PLCs (programmable logic controllers) and HMIs (human-machine interface) provide comprehensive control, monitoring, and connectivity for industrial automation systems. PLCs and smart relays manage and monitor various industrial automation functions and operations. PLC and smart relay extension and interface modules improve and expand the capabilities and functions of PLCs and smart relays. PLC accessories and replacement parts replace worn and damaged components and increase controller functionality. HMIs, control, and display panels manage, monitor, and bridge connections in automation systems. HMI enclosures surround and protect screens and other human-machine interfaces from dust, debris, and accidental damage.