Where can you find descriptions and examples of PID control with FB 41, FB 42 and FB 43, and SFB 41, SFB 42 and SFB 43?
The PID Control control functions CONT_C, CONT_S and PULSEGEN are available in two versions but with identical functions:
- FB 41, FB 42, FB 43
The loadable controller FBs are regular user blocks that run in all CPUs (S7-300, S7-400).
SFB 41, SFB 42, SFB 43
The controller SFBs that are integrated in the operating system are in all S7-300 CPUs of the types 313C and 314C and in the C7 devices.
Descriptions of the above controller functions are available in the following documentation:
Reference manual "System Software for S7-300/400 System and Standard Functions)", Volume 2, Chapter 27 (Entry ID: 1214574);
Manual "S7-300 Automation System CPU 31xC Technological Functions" (Entry ID: 12429336). Examples of the SFBs are available for downloading as a self-extracting file under the "Info" link of the entry.
Manual "SIMATIC Basic Software for S7-300/400 PID Control" (available by calling "STEP 7 - PID Control" in STEP 7 under "Start > SIMATIC > Documentation > ...").
- Online Help of the block concerned.
1 ) The document can also be called as "STEP 7 - System Software for S7-300/400 System and Standard Functions" in STEP 7 under "Start > SIMATIC > Documentation > ...".
The controller blocks themselves are available in the STEP 7 Standard Library (SIMATIC Manager: "File > Open > Libraries > ...") in the "PID Control Blocks" (FBs) folder or "System Function Blocks" (SFBs) folder.