1746-NO41

Overview of Allen Bradley 1746-NO4I

The Allen Bradley 1746-NO4I is a four-channel analog output module designed for integration with SLC 500 series programmable logic controllers (PLCs). This unit provides precise current output, used for transmitting control signals to actuators, drives, and other field devices that require analog commands. With each channel capable of sourcing a 0 to 20 mA signal (full scale 21 mA), the 1746-NO4I serves a wide range of industrial automation needs. Its rapid update time and high resolution make it suitable for applications where speed and accuracy are essential. The module draws 55 mA at 5 V DC and 195 mA at 24 V DC from the backplane, and is engineered to operate reliably in demanding environments with temperatures from 0 to 60°C. Factory calibration and built-in status indication through an onboard LED increase operational confidence and simplify diagnostics. Compatible exclusively with the 1746 chassis, this output card is a key choice for system integrators scaling SLC 500 installations.

Key Features of Allen Bradley 1746-NO4I

• Four current output channels (0 to 20 mA, full scale 21 mA)
• 14-bit resolution for fine signal control
• Fast 512 microseconds update time
• Overrange capability to 21 mA (5% over full scale)
• Selectable internal/external power supply (24 V DC ±10%)
• LED status indicator per module
• Backplane isolation up to 500 V DC
• Removable terminal block for simplified wiring and replacement

Technical Specs of 1746-NO4I

• Module Type: Analog Output Module
• Channels: 4 (current output)
• Current Output Range: 0 to 20 mA (full scale 21 mA)
• Resolution: 14 bits
• Update Time: 512 μs (all channels)
• Step Response: 2.5 ms
• Backplane Current: 55 mA @ 5 V DC; 195 mA @ 24 V DC
• Isolation: 500 V DC (backplane to user)
• Operating Temperature: 0 to 60°C
• Humidity: 5% to 95% non-condensing
• Load Resistance: 0–500 Ohms
• Compatible Chassis: 1746 series (SLC 500)

Applications / Use Case

The Allen Bradley 1746-NO4I is widely utilized for industrial process automation requiring reliable analog current outputs. Typical applications include sending control signals from PLCs to variable speed drives, proportional valve controllers, analog actuators, and measurement instruments in process plants. With four current channels, the module is ideal for scenarios where multiple feedback or actuator systems must be regulated independently. Common environments are manufacturing lines, water/wastewater treatment, batching systems, and HVAC controls, where accurate analog control is needed for temperature, pressure, flow, or speed modulation. Its compatibility with PID control loops also makes it valuable in systems demanding real-time response and stability. The 1746-NO4I assists in optimizing process efficiency by enabling precise analog output from trusted Allen Bradley SLC 500 PLC architectures.

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