Buy now: Allen-Bradley 1756-OB32 ControlLogix High-Density Output Module
Atlantechdrives provides you the 1756-OB32, a high-density 32-point sourcing DC output module designed for the ControlLogix platform. This module is the ideal solution for large-scale automation projects where chassis space is at a premium, allowing you to control twice the number of field devices in a single slot compared to standard 16-point modules.
- Outputs: 32 Points (16 points per group)
- Voltage Category: 12/24V DC Sourcing
- Operating Voltage: 10-31.2V DC
- Current Rating: 0.5A per point @ 50°C (Max 8A per module)
- Termination: 36-pin Removable Terminal Block (RTB)
Maximizing Cabinet Space with 32-Point Density
The 1756-OB32 is engineered for modern industrial environments that demand scalability. By utilizing high-efficiency output transistors, Allen-Bradley has packed 32 independent sourcing outputs into a single-slot form factor. This high density is perfect for high-speed sorting, bottling lines, and complex assembly cells where dozens of small solenoids, pilot lights, or relay coils need to be managed. The module provides group-to-backplane isolation, ensuring that field-side electrical noise does not interfere with the sensitive logic of the ControlLogix processor. Each of the 32 points features its own status LED on the front panel for rapid visual troubleshooting.
Expert Tips: Managing Thermal Load in High-Density Modules
A common mistake with the 1756-OB32 is overloading the module’s thermal capacity. While each point can handle 0.5A, the entire module is limited to a total of 8A (at 60°C). If you have all 32 points energized simultaneously at their maximum rating, the module will generate significant heat. We recommend staggering the loads or ensuring that the average «on-time» per point is balanced. For high-temperature cabinets, we highly recommend using the 1756-TBS6H (Spring Clamp) RTB to ensure better vibration resistance and thermal dissipation at the connection points.
Maintenance and Diagnostic Verification
The 1756-OB32 is a solid-state module with no moving parts, but its wiring density requires careful maintenance. During routine inspections, use a thermal camera to check the terminal block for hot spots, which can indicate loose connections. In the Studio 5000 software, you can configure the «Output State during Program Mode» to ensure the 32 outputs behave safely during logic updates. Periodically verify the 24V DC field power supply; if the voltage drops below 10V, the 1756-OB32 may behave erratically or report I/O faults in the controller log.
FAQs
Q: Does the 1756-OB32 have individual electronic fusing?
A: No, the 1756-OB32 uses group fusing. For per-point electronic fusing, consider the 1756-OB16E.
Q: Which terminal block should I use with the 1756-OB32?
A: You must use a 36-pin RTB, such as the 1756-TBCH or 1756-TBS6H.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This high-density 32-point output card requires a stable backplane environment, typically powered by a 1756-PA75 power supply.
