This manual (order number A5E00447392-01) describes the standard software "PID Control" for the SIMATIC S7-300 and S7-400 programmable controllers. The package contains the function blocks CONT_C, CONT_S and PULSEGEN, a parameter assignment user interface for configuring the controller blocks, and this manual explaining the function blocks. It is written for S7 programmers, closed-loop control programmers, operators and maintenance personnel.
The manual explains how the controller blocks form a purely software controller whose data is stored in instance data blocks, how to call the parameter assignment user interface under Windows 95 via Start > SIMATIC > STEP 7 V3 > PID control parameter assignment, and how the individual blocks work. It covers continuous control with FB 41 "CONT_C", step control with FB 42 "CONT_S" and pulse generation with FB 43 "PULSEGEN", including a PULSEGEN application example, manual/automatic switching, setpoint and process variable handling, manipulated variable limiting and normalization, feedforward control and restart behavior. FB 43 "PULSEGEN" has no parameter assignment user interface and must be set with STEP 7 tools. This manual is written in Chinese.
| Function blocks included | CONT_C, CONT_S, PULSEGEN |
|---|---|
| Continuous control block | FB 41 CONT_C |
| Step control block | FB 42 CONT_S |
| Pulse generation block | FB 43 PULSEGEN |
| LMN_FAC default value | 1 |
| LMN_OFF default value | 0 |
| Parameter assignment user interface operating system | Windows 95 |
| Restart input parameter of CONT_C | COM_RST = TRUE |
The package contains the function blocks CONT_C, CONT_S and PULSEGEN, a parameter assignment user interface for the controller blocks, and the manual describing the blocks.
It is the standard software PID Control for the SIMATIC S7-300 and S7-400 programmable controllers.
No. FB 43 "PULSEGEN" has no parameter assignment user interface; its parameters must be set with the STEP 7 tools.
In manual mode the manipulated variable follows the manually selected value and the integrator is matched internally, so switching to automatic mode does not cause a sudden jump of the manipulated variable.