PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-OB16P is a 24V DC sourcing digital output module for the FLEX I/O distributed system. It provides sixteen electronically fused output channels designed to energize discrete field loads. Supported loads include indicator lights, solenoid valves, and relay coils. Each channel delivers up to 500 mA of current. The entire module handles a maximum total load current of 8.0 A across all channels. Internal logic circuits operate via the backplane, drawing 60 mA at 5V DC from the FlexBus.
This output module requires a separate FLEX I/O terminal base for DIN rail mounting and field wiring. Compatible terminal base units include models such as the 1794-TB2, 1794-TB3, and 1794-TB3S. Distributed architectures connect the module to ControlLogix, CompactLogix, PLC-5, or SLC 500 controllers through FLEX I/O network adapters. Supported network communication options include EtherNet/IP, ControlNet, DeviceNet, and PROFIBUS. Sixteen yellow status indicators on the front panel display individual channel states during machine operation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Product Line | Flex I/O 1794 |
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| UPC | 612598179961 |
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| Weight | 0.56 lbs (0.26 kg) |
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| Flexbus Current | 60 mA @ 5V DC |
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| Power Dissipation | 5.0 W @ 31.2V DC |
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| Thermal Dissipation | 17.0 BTU/hr @ 31.2V DC |
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| Product Description | Flex IO 24VDC Output Module |
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| Number of Inputs | 16, sourcing; electronically fused |
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| Terminal base | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD |
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| ON state Voltage, min | 10VDC |
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| ON state Voltage, max. | 31.2VDC |
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| ON state Voltage, nom | 24VDC |
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| Indicators | 16 Yellow status indicators |
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| Mounting | DIN Rail |
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| Wire Size | Determined by installed terminal base |
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| Operating Temperature | 0 to 55 C (32 to 131 F) |
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| Storage Temperature | -40 to 85 C (-40 to 185 F) |
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| Vibration | 5g @ 10 to 500 Hz |
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| Operating Shock | 30 g |
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| Outputs | 16 Sourcing Current |
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| Output Current Rating | 8.0A |
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| On-state Current max. | 500mA per Channel |
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| On-state Voltage Drop max. | 0.5V DC |
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| Off-state Leakage Current max. | 0.5mA |
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| Isolation Voltage | 50V Continuous |
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TECHNICAL INFORMATION
Features
- Sixteen discrete sourcing output channels operating at a nominal 24V DC.
- Integrated electronic fusing protects individual outputs against overcurrent conditions.
- Maximum continuous current rating of 500 mA per channel and 8.0 A total per module.
- Surge current tolerance of up to 1.5 A or 2.0 A for 50 milliseconds.
- Sixteen yellow LED indicators provide individual channel status visibility.
- Backplane communication requires 60 mA of Flexbus current at 5V DC.
- Direct installation into compatible modular FLEX I/O terminal bases on a DIN rail.
TECHNICAL INFORMATION
Applications
- Actuation of industrial 24V DC pilot lights, indicators, and signaling devices.
- Energizing pneumatic and hydraulic solenoid valves in automated machinery.
- Driving interposing relay coils within distributed process control cabinets.
- Distributed discrete I/O for ControlLogix, CompactLogix, and legacy PLC systems.
TECHNICAL INFORMATION
Connections / Interfaces
- Requires a FLEX I/O terminal base unit such as 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, or 1794-TB3SK.
- Terminal base provides screw clamp or spring clamp connections depending on the base selected.
- External DC supply connections require 10 to 31.2V DC with 5% maximum AC ripple.
- Backplane Flexbus connection mates directly with adjacent FLEX I/O terminal bases.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the module onto a compatible FLEX I/O terminal base installed on a standard DIN rail.
- Ensure all power supplies are disconnected before inserting or removing the module from the base.
- Verify that the external 24V DC supply wiring complies with terminal base pinout diagrams.
- Maintain ambient operating temperatures between 0 and 55 degrees Celsius inside the enclosure.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure module parameters in the controller programming software using the corresponding FLEX I/O communication adapter.
- Map sixteen discrete output bits in the controller output image table for channel control.
- Ensure total module current demand does not exceed the 8.0 A rating under full load.
TECHNICAL INFORMATION
Compatibility
- Compatible with FLEX I/O terminal bases 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBN, and 1794-TBNK.
- Connects to EtherNet/IP, ControlNet, DeviceNet, and PROFIBUS FLEX I/O communication adapters.
- Operates in distributed architectures with ControlLogix, CompactLogix, PLC-5, and SLC 500 systems.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with FLEX I/O terminal bases 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBN, and 1794-TBNK. Connects to EtherNet/IP, ControlNet, DeviceNet, and PROFIBUS FLEX I/O communication adapters. Operates in distributed architectures with ControlLogix, CompactLogix, PLC-5, and SLC 500 systems.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the primary function of the Allen-Bradley 1794-OB16P?
The 1794-OB16P is a 16-channel, 24V DC sourcing digital output module for distributed FLEX I/O systems.
Does the 1794-OB16P include circuit protection on its outputs?
Yes, all sixteen sourcing output channels feature built-in electronic fusing to protect against overcurrent faults.
Which terminal bases are compatible with the 1794-OB16P?
Compatible terminal bases include 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBN, and 1794-TBNK.
What is the typical market reference price for the 1794-OB16P?
Observed market reference pricing is around $64.00 USD for used equipment. This figure represents indicative market reference pricing only and is not a final quotation.
