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Note These SFB's only exist in a few CPU's. Please consult the manual for your specific CPU to determine whether the SFB's required for integrated control facilities are provided by your CPU. Introduction SFB 41 is employed to control technical processes of automation systems with continuous input and output quantities. Individual functions of the PID-controller can be enabled or disables by means of parameters to adjust the controller to the requirements of the control process. Application The controller can be used as a PID set-point controller, as an independent control unit or in multi-loop control configurations as cascaded, combined or proportional controller. Its operation is based on the PID control algorithm of the sampling controller with analog output signals. This can be extended by a pulse shaper to generate pulse-width modulated output signals that are required for on-off controls or three-mode controls of proportional actuators. Description In addition to the functions for the set-point and the actual value branches, SFB 41 also includes a complete PID-controller with continuous output of control-variables as well as manual adjustment options for the manipulated value. Set-point branch Actual value branch 100 The function PV_NORM can normalize the output of CRP_IN in accordance with the following formula: output of PV_NORM = (output of CRP_IN) * PV_FAC + PV_OFF where PV_FAC is preset to 1 and PV_OFF to 0. Calculation of difference (error) value PID-Algorithm Manual control Control value processing LMN = (output of LMNLIMIT) * LMN_FAC + LMN_OFF were LMN_FAC is preset to 1 and LMN_OFF to 0. Since the manipulated value is also available in peripheral format, floating point value LMN is converted to a peripheral value by means of the CRP_OUT function: 27648 Addition of a disturbance quantity
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