Highly flexible and modular production plants with decentralised automation enable the process industry to react to fluctuations in demand. This is the case in water treatment, in the pharmaceutical, fine chemical and food industries and also in energy generation. Decentralised controllers from Festo are perfect for this. Festo developed the PA-Toolkit for programming these controllers to enable simple application engineering in line with the “Module Type Package” (MTP) from Namur and ZVEI.