Allen-Bradley 1769-OB32T CompactLogix Digital DC Output Module
The Allen-Bradley 1769-OB32T, also cataloged as the 1769-OB32T Digital DC Output Module, operates as a dedicated hardware component for solid-state 24 VDC signal execution within CompactLogix control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OB32T |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.68 kg (1.50 lbs) |
| Dimensions | Standard CompactLogix 1769 Form Factor |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | 250 mA Backplane Current at 5.1 VDC (~4.5 W Power Dissipation) |
| Output Type | 32 Transistor Sourcing Solid-State DC Outputs |
| Operating Voltage Range | 5 to 30 VDC (24 VDC Nominal, 10.2 to 26.4 VDC ON-State) |
| Output Current per Point | 0.5 A Max (2.0 A Peak Rating) |
| Continuous Current per Module | 16 A Max Total (4.0 A Group Limit) |
| Surge Current Limit | 1 A for 10 ms (Repeatable Every 2 s) |
| Circuit Protection | Integrated Electronic Short-Circuit Auto-Reset Protection |
| Power Supply Distance Rating | 8 Modules |
| Replacement Terminal Block | 1769-RTBN18 |
Backplane Bus Communication Velocity & Determinism
The Allen-Bradley 1769-OB32T processes high-density discrete logic output commands across the local 1769 backplane, drawing 250 mA at 5.1 VDC. Internal solid-state driver circuits update all 32 transistor sourcing outputs in real time while maintaining deterministic EtherNet/IP communications with CompactLogix and MicroLogix 1500 controllers. High I/O density scaling allows total module output loads up to 16 A continuous across expansion banks, remaining within specified power supply distance limits of 8 modules without compromising firmware flash compatibility or backplane bus communication velocity.
Frequently Asked Questions
Q: How does the integrated electronic protection manage overcurrent faults on individual channels?
A: The onboard electronic short-circuit protection detects excessive current conditions across the transistor output drivers and trips the faulted channel, automatically resetting once the fault clears and junction temperatures normalize.
Q: What is the maximum allowable distance between this 32-point output module and the system power supply?
A: The 1769-OB32T features a power supply distance rating of 8, requiring installation within 8 module slots of a 1769 expansion power supply to guarantee valid backplane voltage levels.
Field Installation Guidelines
Isolate system backplane power and field-side VDC voltage sources before installing or servicing the module assembly. Latch the housing onto a standard 35 mm DIN rail or panel backplate, verifying that the backplane interconnect slides securely into the adjacent module connector. Terminate field output wiring to the 1769-RTBN18 removable terminal block using 22 to 16 AWG stranded copper wire rated for 90 deg C. Route DC signal conductors separately from high-voltage AC lines and drive cables to prevent inductive noise pickup and preserve channel switching isolation.
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