Allen-Bradley 1762-OB16 MicroLogix 1200 16-Point DC Output

Sixteen 24V DC source outputs for MicroLogix 1200

The Allen-Bradley 1762-OB16 is a MicroLogix 1200 solid-state output expansion module with sixteen 24V DC sourcing outputs on a single common. It adds sixteen digital outputs for solenoids, contactor coils, indicator lamps and other 24V DC loads to a MicroLogix 1200 controller, and it plugs into the expansion bus through the ribbon cable fitted to the module.

Each point is rated 0.5 A at 55 °C or 1.0 A at 30 °C. The whole module can supply 4.0 A at 55 °C or 8.0 A at 30 °C. Switching is quick for a solid-state module: 0.1 ms on and 1.0 ms off for a resistive load.

Technical specifications

Loading and protection notes

Outputs operate from 20.4 to 26.4V DC. In the off state each output leaks up to 1.0 mA, and the minimum load current is 1.0 mA. The on-state voltage drop is at most 1.0V DC. Surge current is limited to 2.0 A for a 10 ms duration, with a repetition rate of once every 2 seconds at 55 °C or once per second at 30 °C, which matters when switching lamp or inductive loads.

The module draws up to 175 mA at 5V DC from the expansion bus. It has one green health indicator and four red error indicators on the front. Terminals are screw type for 0.33 to 2.08 mm² (22 to 14 AWG) solid wire or 0.33 to 1.31 mm² (22 to 16 AWG) stranded wire.

Related MicroLogix 1200 output modules

Rockwell Automation publishes separate installation instructions for the other 1762 output modules, including the 1762-OB8 and the 1762-OW16 relay module. Choose the OB16 when all loads are 24V DC and sourcing.

Related Allen-Bradley products: Allen-Bradley 1756-OB32 ControlLogix 32-Point DC Output, Allen-Bradley 1756-OB16E ControlLogix 16-Point DC Output Module, Allen-Bradley 1756-OA16 ControlLogix 16-Point AC Output Module, Allen-Bradley 1756-IB16 ControlLogix 16-Point DC Input Module, Allen-Bradley 5094-OB16 FLEX 5000 16-Point DC Output Module and Allen-Bradley 1756-IA16 ControlLogix 16-Point AC Input Module.

Documents and quotation

The Rockwell Automation installation instructions for the 1762-OB16 are attached. See our PLC and I/O cards catalogue for related controllers and I/O. Confirm the exact catalog number, series letter and firmware or hardware revision on the product label, and the compatibility with your existing system, before ordering. Stock and lead time are confirmed at quotation.

How the 1762-OB16 Works

The 1762-OB16 uses solid-state switches to source current from the 24V DC supply connected to the module to each load, with the load returning to the supply common. When the controller sets an output bit, the corresponding transistor turns on. Because there are no contacts, switching is fast and there is no contact wear, which suits loads that cycle often. The trade-offs are a small on-state voltage drop and a small off-state leakage current, as listed in the specifications above. The module receives its logic power and data from the controller expansion bus through the ribbon cable.

1762-OB16 Selection & Ordering Guide

• Point count: the 1762-OB8 provides eight sourcing outputs, while the 1762-OB16 offers sixteen.
• Output type: for AC loads or mixed voltages choose the 1762-OW16 relay module; for 24V DC sourcing loads the 1762-OB16 is appropriate.
• Current budget: check per-point and total module current against the temperature derating, and use interface relays for large loads.
• Controller: Bulletin 1762 expansion I/O is listed with MicroLogix controllers in the MicroLogix selection guide; check the expansion limits and bus power budget.
• Inputs: the 1762-IQ16 is the matching sixteen-point 24V DC input module.

When you request a quote for the 1762-OB16, include the series letter from the module label. Our team can help confirm the correct ordering code.

Installation & Maintenance

Disconnect power before connecting the expansion cable or removing the module. Mount it beside the controller or the previous expansion module, protect the 24V DC supply to the module with a fuse or breaker, and fit a suppression diode across DC coils. Route output wiring away from analog signal cables. During maintenance, compare output indicators with the program state, check the supply voltage under load and inspect terminals for tightness and discoloration.

Typical Applications in Oman & the GCC

• Pump, valve and alarm control in water and wastewater panels.
• Solenoid valves and indicator lamps on packaging and food machines.
• Building services, ventilation and HVAC control panels.
• Small oil and gas utility skids running a MicroLogix controller.

Keep the enclosure within the 0 to 55 °C operating range in hot plant rooms.

When commissioning a panel that uses the 1762-OB16, force each output from the programming software with the load disconnected or isolated, confirm the correct indicator lights and the correct field device responds, and record the results on the loop check sheet before handing the system over.

Why Source the 1762-OB16 from Seven Star LLC

Seven Star LLC supplies Allen-Bradley MicroLogix expansion I/O, including the 1762-OB16, across Oman and the GCC. Request a quote with the catalog number and quantity.