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Allen Bradley 1769-OB32T Digital Output Module

Configured for discrete logic signal switching and actuator control within industrial control systems, the Allen Bradley 1769-OB32T (1769-OB32T Digital Output Module) provides direct physical and electrical execution. The hardware processes thirty-two distinct 24 VDC sourcing output channels, driving external field devices while interfacing directly with compatible backplane architectures.

Hardware Specifications

Parameter	Specification
Model	1769-OB32T
Brand	Allen Bradley
Origin	Standard Industrial Manufacturing
Weight	1.50 lbs (0.68 kg)
Dimensions	Standard 1769 Compact I/O Form Factor
Operating Temp	0 to 60 deg C (32 to 140 F)
Power Consumption	220 mA at 5 VDC (Backplane current draw)
Number of Outputs	32-channel sourcing
ON State Voltage Range	10.2 to 26.4 VDC (24 VDC nom)
Output Current per Point	2.0 A max continuous
Output Current per Module	4.0 A max continuous
Wire Size	22 to 16 AWG stranded

I/O Density Scaling and Backplane Communication

Engineers utilize the high-density architecture of the module to maximize control panel spatial efficiency. Furthermore, the unit supports seamless integration across distributed I/O racks by managing high-speed backplane bus communication velocity. System integrators must evaluate the power supply distance rating, which limits the module placement to a maximum of eight modules away from the system power supply. Additionally, firmware flash compatibility ensures that the module synchronizes effectively with connected programmable logic controllers, maintaining deterministic network behavior across execution cycles.

Frequently Asked Questions

Q: Does the 1769-OB32T module support live insertion and removal under power (hot-swapping)?

A: No. Technicians must remove all power from the system backplane and external field wiring terminals before installing or extracting the module to prevent electrical arcing and component degradation.

Q: How does the backplane current draw affect system power budgeting?

A: The module draws 220 mA from the 5 VDC backplane power supply. Engineers must calculate the cumulative current draw of all connected I/O modules to ensure the system power supply does not exceed its rated capacity.

Q: What is the maximum continuous current limitation for the module?

A: While each individual point supports up to 2.0 A continuous output current, the total continuous output current for the entire module is limited to 4.0 A simultaneously.

Field Installation Guidelines

1. Mounting Procedure: Securely fasten the module to a standard DIN rail within an appropriate open-type industrial enclosure. Ensure the DIN rail is grounded properly to minimize electromagnetic interference.
2. Terminal Wiring: Strip stranded copper conductors to the appropriate length for the 22 to 16 AWG wire capacity. Insert the conductors firmly into the 1769-RTBN18 replacement terminal block and torque terminal screws securely.
3. Power Verification: Verify that the external 24 VDC power supply remains within the operational range of 10.2 to 26.4 VDC prior to energizing the field circuits.
4. Thermal Management: Maintain ambient enclosure temperatures between 0 deg C and 60 deg C, allowing sufficient spacing above and below the module for passive convection cooling.

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