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Introducing extreme environment controllers

Rockwell Automation's extreme environment controllers (Bulletin 1756 ControlLogix-XT) share the same features and programming interfaces as standard ControlLogix controllers but are certified to operate in extreme conditions. ControlLogix-XT modules are a darker gray in color than the ControlLogix modules and are spaced in every other slot to provide improved ventilation/isolation. In addition, the ControlLogix-XT modules are treated with a conformal coating, which improves the resistance of the product to corrosive environments.

ControlLogix-XT controllers and modules are rated for temperatures ranging from -20 °C to 70 °C (-4 °F to 158 °F) and have the cULus, Class 1, Div 2, C-Tick, CE, ATEX Zone 2, SIL 2, IEC 61131-2, ANSI-ISA-S71.04-1985, Class G1, G2, and G3, Series 6 (L6) and Series 7 (L7) environmental certifications. The standard controllers and GuardLogix controllers are all available in extreme environment form factors.

At the time of writing, extreme environment controllers are not available for Series 8.

In the next section, we will discuss the ControlLogix operating cycle, how it differs from other PLCs, and the impact it has on the logic you will write.