General functioning of the FB_CTRL_... Function blocks 3 General functioning of the FB_CTRL_... Function blocks The general functioning of the function blocks in the Controller Toolbox are described in the following paragraphs. General Notes General Notes In general, the TcControllerToolbox can be used on PC, BX or BC systems. If the toolbox is used on a BC system, the maximum number of POUs has to be adjusted in the PLC control under menu item Project, Options... Discretization The continuous transfer functions of the transfer elements assembled in this library are transformed to discrete values using the trapezoidal rule (Tustin formula). The Tustin formula: Function block inputs eMode:
The operating mode of the majority of blocks can be selected with this input. This makes it possible to select one of the following operating modes: TS4100 10 Version: 1.1 eCTRL MODE PASSIVE _ _ The output or outputs of the block are set to zero, but the internal states are retained. eCTRL MODE ACTIVE _ _ The block is executed in accordance with its description, and appropriate output values are calculated (normal operation). eCTRL MODE RESET _ _ All internal states are reset in this operating mode, and the error bit is cleared.