PLC-API 5.4.4 FB_CTRL_3POINT_EXT The function block provides an extended 3-point element in the functional diagram. Behaviour of the output: fIn := fSetpointValue - fActualValue; TS4100 45 Version: 1.1 TwinCAT v2.9 from Build 956 BX [} 10] TcControllerToolbox.lbx