Definitive Guide to Analog Output Wiring for Allen-Bradley 1734 PLC

Analog outputs are essential components in industrial control systems, allowing programmable logic controllers (PLCs) to interact with analog devices such as actuators, sensors, and controllers. The Allen-Bradley 1734 Analog Output Module is a versatile and widely used device for this purpose, providing accurate and reliable analog signal generation.

Understanding Analog Output Wiring

Analog outputs convert digital signals from the PLC into a continuous analog signal, which is then used to control an external device. The 1734 module supports various output types, including voltage, current, and pulse-width modulation (PWM).

Wiring Considerations

Proper wiring is crucial for accurate and reliable analog output operation. Consider the following factors:

• Wiring Gauge: Use appropriate wire gauge for the voltage and current requirements of the analog output signal.
• Shielding: Use shielded cables for long runs or in areas with electrical noise to minimize interference.
• Grounding: Ensure proper grounding to minimize ground loops and maintain signal integrity.

Step-by-Step Analog Output Wiring Procedure

Materials Required:

• 1734 Analog Output Module
• Appropriate gauge and shielded cables
• Wire strippers and crimpers
• Terminal screwdriver

Procedure:

1. Power Down the System: Turn off the power to the PLC and any connected devices.
2. Wire Ground Terminal: Connect the ground wire to the "GND" terminal on the module.
3. Wire Output Channel Terminals: Identify the desired output channel on the module and connect the signal wires accordingly.
   - Voltage Output: Connect the positive output wire to the "+" terminal and the negative output wire to the "-" terminal.
   - Current Output: Connect the output wire to the "IA" or "IB" terminal.
   - PWM Output: Connect the output wire to the "OUT" terminal.
4. Wire Positive Power Supply Terminal: Connect the positive power supply wire to the "+" terminal on the module.
5. Wire Negative Power Supply Terminal: Connect the negative power supply wire to the "-" terminal on the module.
6. Secure Wire Connections: Tighten the terminal screws firmly to ensure secure connections.
7. Power Up the System: Turn on the power to the PLC and connected devices.

Common Mistakes to Avoid

• Incorrect Wiring: Double-check all connections to ensure they correspond to the correct output channel and terminals.
• Incorrect Power Supply Voltage: Verify that the power supply voltage matches the specified range for the analog output module.
• Grounding Issues: Ensure proper grounding to avoid ground loops and signal disturbances.
• Interference: Use shielded cables for longer wire runs and in areas with potential electrical noise.

Benefits of Analog Output Wiring

• Precise Control: Analog outputs provide precise control over external devices, allowing for fine-tuning of processes.
• Flexibility: Supports multiple output types, enabling compatibility with various devices.
• Signal Isolation: Some modules offer isolated outputs, protecting the PLC from potential damage due to external electrical faults.
• Cost-Effective: Analog output modules are relatively cost-effective compared to discrete output modules.

Frequently Asked Questions

1. What is the maximum output current for the 1734 Analog Output Module?
   - The maximum output current is 20 mA for current outputs.

2. Can the 1734 module generate PWM signals?
   - Yes, the 1734 module supports PWM output via the "OUT" terminal.

   

3. What is the resolution of the analog output signals?
   - The resolution varies depending on the module type, typically ranging from 8 to 16 bits.

4. How do I troubleshoot analog output issues?
   - Check the wiring connections, verify power supply voltage, and examine the output signal using an oscilloscope or multimeter.

5. What are some applications for Allen-Bradley analog output modules?
   - Controlling motors, actuators, temperature sensors, and process control loops.

6. How do I convert a digital signal to an analog signal using the 1734 module?
   - The module performs the digital-to-analog conversion internally based on the input digital value and the output range.

7. What is the wiring diagram for a 1734 analog output module?
   - Refer to the manufacturer's documentation for specific wiring diagrams and terminal assignments.

8. Where can I access additional resources for analog output wiring?
   - Allen-Bradley technical manuals, online forums, and training materials provide valuable information and support.

   

Conclusion

Analog output wiring is a critical aspect of PLC-based control systems. By understanding the principles, following the step-by-step procedure, and avoiding common mistakes, engineers can ensure accurate and reliable analog output operation. The benefits of using Allen-Bradley 1734 Analog Output Modules, such as precise control, flexibility, and cost-effectiveness, make them an essential tool for industrial automation applications.