The Cisco 2100 Series Wireless LAN Controller supports Cisco Aironet access points running Lightweight Access Point Protocol (LWAPP) only. This includes any LWAPP-enabled Cisco Aironet 1130, 1230, 1240, 1250, and 1500 Series access points.
PLEASE NOTE: The 2100 series controllers only support software versions 7.0.x The 1140 series APs will work with a WLC 2100 running software version 7.0.116 or newer;