Unlike hard-wired safety relays, the Omron G9SP can be reconfigured to multiple purposes. Because it is a solid-state, software-driven unit, all aspects of its operation can be reconfigured, with direct connection to non-contact switches or safety mats. Three I/O sizes are available: 20/8, 10/16 and 10/4. Covering the full range of typical small-to-mid sized systems, the Omron G9SP also comes with optional expansion units for standard I/O signals (12/8 and 0/32). Function blocks up to 128pcs complete this fully flexible range, so you can always be sure of a needs-match solution.