Chapter 15 Continuous Function Charts (3) The users have to click an object, and press Delete on the keyboard, as the image shown below. 15.2.7 Editing Devices or Symbols If users want to edit a node, they have to double-click the node, type a device name, and click the blank in the program editing area or press Enter on the keyboard. If the users type a symbol in a node, the Add Symbol window will appear after they press Enter on the keyboard. After the users set a symbol and click OK in the Add symbol window, they will finish declaring the symbol, as the image shown below. Please refer to chapter 6 for more information about symbols. 15-17