These plug-in PLC modules are 100% compatible with GE PACSystems RX3i and RX7i controllers and provide such specialty functions as resolver, SSI and LDT interfaces and PLS controllers. Resolver interface modules supply absolute position, tachometer and fault diagnostic data for single and multi-turn applications. LTD interface modules supply absolute position and velocity data to a programmable controller. SSI interface modules offer programmable features such as clock frequency, data type, position preset, count direction and data scaling. Programmable limit switch modules each accept one resolver input for shaft position feedback and control outputs based on the resolver position and other factors.