number of Channels: 24 relay outputs
- Relay Type: Electromechanical, SPDT (single-pole double-throw)
- Contact Configuration: Changeover contacts (NO/NC)
- Maximum Switching Voltage: 125 V AC
- Maximum Switching Current: 2 A per channel
- Isolation: Galvanic isolation between control and output circuits
- Control Interface: 50-pin ribbon cable connector (standard pinout for digital output modules)
- Cable Length: 1 m flat ribbon cable included
- Terminal Blocks: 2 × 18 dual terminal blocks for field wiring
- Dimensions: 220 mm (W) × 132 mm (H) × 15 mm (D)
- Weight: Approx. 0.5 kg (typical, depending on configuration)
- Material: Industrial-grade PCB with protective coating; terminal blocks and connectors made of high-durability thermoplastic
- Operating Voltage (Control Side): Typically 5 V DC or 24 V DC logic-level control (depending on connected controller)
- Operating Temperature Range: 0 °C to +55 °C (typical industrial environment)
- Storage Temperature Range: –20 °C to +70 °C
- Humidity: 10 % to 90 % RH, non-condensing
- Mounting: Panel or DIN-rail compatible (with optional mounting accessories)
4. Functionality
The AX756A functions as an interface module between low-voltage digital control signals and high-voltage AC loads. Each of the 24 relay channels receives a digital output signal from a controller (such as a PLC, microcontroller, or I/O card) via the 50-pin ribbon cable. When a control signal is activated, the corresponding relay energizes, switching its contacts to control the connected load circuit.
The SPDT relay configuration allows each channel to be wired for either normally open (NO) or normally closed (NC) operation, providing flexibility for various control strategies. The isolation between control and load circuits ensures that high-voltage transients or faults on the load side do not affect the control electronics.
Typical Use Cases:
- Industrial automation and process control systems
- PLC digital output expansion panels
- Machine control and equipment interfacing
- Signal switching and load control in test benches
- Building automation (lighting, HVAC, and access control)
- Laboratory and R&D instrumentation requiring isolated switching
Compatibility:
The AX756A is compatible with standard 50-pin digital output interfaces used by many PLC and DAQ systems, including Axiom, Advantech, National Instruments, and similar manufacturers. The included 1 m ribbon cable simplifies direct connection to controller output ports without additional wiring.
5. Components & Accessories
Included Items:
- AX756A 24-channel relay panel
- 1 m flat ribbon cable with 50-pin connector (pre-terminated)
- Integrated 2 × 18 dual terminal blocks for field wiring
- Mounting holes for panel installation
Optional Accessories:
- DIN-rail mounting kit (for vertical or horizontal installation)
- Replacement ribbon cables (various lengths)
- Protective cover or enclosure for harsh environments
- Relay replacement kits (for maintenance or extended service life)
Connectors:
- Input Connector: 50-pin male header (standard digital output interface)
- Output Terminals: 2 × 18 dual terminal blocks (screw-type or spring-clamp, depending on version)
- Cable Type: 1 m flat ribbon cable, 50-pin IDC connector
6. Installation & Setup
Requirements:
- Compatible digital output controller or PLC with 50-pin interface
- Power supply suitable for relay coil voltage (typically provided by the controller)
- Proper grounding and isolation practices to ensure safety and signal integrity
Mounting Options:
- Direct panel mounting using pre-drilled holes
- Optional DIN-rail mounting with accessory brackets
Configuration Steps:
1. Mount the AX756A securely in the control cabinet or on a DIN rail.
2. Connect the 50-pin ribbon cable between the controller’s digital output port and the AX756A input connector.
3. Wire the load circuits to the terminal blocks, observing correct polarity and voltage ratings.
4. Verify that all connections are secure and that the load current does not exceed 2 A per channel.
5. Power on the control system and test each relay output for proper operation.
Safety Considerations:
- Ensure isolation between control and load circuits is maintained.
- Do not exceed the rated voltage or current per channel.
- Follow local electrical codes and safety standards during installation.
