1756-L73K Allen‑Bradley Programmable controller

Description

1756-L73K Allen‑Bradley Programmable controller

Product Dimensions：

Product Description

The Allen-Bradley 1756-OF8H is an advanced ControlLogix 8-point analog output module with HART (Highway Addressable Remote Transducer) communication protocol, designed for industrial automation applications requiring precise and reliable output control. This module, part of the ControlLogix series by Rockwell Automation, provides eight configurable voltage or current output channels and supports advanced diagnostics and communication with HART-enabled devices. It is ideal for high-performance systems where precise analog control and field device communication are critical.

Product Specifications

• Manufacturer: Rockwell Automation / Allen-Bradley

• Series: ControlLogix

• Module Type: Analog Output Module with HART capability

• Output Channels: 8 differential outputs

• Output Signals:

  • Current: 0–20 mA, 4–20 mA

  • Voltage: ±10 VDC (-10.4336 to +10.4336 V)

• Resolution: 15–16 bits

• Accuracy:

  • Voltage: ±0.1% of range at 25 °C (77 °F) with HART disabled

  • Current: ±0.15% of range at 25 °C (77 °F) with HART disabled

• HART Modem: 1 per module

• Backplane Current:

  • 230 mA at 5.1V DC

  • 230 mA at 24V DC

• Update Time:

  • Current (no HART): <23 ms to 95% with resistive loads

  • Current (with HART): <37 ms to 95% with resistive loads

  • Voltage: <8.5 ms to 95% with resistive loads

• Data Format: Integer mode (left justified, 2’s complement), IEEE 32-bit floating point

• Isolation Voltage: 50V (continuous), basic insulation type, output channels to backplane; no isolation between individual output channels

• Overvoltage Protection: ±24 VDC max

• Terminal Blocks: 1756-TBNH, 1756-TBSH, 1756-TBCH

  • Single wire connection: 0.33–2.1 mm² (22–14 AWG) solid or stranded copper wire, rated at 105 °C (221 °F) or greater, 1.2 mm (3/64 in.) insulation maximum

  • Double wire connection: 0.33–1.3 mm² (22–16 AWG) solid or stranded copper wire

• Conversion Method: Successive approximation (input), R-Ladder DAC (output)

• Open Circuit Detection: For current output only (output must be set to <0.1 mA)

• Dimensions: 60 mm x 150 mm x 110 mm

• Weight: Approximately 17 lb (7.7 kg)

• Enclosure: Open

• Certifications: Certified as of 2025-07-19 (products sold before or after may carry different certifications; check product label)

• Electromagnetic Compatibility:

  • 10 V/m with 1 kHz sine-wave 80% AM from 80–2000 MHz

  • 10 V/m with 200 Hz 50% pulse 100% AM at 900 MHz and 1890 MHz

  • 3 V/m with 1 kHz sine-wave 80% AM from 2000–2700 MHz

Product Advantages

1. High Precision and Resolution: Offers 15–16-bit resolution with excellent signal accuracy (0.1% for voltage, 0.15% for current), ensuring reliable control in demanding applications.

2. HART Communication: Integrated HART modem enables advanced diagnostics, configuration, and communication with smart field devices, enhancing system efficiency.

3. Flexible Output Options: Supports both voltage (±10 VDC) and current (0–20 mA, 4–20 mA) outputs, allowing compatibility with a wide range of devices.

4. Fast Response Times: Rapid update rates (as low as 8.5 ms for voltage outputs) make it suitable for high-speed automation processes.

5. Robust Design: Overvoltage protection (±24 VDC) and high isolation voltage (50V continuous) ensure durability in harsh industrial environments.

6. Ease of Integration: Compatible with the ControlLogix platform, with removable terminal blocks for simplified wiring and maintenance.

7. Real-Time Diagnostics: On-board data alarming and real-time channel sampling provide immediate feedback for system monitoring and troubleshooting.

Precautions

1. Wiring Requirements: Use only specified wire sizes (0.33–2.1 mm² for single, 0.33–1.3 mm² for double) and ensure proper insulation (1.2 mm max) to prevent connection issues or electrical faults.

2. Environmental Conditions: Operate in an open enclosure with proper ventilation to avoid overheating. Ensure compliance with temperature ratings (wire rated at 105 °C or greater).

3. HART Communication Delays: When all eight channels have HART enabled, update times may increase (up to 10 seconds), which could affect time-critical applications.

4. Certification Verification: Check the product label for certifications, as products sold before or after July 19, 2025, may have different certifications.

5. Firmware Compatibility: Ensure the module’s firmware is compatible with your application, as PDF Supply notes that firmware is not guaranteed with surplus products. Obtain firmware from authorized Rockwell Automation sources.

6. No Isolation Between Channels: There is no isolation between individual output channels, so take care to avoid interference in sensitive applications.

7. Open Circuit Detection: Available only for current outputs set to <0.1 mA; ensure proper configuration to utilize this feature.

Product Applications

The 1756-OF8H is suited for a variety of industrial automation applications, including:

• Process Control: Used in industries like oil and gas, chemical processing, and water treatment for precise control of valves, actuators, and other analog devices.

• Manufacturing Automation: Controls machinery and equipment requiring accurate voltage or current signals, such as in automotive or food and beverage production.

• HART Device Integration: Ideal for systems requiring communication with HART-enabled field devices, such as transmitters and sensors, for real-time diagnostics and configuration.

• High-Speed Systems: Suitable for applications needing rapid analog output updates, such as motion control or dynamic process adjustments.

• Industrial IoT and Smart Factories: Supports advanced automation systems with HART communication for data-driven decision-making and predictive maintenance.

For further technical documentation, visit the Rockwell Automation Technical Documentation Center or Literature Library.

Shipping Port: Xiamen, China

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