Product Overview
The 1794-OB16P provides electronically fused outputs for reliable machine control. Electronic protection eliminates the need for external fuses on each channel. The module recovers automatically after a fault condition clears. You can mix this module with any Flex I/O types in a distributed architecture. It works with Logix controllers like ControlLogix and CompactLogix. Legacy controllers such as PLC-5 and SLC-500 also support this module.
Technical Specifications
The 1794-OB16P delivers protected output performance with precise electrical ratings.
Manufacturer: Rockwell Automation / Allen-Bradley
Part Number: 1794-OB16P
Number of Outputs: 16 sourcing channels with electronic fusing
Nominal Output Voltage: 24 VDC
On-state Voltage Range: 10 to 31.2 VDC
Maximum Output Current: 500 mA per channel
Total Output Current Rating: 8.0 Amps (all channels combined)
Minimum On-state Current: 1.0 mA per channel
Performance Characteristics
On-state Voltage Drop Maximum: 0.5 VDC
Off-state Leakage Current Maximum: 0.5 mA
Surge Current: 2 Amps for 50 ms (repeatable every 2 seconds)
Output Signal Delay (Off-to-On): 0.5 milliseconds
Output Signal Delay (On-to-Off): 1.0 millisecond
Isolation Voltage: 50 Volts continuous (no channel-to-channel isolation)
Electronic Protection: Per-channel overcurrent fusing
Power and Thermal Data
Flexbus Current: 60 mA at 5 VDC
Maximum Power Dissipation: 5.0 Watts at 31.2 VDC
Maximum Thermal Dissipation: 17.0 BTU/hr at 31.2 VDC
External DC Supply Current: 25 to 75 mA (typical)
Environmental and Physical Ratings
Operating Temperature: 0 to 55 °C (32 to 131 °F)
Storage Temperature: -40 to 85 °C (-40 to 185 °F)
Relative Humidity: 5 to 95% non-condensing
Vibration Resistance: 5G at 10 to 500 Hz
Operating Shock: 30G
Non-Operating Shock: 50G
Mounting: DIN rail only
Status Features
Status Indicators: 16 yellow LEDs, one per output channel
Fault Indication: LED shows output status and electronic fuse condition
Compatible Terminal Bases
The 1794-OB16P works with these terminal base units:
1794-TB2
1794-TB3
1794-TB3S
1794-TB3K
1794-TB3SK
Compatible Communication Adapters
The 1794-OB16P supports these Flex I/O adapters:
Installation Guidance
Follow these steps to install the 1794-OB16P correctly and safely.
Mount the Terminal Base: Secure a compatible base like 1794-TB3 onto a DIN rail.
Apply 24VDC Power: Connect external DC supply within 10 to 31.2 VDC range.
Wire Field Loads: Connect solenoids or relay coils to the screw clamp terminals.
Insert the Module: Press the 1794-OB16P firmly into the terminal base until latched.
Attach the Adapter: Connect a communication adapter like 1794-AENT on the left.
Configure the Module: Set up the outputs in your Logix or PLC controller software.
Test Outputs: Use yellow LEDs to verify each channel energizes correctly.
The 1794-OB16P does not require external fuses due to electronic protection. After an overcurrent fault, remove the cause and cycle the output. The module will resume normal operation automatically.
Package Contents
Frequently Asked Questions (FAQ)
1. What makes the 1794-OB16P different from the standard 1794-OB16?
The 1794-OB16P includes electronic fusing on each of its sixteen outputs. The standard 1794-OB16 requires external fuses for overcurrent protection.
2. Does the 1794-OB16P provide channel-to-channel isolation?
No, the 1794-OB16P does not have isolation between individual channels. The isolation voltage rating is 50 Volts continuous from outputs to backplane.
3. Which terminal bases are compatible with the 1794-OB16P?
Compatible bases include 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK. The module mounts on DIN rail only.
4. How does the electronic protection work on the 1794-OB16P?
Each channel on the 1794-OB16P has an electronic fuse that trips during overcurrent. After the fault clears, the output recovers without fuse replacement.
5. What is the maximum current per channel on the 1794-OB16P?
Each channel on the 1794-OB16P supports up to 500 mA continuously. The total combined current across all sixteen channels is 8.0 Amps.
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