2.1.3 The Block Diagram Model which consists of block, arrow Differencing junction and pickoff point Differencing junction Forward path Input Error CONTROLLER Control PLANT Sign Measured output TRANSDUCER Pickoff point Feedback path Fig. 1. 3 Generalized feedback control system2.1.3 The Block Diagram Model – which consists of block, arrow, Differencing junction and pickoff point. Pickoff point