Product Summary
The 1794-OW8XT module delivers eight isolated, normally-open relay outputs for the Flex I/O platform. Engineers use this unit to switch high-voltage loads from a control system. Its conformal coating ensures reliable operation in harsh, high-temperature settings. This compact module connects diverse field equipment through industrial networks.
Product Procurement & Buyer Guide
Core Specifications for Selection
Procurement managers must verify the module’s supply voltage range. The 1794-OW8XT operates from 19.2 to 31.2 Volts DC and draws 126 milliamps. The module’s FlexBus consumes only 5V DC from the backplane. Its power dissipation is 5.5 Watts, with a thermal dissipation of 18.8 BTU/hr. These specs ensure proper power budget planning for your control panel.
Switching and Load Capabilities
Application engineers must match the load to the relay’s rating. The 1794-OW8XT handles a relay contact voltage of 250V AC. The minimum contact load is 100 µA at 100 mV DC. It provides an initial contact resistance of just 30 milliohms. These features guarantee reliable switching for various inductive and resistive loads.
Performance and Speed Metrics
This Allen-Bradley module works with a bounce time of 1.2 milliseconds. It achieves a maximum switching frequency of 0.3 Hertz at the rated load. The off-state leakage current is only 1.0 mA through the snubber circuit. These metrics make it ideal for applications needing slow, consistent relay switching actions.
Environmental and Physical Tolerances
The 1794-OW8XT uses a conformal coating to withstand high temperatures. Its compact dimensions are 46 mm high, 94 mm wide, and 53 mm deep. This small footprint saves valuable space in a crowded cabinet. The module uses electromagnetic relays that operate well in elevated ambient temperatures.
Installation and Accessory Requirements
A qualified technician must handle the installation of this module. It requires a zinc-plated yellow-chromate steel DIN rail for proper grounding. The unit works with nine different terminal base units from Allen-Bradley. Always add external fusing to protect the output channels from short circuits.
Expert Technical Evaluation & Performance Review
Signal Integrity and Isolation Analysis
The 1794-OW8XT provides module-based channel isolation. Its continuous isolation voltage rating is 250 Volts. This design prevents ground loops and noise from affecting other system components. Engineers trust this isolation for connecting sensitive PLCs to high-voltage actuators.
Frequency Response and Switching Dynamics
The module’s switching frequency of 0.3 Hz suits slow process control applications. The bounce time of 1.2 ms provides a stable contact closure. This performance ensures reliable signal transmission without chattering. It avoids the high-frequency switching typical of solid-state outputs.
Reliability in Harsh Environments
The conformal coating on this Flex I/O module is a key durability feature. It protects the circuit board from moisture, dust, and corrosive gases. The electromagnetic relays inside handle high-temperature cycles without degradation. This robust design extends the mean time between failures.
Load Handling and Contact Durability
The relay contacts handle a 250V AC voltage and a minimum load of 100 µA. The 30 milliohm contact resistance ensures low power loss during operation. Engineers can use this module for pilot lights, contactors, and small motor starters. The snubber circuit protects the contacts from voltage spikes.
Logistics & Standard Packaging Details
Express delivery shipping is available via FedEx, UPS, and DHL.
