Allen Bradley 1746-OB32 Digital DC Output Module

Core Functionalities of the Allen-Bradley 1746-OB32

Product Presentation

The 1746-OB32 is a 32 Channel Digital Output Module by Allen-Bradley. It is a high density low current DC output module, compatible to be fitted in any available slot of 1746 Chassis except slot 0. The voltage output it provides is 24V DC. The 1746-OB32 has 32 outputs with 16 points per common and it has a sourcing operational voltage ranging between 5 and 50V DC. The 1746-OB32 module draws 0.19A of backplane current at 5V DC and it provides an output circuit isolation tested at 1500V AC for 1 minute. It has a maximum signal delay time of 0.1ms in ON and 1ms in OFF mode and the maximum circuit current leakage in the OFF state is 1mA. The 1746-OB32 has 0.25A at 0-60 Deg. Celsius nominal current on each output point and the minimum current load of 1mA for every output channel. The module has an average 8A nominal current and a 2A current per common. The maximum voltage loss in the circuit in the ON state is 1.2V at 0.5A and it has a surge of 1.0A for 1ms repeatable every 2s across each output point, a power dissipation of 0.172W per point, and a total module heat dissipation of 6.45W. The 1746-OB32’s operating temperature ranges between 0 and 60 deg. Celsius (32 and 140 deg. Fahrenheit) at 5-95% non-condensing humidity and it can withstand an operating shock and vibration of 30G and 2.5G respectively at 10-200Hz. It has a C-UL and UL Listed Industrial Control Equipment for Class I, Division 2, Groups A, B, C, D Hazardous Locations certification, and is rated at the NEMA standard ICS 2-230 Noise immunity.

 The 1746-OB32 is a Thirty-Two (32) channel Discrete Input module that is manufactured by Allen-Bradley for the SLC 500 controller platform.

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Technical Reference Q&A

Question1.What protection and isolation mechanisms does the Allen-Bradley 1746-OB32 employ?

Answer: This module employs 1500V AC isolation between the output circuitry and the backplane (tested for 1 minute), effectively suppressing transient surges, electrical noise, and inter-channel interference.

Question2. How does the Allen-Bradley 1746-OB32 ensure signal integrity and fast switching performance?

Answer: It features ultra-fast switching speeds, with a turn-on delay of only 0.1 milliseconds and a turn-off delay of only 1 millisecond, ensuring precise control in time-critical automated processes. Furthermore, leakage current in the turn-off state is limited to 1 mA, minimizing the risk of unintended startup.

Question3. How does the Allen-Bradley 1746-OB32 perform under environmental and industrial stress conditions?

Answer: This module operates reliably in temperatures ranging from 0–60°C and non-condensing humidity from 5–95%, and can withstand 30G shock and 2.5G vibration (10–200 Hz), making it suitable for harsh industrial environments.

Question4. How does the Allen-Bradley 1746-OB32 simplify installation and optimize cabling?

Answer: This module includes a removable terminal block (RTB), color-coded identification strips, and compatibility with 1746-N3 and 1492 cabling systems, ensuring orderly cabling, reducing installation errors, and simplifying maintenance.

Question5.In which application scenarios in industrial automation can the Allen-Bradley 1746-OB32 achieve optimal performance?

Answer: This module is ideal for driving indicator lights, buzzers, horns, alarms, solenoid valves, and small motors, especially suitable for systems requiring high channel density, fast switching, and reliable DC drive.

Question6. How does the Allen-Bradley 1746-OB32 differ from other similar digital output modules?

Answer: Its combination of high channel density, low power consumption, fast response time, strong isolation performance, and industry certifications makes it ideal for compact, high-performance control systems.

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