840-A71 Allen‑Bradley Output module

Description

840-A71 Allen‑Bradley Output module

Product Dimensions：

Product Description

Allen-Bradley output modules are critical components in Rockwell Automation’s Programmable Logic Controller (PLC) systems, including platforms like ControlLogix, CompactLogix, SLC 500, and POINT I/O. These modules act as interfaces between the PLC and field devices, converting digital signals from the controller into actionable outputs to drive devices such as actuators, relays, solenoids, motors, and indicator lights. Available in digital and analog variants, they cater to diverse industrial automation needs with high reliability and flexibility.

Product Specifications

Below are specifications for some commonly used Allen-Bradley output modules, based on available models:

1. 1756-OA8D (ControlLogix Digital Output Module)

• Output Type: Discrete, digital

• Number of Outputs: 8

• Operating Voltage: 24 VDC

• Maximum Current per Channel: 50 mA

• Load Capacity: 250 VA

• Communication Interface: ControlNet

• Operating Temperature: -20°C to +60°C

• Features: Advanced diagnostics, configurable outputs, compact design

• Certifications: UL, CSA, CE

2. 1746-OB32 (SLC 500 Digital DC Output Module)

• Output Type: Sourcing (positive logic)

• Number of Outputs: 32

• Output Voltage Range: 10–50 VDC

• Output Current: 0.5 A per point, 4 A per side, 8 A total per module

• Isolation Voltage: 1500 V RMS (field to logic)

• Backplane Current Draw: 200 mA @ 5 VDC

• Response Time: Turn ON: 0.1 ms; Turn OFF: 1.0 ms

• Operating Temperature: 0°C to 60°C

• Connection Type: 40-pin removable terminal block

• Certifications: UL, CSA, CE

3. 1769-OF4 (CompactLogix Analog Output Module)

• Output Type: Analog

• Number of Outputs: 4 channels

• Output Range: 0–10 VDC or 4–20 mA (selectable per channel)

• Resolution: 16-bit

• Output Accuracy: ±0.5% (voltage), ±0.2% (current)

• Power Consumption: 35 mA @ 5 VDC

• Operating Temperature: 0°C to 60°C

• Mounting Type: DIN rail or panel mount

• Dimensions: 118.5 mm x 45 mm x 70 mm

4. 1771-OA (PLC-5 Digital AC Output Module)

• Output Type: AC output

• Number of Outputs: 8

• Voltage Range: 92–138 VAC, 47–63 Hz

• Nominal Voltage: 120 VAC

• Max Current per Output: 1.5 A

• Max Current per Module: 6 A

• Surge Current: 4 A per channel for 8.3 ms

• Backplane Current: 210 mA @ 5 VDC

• Signal Delay: AC: 45 ±15 ms; DC: 50 ms

• Mounting: Rack-mountable with 1771-WA wiring arm

5. 1734-OB8 (POINT I/O Digital Output Module)

• Output Type: Sourcing, digital

• Number of Outputs: 8

• Operating Voltage: 24 VDC

• Operating Temperature: -20°C to +55°C

• Features: Compact, modular design for distributed control

Product Advantages

1. High Reliability: Designed for harsh industrial environments with robust construction and wide operating temperature ranges.

2. Flexibility: Configurable outputs (e.g., voltage or current for analog modules, sourcing or sinking for digital) to suit diverse applications.

3. High Density: Modules like the 1746-OB32 offer up to 32 outputs, reducing panel space requirements.

4. Advanced Diagnostics: Real-time monitoring and diagnostics (e.g., 1756-OA8D) minimize downtime by enabling proactive maintenance.

5. Seamless Integration: Compatible with Allen-Bradley PLC systems and third-party devices, supporting protocols like ControlNet and EtherNet/IP.

6. Ease of Installation: Features like removable terminal blocks (1746-OB32) and DIN-rail mounting (1769-OF4) simplify setup.

7. Fast Response Times: Critical for time-sensitive applications, with modules like the 1746-OB32 offering 0.1 ms turn-on time.

8. Safety and Compliance: Certified to UL, CSA, and CE standards, ensuring safe operation in industrial settings.

Precautions

1. Proper Installation: Follow manufacturer guidelines for wiring and installation to prevent equipment damage or impaired protection. Ensure trained personnel handle setup per applicable codes and standards.

2. Environmental Conditions: Operate within specified temperature ranges (e.g., 0°C to 60°C for 1769-OF4) to avoid performance issues.

3. Power Supply: Verify that the power supply matches the module’s voltage and current requirements to prevent overload or failure (e.g., 24 VDC for 1734-OB8).

4. Surge Protection: For modules like the 1771-OA, account for surge currents to ensure stable operation under transient conditions.

5. Module Compatibility: Confirm compatibility with the PLC chassis and firmware to avoid integration issues.

6. Maintenance: Regularly check diagnostic feedback (where available) to address potential faults early and avoid downtime.

7. Safety Considerations: Adhere to safety guidelines (e.g., Allen-Bradley SGI-1.1) to mitigate risks of personal injury or equipment damage in hazardous environments.

Product Applications

Allen-Bradley output modules are used across various industries for precise control and automation:

1. Industrial Automation: Controlling actuators, motors, and valves in manufacturing plants (e.g., 1769-OF4 for precise analog control).

2. Material Handling: Managing conveyor systems and sorting equipment with high-density modules like the 1746-OB32.

3. Process Control: Regulating processes in industries like oil and gas, chemical, or food and beverage with reliable AC/DC outputs (e.g., 1771-OA).

4. Packaging Machinery: Driving solenoids and relays for high-speed packaging lines.

5. Motion Control: Synchronizing devices in integrated motion systems using encoder output modules like the 2198-ABQE for applications such as line-scan vision systems.

6. Production Lines: Supporting machinery control in automotive and electronics manufacturing for consistent performance.

For additional details or specific model inquiries, contact Rockwell Automation or authorized distributors.

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