7. Performance & Capabilities
Switching Performance:
- Each relay channel can switch up to 125 V AC at 2 A, suitable for low- to medium-power loads.
- SPDT contacts allow flexible control configurations (NO/NC).
- Fast switching response suitable for typical industrial control cycles.
Capacity:
- 24 independent channels enable simultaneous control of multiple devices or circuits.
- High-density design optimizes space utilization in control panels.
Efficiency:
- Low coil power consumption per relay minimizes overall system power draw.
- Galvanic isolation reduces interference and improves signal integrity.
Limitations:
- Not intended for high-current or high-voltage switching beyond 125 V AC / 2 A.
- Relay switching speed limited by mechanical contact operation (not suitable for high-frequency switching).
- Requires appropriate suppression (snubber or flyback diode) for inductive loads to extend relay life.
8. Standards & Compliance
Certifications and Compliance:
- Designed in accordance with industrial control equipment standards (IEC/EN 60947-5-1 for electromechanical control devices).
- Meets CE requirements for electromagnetic compatibility (EMC) and low-voltage directives.
- RoHS compliant – free from hazardous substances such as lead, mercury, and cadmium.
- Manufactured under ISO 9001 quality management standards.
Industry Standards:
- Compatible with standard 50-pin digital I/O pinouts (e.g., SCSI-type interface).
- Relay components conform to UL and VDE safety standards for electrical switching devices.
9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 12 months from date of purchase) covering defects in materials and workmanship.
Support:
- Technical documentation, wiring diagrams, and pinout charts available from Axiom’s support portal.
- Application engineering support for integration with PLCs and automation systems.
Maintenance:
- Periodic inspection recommended to ensure relay contacts remain clean and functional.
- Replace relays after rated mechanical or electrical life cycles for optimal reliability.
- Keep terminals and connectors free from dust and corrosion.
Updates & Revisions:
- The AX756A may be subject to periodic design updates to improve performance or compatibility.
- Firmware or configuration updates are not required, as the device operates as a passive relay interface.
Service Life:
- Typical relay mechanical life: >10⁶ operations (no load)
- Electrical life: dependent on load type and switching frequency
Environmental Considerations:
- Designed for use in standard industrial environments.
- For outdoor or high-humidity applications, use within a protective enclosure.
Summary
The Axiom AX756A Isolated 24 DO Relay Panel (120 VAC) is a robust, high-density relay output interface designed for industrial automation and control systems. With 24 isolated SPDT relay channels, each rated for 125 V AC and 2 A, it provides safe and flexible switching for a wide range of loads. The inclusion of a 1 m 50-pin ribbon cable and dual terminal blocks simplifies integration with PLCs and digital output modules. Compact dimensions (220 × 132 × 15 mm) and industrial-grade construction make it ideal for space-constrained control cabinets.
Engineered for reliability, safety, and ease of use, the AX756A delivers consistent performance across diverse applications—from factory automation to building management systems—while maintaining compliance with international standards for electrical and environmental safety.
Product Name: Isolated 24 DO Relay Panel (120 VAC)
Model: AX756A
Series: AX Series – Digital Output Relay Interface Modules
Article Number: AX756A
Manufacturer: Axiom
The Axiom AX756A is a high-performance, isolated 24-channel digital output (DO) relay panel designed for industrial automation, control systems, and signal switching applications. It provides galvanic isolation between control logic and high-voltage output circuits, ensuring safe and reliable operation in demanding environments. The panel supports up to 24 relay outputs, each capable of switching AC loads up to 125 V AC at 2 A. With its compact form factor, robust construction, and standardized 50-pin ribbon cable interface, the AX756A integrates seamlessly into PLC, DCS, and I/O expansion systems.
2. Key Features
- 24 Isolated Relay Outputs: Provides 24 independent relay channels for digital output control, enabling simultaneous switching of multiple loads.
- High Voltage and Current Capacity: Each relay channel supports up to 125 V AC at 2 A, suitable for controlling solenoids, contactors, lamps, and other AC-driven devices.
