The Allen-Bradley 1756-L72S is a GuardLogix controller from the ControlLogix 5570 series that integrates both standard and safety control capabilities. It features 4 MB of user memory, 2 MB of safety memory, and 0.98 MB of I/O memory, along with 1 GB of non-volatile memory provided by the included 1784-SD1 card. Designed for high-performance and safety-critical applications, the 1756-L72S supports up to 128,000 discrete and 4,000 analog I/O, includes a single USB communication port for local configuration, and is certified for Safety Integrity Level (SIL) 3 compliance under IEC 61508 and ISO 13849 standards.