Allen-Bradley 1746-OB16E SLC 500 Digital DC Output Module

Product Overview

The Allen-Bradley 1746-OB16E acts as a high-density, sourcing digital DC output module within the SLC 500 controller platform. This 16-channel card interfaces the central PLC directly with high-current field components, such as heavy-duty solenoids, motor starter coils, and indicator panels. The module includes integrated electronic short-circuit and overcurrent protection, protecting internal solid-state switches from field wiring faults.

Technical Specifications

Engineering Advantages

• Manages High-Amperage Loads Direct from PLC: The module switches continuous currents up to 1.0 Amp per point and handles up to 9.0 Amps total module current at 30 °C. This high capacity drives heavy DC actuators directly, eliminating the need for intermediate interposing relays.

• Prevents Damage via Electronic Protection: The "E" designation signifies built-in electronic short-circuit protection. This circuitry detects downstream short circuits instantly, opening the affected channel before high-energy faults damage the internal circuit trace or the output transistors.

• Optimizes Backplane Power Efficiency: The internal board draws only 135 mA from the 5V DC chassis backplane power supply. This low consumption leaves ample power headroom for adjacent analog or communications modules in the same rack.

• Accelerates Turn-Off Execution: The card achieves a rapid turn-off step response of 2.5 milliseconds. This fast decay time ensures precise positioning and repeatable timing for fast-cycling industrial processes like packaging or sorting.

FAQs

• What does the "E" suffix mean in the 1746-OB16E part number?

  The "E" indicates that this module features electronically protected outputs. The card actively monitors load currents and automatically shuts down a specific channel during short circuits or thermal overloads to protect itself.

• Do you sell this SLC 500 component as a 100% brand new item?

  Yes. We guarantee this 1746-OB16E arrives in 100% brand new, original factory-sealed packaging. It contains no refurbished components or surplus stock.

• Can I wire sinking-type field devices to this output card?

  No. The 1746-OB16E utilizes a sourcing architecture, meaning it supplies positive voltage (10-30V DC) from the module terminal to the field load. Your field devices must connect to the negative DC common rail to complete the circuit.

• What precautions should I take regarding total module current limits?

  While individual points can handle up to 1.0 Amp, you must monitor total simultaneous loads so that the entire module current does not exceed 8.0 Amps under standard conditions (or 9.0 Amps at 30 °C) to prevent thermal degradation.