Allen-Bradley 1746-NO4I 4-Point Analog Output Module

Description

Allen-Bradley 1746-NO4I 4-Point Analog Output Module

Product Dimensions：

The Allen-Bradley 1746-NO4I is a high-density analog output module belonging to the SLC 500 family. It is a reliable solution for industrial applications requiring precise control of current-driven field devices.

Product Detailed Description

The 1746-NO4I is a 4-channel analog current output module. It converts digital data from the SLC 500 processor into high-resolution analog current signals. This module is typically used to control devices that require a 4 to 20 mA or 0 to 20 mA signal, such as variable speed drives, pneumatic valves, and actuators.

Technical Parameters

Product Advantages

• High Resolution: The 14-bit resolution ensures smooth and precise control of actuators, minimizing “stepping” in process control.
• Efficient Power Design: The module draws power directly from the SLC backplane, eliminating the need for external power supplies for the module electronics.
• Simplified Configuration: It is easily configured through RSLogix 500 software, allowing for quick scaling of data and range selection.
• Proven Reliability: As part of the SLC 500 platform, it has a decades-long track record of durability in harsh industrial environments.

Important Considerations & Precautions

• Common Grounding: The four output channels share a common signal ground. Ensure that your field devices are compatible with a shared ground to avoid ground loop interference.
• External 24V DC: While the module logic is powered by the backplane, the output loops require a stable 24V DC supply (often sourced from the backplane or an external supply depending on the chassis configuration).
• Load Impedance: Do not exceed the 500 \Omega load limit. Excessive impedance will prevent the module from driving the full 20 mA current, leading to inaccurate control.
• Hot-Swapping: Do not remove or insert this module while the chassis power is applied. Doing so can cause an electrical arc that may damage the module or the backplane.

Product Applications

The 1746-NO4I is widely used in legacy and modernizing SLC systems for:

• Proportional Valve Control: Modulating the position of flow control valves in chemical or water treatment processes.
• Drive Speed Reference: Providing the 4-20mA speed setpoint to Variable Frequency Drives (VFDs).
• Chart Recorders: Sending analog signals to paper or digital data loggers for process documentation.
• Actuators: Controlling dampers in HVAC systems or positioners in heavy machinery.

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