1794-OB16 Allen-Bradley FLEX I/O Datasheet & Technical Manual

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Allen-Bradley 1794-OB16 FLEX I/O Output Module The Allen-Bradley 1794-OB16, also cataloged as the 1794-OB16 FLEX I/O Output Module, operates as...

SKU: 1794-OB16

Manufacturer: Allen Bradley
Product No.: 1794-OB16
Product Type: Digital Output Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Allen-Bradley 1794-OB16 FLEX I/O Output Module

The Allen-Bradley 1794-OB16, also cataloged as the 1794-OB16 FLEX I/O Output Module, operates as a dedicated hardware component for discrete current-sourcing execution within Rockwell Automation control network architectures.

Hardware Specifications

Parameter	Specification
Model	1794-OB16
Brand	Allen-Bradley
Origin	USA
Weight	0.15 lbs (200 g)
Dimensions	Industry standard FLEX I/O footprint
Operating Temp	0 to 55 deg C
Power Consumption	55 mA @ 5 VDC / 90 mA @ 24 VDC bus draw
Number of Outputs	16 channels, sourcing configuration
Nominal Voltage	24 VDC
Operating Voltage Range	10 to 31.2 VDC
Output Current Rating	8.0 A per module (16 outputs @ 0.5 A)
Max On-State Current	500 mA per channel
Min On-State Current	1.0 mA per channel
Max On-State Voltage Drop	0.5 VDC
Surge Current Limit	2 A for 50 ms, repeatable every 2 seconds
Max Off-State Leakage	0.5 mA
Isolation Voltage	50 V continuous (channel-to-channel and channel-to-system)
Enclosure Rating	IP20 (open style)
Mounting Options	DIN-rail or panel mount via terminal base unit
Compatible Terminal Bases	1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK

Industrial Control & Drive Integration

The 1794-OB16 leverages specific backplane bus communication velocity properties inherent to the FLEX I/O rail system. When interfaced with communication adapters, it executes synchronous I/O density scaling across Profinet and EtherNet/IP deterministic networks. Module timing constraints demand consistent firmware flash compatibility across both the active I/O adapter and the parent controller to ensure deterministic backplane data packet delivery during cyclic execution.

Frequently Asked Questions

Q: Can the 1794-OB16 module be hot-swapped (Removal and Insertion Under Power) during operation?

A: Yes, the module supports RIUP capabilities when utilized with standard FLEX I/O terminal bases. However, field power to the outputs must be isolated prior to removal to prevent inductive arcing or unintended state disruption on the local backplane bus.

Q: What happens if an individual output channel exceeds the 500 mA threshold?

A: Continuous overcurrent beyond 500 mA per channel will cause thermal overload or trigger internal fault protocols depending on the specific series revision (such as the 1794-OB16P derating curve limits), potentially dropping the module output group into an off-state to prevent physical hardware failure.

Field Installation Guidelines

Terminal Base Attachment: Securely latch the module onto the compatible terminal base unit (e.g., 1794-TB3 or 1794-TB3S) prior to applying backplane power. Ensure the mechanical keyswitch on the base matches the correct module profile position.
Wiring Configurations: Connect the external 24 VDC nominal field power supply directly to the specified common and VDC terminals on the base unit. Verify sourcing output leads are routed separately from high-voltage AC cables to minimize electromagnetic interference.
Grounding Requirements: Ensure the DIN-rail or mounting panel is connected to a low-impedance functional earth grounding point. Proper shielding of the field wiring must be maintained to prevent transient noise from corrupting backplane communication.

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