- Changeover (SPDT) Contacts: Each relay features a single-pole double-throw (SPDT) configuration, offering both normally open (NO) and normally closed (NC) contact options for flexible circuit design.
- Electrical Isolation: Full galvanic isolation between control and output circuits enhances system safety and prevents ground loops or interference.
- Compact Design: Measuring 220 mm × 132 mm × 15 mm, the panel offers high channel density in a slim profile suitable for control cabinets and DIN-rail installations.
- Convenient Wiring Interface: Equipped with 2 × 18 dual terminal blocks for easy connection of field wiring, simplifying installation and maintenance.
- Standardized Connectivity: Includes a 1 m flat ribbon cable terminated with a 50-pin connector, compatible with standard digital output modules and interface boards.
- Industrial-Grade Reliability: Built with high-quality relays and durable materials to ensure long operational life and consistent performance under industrial conditions.
- Versatile Application Range: Ideal for automation systems, process control, machine interfacing, and signal switching in manufacturing, energy, and building automation sectors.
3. Technical Specifications
- Model: AX756A
- Type: Isolated 24-channel digital output relay panel
- Number of Channels: 24 relay outputs
- Relay Type: Electromechanical, SPDT (single-pole double-throw)
- Contact Configuration: Changeover contacts (NO/NC)
- Maximum Switching Voltage: 125 V AC
- Maximum Switching Current: 2 A per channel
- Isolation: Galvanic isolation between control and output circuits
- Control Interface: 50-pin ribbon cable connector (standard pinout for digital output modules)
- Cable Length: 1 m flat ribbon cable included
- Terminal Blocks: 2 × 18 dual terminal blocks for field wiring
- Dimensions: 220 mm (W) × 132 mm (H) × 15 mm (D)
- Weight: Approx. 0.5 kg (typical, depending on configuration)
- Material: Industrial-grade PCB with protective coating; terminal blocks and connectors made of high-durability thermoplastic
- Operating Voltage (Control Side): Typically 5 V DC or 24 V DC logic-level control (depending on connected controller)
- Operating Temperature Range: 0 °C to +55 °C (typical industrial environment)
- Storage Temperature Range: –20 °C to +70 °C
- Humidity: 10 % to 90 % RH, non-condensing
- Mounting: Panel or DIN-rail compatible (with optional mounting accessories)
4. Functionality
The AX756A functions as an interface module between low-voltage digital control signals and high-voltage AC loads. Each of the 24 relay channels receives a digital output signal from a controller (such as a PLC, microcontroller, or I/O card) via the 50-pin ribbon cable. When a control signal is activated, the corresponding relay energizes, switching its contacts to control the connected load circuit.
The SPDT relay configuration allows each channel to be wired for either normally open (NO) or normally closed (NC) operation, providing flexibility for various control strategies. The isolation between control and load circuits ensures that high-voltage transients or faults on the load side do not affect the control electronics.
Typical Use Cases:
- Industrial automation and process control systems
- PLC digital output expansion panels
- Machine control and equipment interfacing
- Signal switching and load control in test benches
- Building automation (lighting, HVAC, and access control)
- Laboratory and R&D instrumentation requiring isolated switching
Compatibility:
The AX756A is compatible with standard 50-pin digital output interfaces used by many PLC and DAQ systems, including Axiom, Advantech, National Instruments, and similar manufacturers. The included 1 m ribbon cable simplifies direct connection to controller output ports without additional wiring.
5. Components & Accessories
Included Items:
- AX756A 24-channel relay panel
- 1 m flat ribbon cable with 50-pin connector (pre-terminated)
- Integrated 2 × 18 dual terminal blocks for field wiring
- Mounting holes for panel installation
Optional Accessories:
- DIN-rail mounting kit (for vertical or horizontal installation)
- Replacement ribbon cables (various lengths)
- Protective cover or enclosure for harsh environments
- Relay replacement kits (for maintenance or extended service life)
Connectors:
- Input Connector: 50-pin male header (standard digital output interface)
- Output Terminals: 2 × 18 dual terminal blocks (screw-type or spring-clamp, depending on version)
- Cable Type: 1 m flat ribbon cable, 50-pin IDC connector
6. Installation & Setup
Requirements:
- Compatible digital output controller or PLC with 50-pin interface
- Power supply suitable for relay coil voltage (typically provided by the controller)
- Proper grounding and isolation practices to ensure safety and signal integrity
Mounting Options:
- Direct panel mounting using pre-drilled holes
- Optional DIN-rail mounting with accessory brackets
Configuration Steps:
