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The Allen-Bradley 1756-IG16 TTL Input Module is designed for seamless integration into the ControlLogix 1756 chassis using either the 1756-TBNH or the 1756-TBSH removable terminal block housings. It features a unique low-true format with a TTL source voltage category of 5 Volts DC, operating within a range of 4.5 to 5.5 Volts DC. It supports a nominal input current of 3.7 milliamps and a backplane power consumption of 0.61 Watts, with a maximum thermal dissipation of 4.8 BTU/hour at 60 degrees Celsius. The module offers precise input delay management, featuring nominal hardware delays for voltage transitions supplemented by user-selectable filter times, ensuring reliable performance in demanding control environments.