Product Overview

The Allen-Bradley 1746-NO4V is an analog output module for the SLC 500 platform. This module features four non-isolated output channels. Output voltage range spans -10 to +10 VDC. Full scale output reaches 10 VDC for each channel. Conversion method uses an R-2R ladder network. The 1746-NO4V mounts on a 1746 chassis and uses a removable terminal block (RTB). Backplane current draw measures 55 milliamps at 5 Volts. At 24 Volts, backplane current draw reaches 145 milliamps. An external 24 VDC power supply may be used by activating SW1 external. However, if backplane power proves sufficient, it can serve as the module's power source instead. Factory calibration eliminates user adjustment. The Allen-Bradley 1746-NO4V communicates using a 16-bit two's complement binary format.

Technical Specifications

General Specifications

Output Specifications

Power & Backplane Specifications

Environmental Specifications

Physical Specifications

Four Analog Output Channels

The 1746-NO4V provides four analog output channels for voltage signal generation. Each channel produces -10 to +10 VDC signals with full scale output of 10 VDC. Resolution reaches 14 bits for precise analog control. Voltage output coding spans -32,768 to +32,764 in 16-bit two's complement format. Conversion uses an R-2R ladder network for accuracy. Consequently, the Allen-Bradley 1746-NO4V delivers high-quality analog signals for control applications.

Update Time & Step Response

Update time measures 512 microseconds for all channels in parallel. This fast update ensures simultaneous output changes across all four channels. Step response reaches 2.5 milliseconds at 95% of final value. For dynamic control loops, this response speed proves adequate. The 1746-NO4V supports PID controller outputs, mathematical operation results, and HMI or SCADA entered values.

Power Options

Backplane current draw measures 55 mA at 5 Volts and 145 mA at 24 Volts. An external 24 VDC power supply may be used with this module. Activate SW1 external when using an external supply. If backplane power proves sufficient, you may use it as the module's power source instead. For power budgeting, the Allen-Bradley 1746-NO4V offers flexible sourcing options.

Isolation & Load Specifications

Field wiring to backplane isolation reaches 500 Volts DC for safety. Maximum load reactance measures 1 µF for capacitive loads. Maximum load current reaches 10 mA per channel. For signal conditioning, stay within these limits. The 1746-NO4V drives standard analog input devices and recorders reliably.

Factory Calibration

This module comes factory calibrated and requires no user adjustment. The 16-bit two's complement binary communication format ensures compatibility with SLC 500 systems. Overall accuracy drift measures ±54 ppm per degree Celsius full scale. For temperature stability, the Allen-Bradley 1746-NO4V maintains accuracy across its operating range.

Removable Terminal Block

A removable terminal block (RTB) simplifies field wiring connections. Recommended wire size is #14 AWG maximum for reliable connections. Limit a maximum of two wires terminated in the same terminal. This practice provides room for troubleshooting and allows closure of the module cover. For maintenance, the RTB allows module removal without disturbing field wiring. The 1746-NO4V simplifies installation and servicing.

LED Status Indicator

An LED status indicator provides visual feedback of module operation. The LED indicates proper power and communication status. For troubleshooting, this indicator helps identify module issues quickly. The Allen-Bradley 1746-NO4V reduces diagnostic time with clear visual feedback.

Slot Selection Guidelines

For electrical noise considerations, install the module away from AC or high levels of DC voltage. Additionally, install this module away from the system power supply. For ambient temperature, the chassis nearest to the enclosure bottom is recommended. These practices maximize analog signal integrity. Consequently, the 1746-NO4V performs best with careful slot selection.

Removal Under Power Restriction

This module does not support removal under power. Never remove this module when power is applied. Electrical arcs may occur, causing damage to the electronic circuitry. For safety and reliability, always power down before removal. The Allen-Bradley 1746-NO4V requires proper power-off procedures.

Application Examples

Analog outputs may be assigned to PID controller outputs for process control. Mathematical operation results can drive analog outputs directly. Manual values entered from HMI or SCADA systems also work. Signal retransmission for reference to other devices enables monitoring and recording applications. For stand-alone controllers requiring control coordination (such as load sharing), analog outputs send reference signals. The 1746-NO4V serves diverse analog control applications.

Installation Guidelines

Follow these steps for proper installation of the 1746-NO4V.

1. Power down the SLC 500 system completely before handling the module.

2. Select an appropriate chassis slot away from AC power and the system power supply.

3. Align the module with the card guides inside the selected slot.

4. Slide the 1746-NO4V firmly into place until the backplane connectors engage.

5. Secure the module using the retaining screws at top and bottom.

6. Connect field wiring to the removable terminal block using #14 AWG wire maximum.

7. Set SW1 for either backplane power or external 24 VDC supply.

8. Install the RTB onto the module front panel after wiring.

9. Power up the system and verify the LED status indicator illuminates.

Note: The 1746-NO4V does not support removal under power. Always power down before removing the module. Maximum load current is 10 mA per channel. Maximum load reactance is 1 µF. Use shielded cable for analog outputs to minimize noise pickup.

Packaging List

• One Allen-Bradley 1746-NO4V Analog Output Module

• One removable terminal block (RTB)

• One product installation manual

• One anti-static protective bag

Common FAQs

1. What is the output voltage range of the 1746-NO4V?

Output voltage ranges from -10 to +10 VDC for each of the four channels. Full scale output reaches 10 VDC. Resolution reaches 14 bits for precise analog control. Voltage output coding spans -32,768 to +32,764 in 16-bit two's complement format. For bipolar analog output applications, the Allen-Bradley 1746-NO4V provides the required -10 to +10 VDC range.

2. What is the update time of the 1746-NO4V?

Update time measures 512 microseconds for all channels in parallel. This fast update ensures simultaneous output changes across all four channels. Step response reaches 2.5 milliseconds at 95% of final value. For dynamic control loops, the Allen-Bradley 1746-NO4V provides adequate response speed for most process applications.

3. Does the 1746-NO4V require an external power supply?

Backplane power may be sufficient for many applications. However, an external 24 VDC power supply may be used by activating SW1 external. For power budgeting, the 1746-NO4V offers flexible sourcing options. Backplane current draw measures 55 mA at 5 Volts and 145 mA at 24 Volts.

4. What is the maximum load current of the 1746-NO4V?

Maximum load current reaches 10 mA per channel. Maximum load reactance measures 1 µF for capacitive loads. For signal conditioning and driving analog inputs, stay within these limits. The Allen-Bradley 1746-NO4V drives standard analog input devices and recorders reliably.

5. Can I remove the 1746-NO4V while power is applied?

No, this module does not support removal under power. Never remove this module when power is applied. Electrical arcs may occur, causing damage to the electronic circuitry. For safety and reliability, always power down before removal. The Allen-Bradley 1746-NO4V requires proper power-off procedures for maintenance.

Why Choose This Analog Output Module?

The Allen-Bradley 1746-NO4V delivers reliable analog voltage output for SLC 500 systems. Four channels with -10 to +10 VDC range suit bipolar control applications. Fourteen-bit resolution provides precise analog signal generation. Fast 512 µs update time and 2.5 ms step response support dynamic control loops. Factory calibration eliminates user adjustment. The removable terminal block simplifies wiring and maintenance. For SLC 500 systems requiring analog voltage outputs, choose the 1746-NO4V.