1. Mount the AX756A securely in the control cabinet or on a DIN rail.
2. Connect the 50-pin ribbon cable between the controller’s digital output port and the AX756A input connector.
3. Wire the load circuits to the terminal blocks, observing correct polarity and voltage ratings.
4. Verify that all connections are secure and that the load current does not exceed 2 A per channel.
5. Power on the control system and test each relay output for proper operation.
Safety Considerations:
- Ensure isolation between control and load circuits is maintained.
- Do not exceed the rated voltage or current per channel.
- Follow local electrical codes and safety standards during installation.
7. Performance & Capabilities
Switching Performance:
- Each relay channel can switch up to 125 V AC at 2 A, suitable for low- to medium-power loads.
- SPDT contacts allow flexible control configurations (NO/NC).
- Fast switching response suitable for typical industrial control cycles.
Capacity:
- 24 independent channels enable simultaneous control of multiple devices or circuits.
- High-density design optimizes space utilization in control panels.
Efficiency:
- Low coil power consumption per relay minimizes overall system power draw.
- Galvanic isolation reduces interference and improves signal integrity.
Limitations:
- Not intended for high-current or high-voltage switching beyond 125 V AC / 2 A.
- Relay switching speed limited by mechanical contact operation (not suitable for high-frequency switching).
- Requires appropriate suppression (snubber or flyback diode) for inductive loads to extend relay life.
8. Standards & Compliance
Certifications and Compliance:
- Designed in accordance with industrial control equipment standards (IEC/EN 60947-5-1 for electromechanical control devices).
- Meets CE requirements for electromagnetic compatibility (EMC) and low-voltage directives.
- RoHS compliant – free from hazardous substances such as lead, mercury, and cadmium.
- Manufactured under ISO 9001 quality management standards.
Industry Standards:
- Compatible with standard 50-pin digital I/O pinouts (e.g., SCSI-type interface).
- Relay components conform to UL and VDE safety standards for electrical switching devices.
9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 12 months from date of purchase) covering defects in materials and workmanship.
Support:
- Technical documentation, wiring diagrams, and pinout charts available from Axiom’s support portal.
- Application engineering support for integration with PLCs and automation systems.
Maintenance:
- Periodic inspection recommended to ensure relay contacts remain clean and functional.
- Replace relays after rated mechanical or electrical life cycles for optimal reliability.
- Keep terminals and connectors free from dust and corrosion.
Updates & Revisions:
- The AX756A may be subject to periodic design updates to improve performance or compatibility.
- Firmware or configuration updates are not required, as the device operates as a passive relay interface.
Service Life:
- Typical relay mechanical life: >10⁶ operations (no load)
- Electrical life: dependent on load type and switching frequency
Environmental Considerations:
- Designed for use in standard industrial environments.
- For outdoor or high-humidity applications, use within a protective enclosure.
Summary
The Axiom AX756A Isolated 24 DO Relay Panel (120 VAC) is a robust, high-density relay output interface designed for industrial automation and control systems. With 24 isolated SPDT relay channels, each rated for 125 V AC and 2 A, it provides safe and flexible switching for a wide range of loads. The inclusion of a 1 m 50-pin ribbon cable and dual terminal blocks simplifies integration with PLCs and digital output modules. Compact dimensions (220 × 132 × 15 mm) and industrial-grade construction make it ideal for space-constrained control cabinets.
Engineered for reliability, safety, and ease of use, the AX756A delivers consistent performance across diverse applications—from factory automation to building management systems—while maintaining compliance with international standards for electrical and environmental safety.
No manuals/catalogs available.
No accessories available.
