S800 I/O is a comprehensive, distributed, and modular process I/O system that communicates with parent controllers over industry-standard field buses. Module Termination Units (MTUs) host S800 I/O modules and are keyed to ensure the correct module is used. Many Module Termination Units (MTUs) options are available for various S800 I/O modules to meet your project requirements. To download a PDF OUTLINE of all modules in this section, or to COMPARE several items, use the options in the upper‑right corner of the page.