The Allen-Bradley 1756-L75 is a ControlLogix controller. It is part of the Programmable Automation Controller (PAC) family, which features a user memory of 32 MB and an I/O memory of 0.98 MB. It has one (1) integrated USB communication port. It is capable of interfacing 128,000 Discrete I/O and 4000 Analog I/O memory
Allen-Bradley 1756-L73XT ControlLogix-XT 1756-L7 Logix5673 Controller, Conformally Coated for extended protection in harsh & corrosive environments, with 8 Mbytes User Memory, 1-Port USB 2.0, 32 Tasks, 100 Programs/Task, 128,000 Total I/O; Operating Temperature Range from -20…+70 °C (-4…+158 °F); Customers who previously used the LXT chassis should now migrate to the K version of the chassis