The 2500-IADP is an I/O Adapter that enables the use of CTI 2500 Series® I/O modules within legacy Texas Instruments Series 500 I/O bases. This adapter offers a seamless upgrade path, allowing you to modernize your Series 500 system without a complete system replacement. You can immediately replace failed Series 500 I/O modules with reliable CTI 2500 Series® modules. When budget and/or time permits, you can then transition to a full CTI 2500 Series® system without losing your initial investment in the replaced I/O modules.