Order now the 1794-OE4XT, the extended temperature version of the classic 4-channel analog output module. Built for extreme environments, this Allen-Bradley FLEX I/O component ensures reliable performance in locations where standard industrial hardware fails due to thermal stress or harsh atmospheric conditions.
What Is the 1794-OE4XT?
The 1794-OE4XT is a ruggedized analog output module designed for the FLEX I/O XT series. It provides four channels of analog current or voltage signals, specifically rated for an expanded operating temperature range (-20°C to +70°C). This makes it ideal for remote pump stations, outdoor control panels, and heavy industrial facilities like steel mills or oil rigs where temperature fluctuations are common.
Key Technical Specifications
- Operating Temperature: -20°C to +70°C (-4°F to +158°F)
- Channels: 4 non-isolated
- Output Signals: 4…20 mA and +/-10V DC
- Digital-to-Analog Resolution: 12-bit
- Relative Humidity: 5…95% non-condensing
- Shock/Vibration: Tested to higher XT standards
- Power Consumption: 70 mA @ 24V DC
Environmental Resilience
The «XT» designation signifies that this module has undergone rigorous testing to withstand broader thermal ranges and more aggressive vibration profiles. It maintains the same footprint and wiring compatibility as the standard 1794-OE4, allowing for a direct upgrade in existing FLEX I/O systems that are experiencing failures due to environmental heat or cold soak.
Maintenance Tips
To ensure the longevity of the 1794-OE4XT in extreme environments, periodically inspect the terminal base connections for oxidation, especially in high-humidity areas. Use a conformal coating if the module is exposed to corrosive gases. Even though it is rated for 70°C, ensure adequate airflow within the enclosure to prevent localized hotspots that exceed the module’s rating.
Frequently Asked Questions
Q: Is the 1794-OE4XT interchangeable with the standard 1794-OE4?
A: Yes, they share the same electronic profile and terminal base compatibility. You can replace a 1794-OE4 with a 1794-OE4XT without changing your PLC program.
Q: What happens if the temperature drops below -20°C?
A: Operating below the rated range may cause the internal components to drift out of calibration or fail to initialize correctly. Always use enclosure heaters in sub-arctic conditions.
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