The Allen-Bradley 855T-B10TA1 Control Tower Module is a sound-only module from the Bulletin 855T Control Tower Stack Lights series. The 855T Stack Lights series sound modules are designed to communicate application status updates that alert the operators to critical equipment and system needs on the factory floor. Devices in this series are supplied as either factory-assembled units or they can be ordered separately to meet application demands. The 855T-B10TA1 Module is a dual-tone, 2-circuit sound-only module that can handle up to 15 sets of dual-tone combinations. The 855T-B10TA1 Sound-Only Module is designed to fit perfectly into any industrial application environment. It has a black cap housing that is made of polycarbonate (94V-0) material for safe operation in a harsh industrial environment. 

The Allen-Bradley 855T-B10TA1 Module has a 120 Volts AC full voltage operating rating at 50/60 Hertz (with a 100 to 130 Volts AC operating range) and a maximum current rating of 60 milliamps at 110 Volts AC. It has an average operation lifespan (under static) of 20,000 hours. The 855T-B10TA1 Module has a top-side color-coded nameplate, which shows the clearly printed voltage rating of the device. This color coding also allows for easy identification. It has a 2-circuit configuration and it can be used with any combination of 3 light modules on a stack. The 855T-B10TA1 Module has a preset of up to 15 triangle or continuous tones. The 855T-B10TA1 Module has a built-in potentiometer for field adjustment of volume and tone speed as well as for assigning the upper and lower frequency range. The 855T-B10TA1 Module has an IP 53/NEMA Type 1 ingress protection rating and an operating temperature range of -25 to 70 degrees Celsius. The 855T-B10TA1 Module is built to meet the UL, cUL, and CE standards.