Data Blocks (DBs) can be used by your program to save data in the CPU. Your hard disk contains up to 8 Kbytes(8192Bytes) space. There are two types of data blocks. Global DBs, where all OBs, FBs and FCs read all saved data or can even write in the DB and local instance DBs, which are assigned a particular FB. In the DBs, different data types (e.g.

• Siemens S7 Plc

BOOL or WORD) can be saved in arbitrary order. This structuring of a DB follows through input in a table with the tool LAD, STL, FBD - S7 Block Programming. In the program structure from STEP 7, data blocks are found as follows: Figure 1 Data Blocks Data blocks are generated and opened like program blocks in the tool LAD, STL, FBD: Programblocks. They serve e.g.

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For the saving of data and system states. Figure 2 Addressing Data elements Before create Data Blocks (DBs), we must understand about addressing Data in Simatic Step7. Figure 2 show the addressing data elements in Simatic Step7. There is 3 elementary data type:. Bit data Type (Bool, Byte, Word, DWord, Char). Mathematical data type (Int, Dint, Real).

Time types (s5Time, Time, Date, TimeofDay) In the figure 2, 1 box represent 1 Bit memory. 1 Bool have length 1 Bit, and 1 Byte have length 8 Bit. For more detail you can see in table below Type. I,Q,M,L,D Status of the Counter. In this case, we will not use all parameter in SCu Function. We only use Input counter CU and Counter Value CV for store data in DB1.

Create program like figure below Figure 14 Counter Function Step 6: Simulation Save and close program object window. Run PLCSim with click on PLCSim icon. Figure 15 PLCSim And create input output variable for IB 0 (Input), C 0 (Counter), and DB1.DBW0 (Data Block). Figure 16 PLCSim ON Download program Figure 17 Download Program Run simulation Figure 18 Run Simulation Figure 19 Simulation Store data in DB Set IB 0.0 to 1, and see counter in C 0 count 1 and counter store data into DB1.DBW0. Set IB 0.0 to 0 and repeat set IB 0.0 to 1 again, see the count in counter increase and store to DB1.DBW0.

Step 7: Data View Mode in Data Block Double click on DB1 in Simatic manager, to open DB1 editor Figure 20 Open DB1 In VIEW menu select Data View, Figure 21 Data View Select Monitor mode Figure 22 Monitor mode And check data in DB1 in PLCSim and Program Object Data Block, it must be same. Figure 23 Data Block Monitor Download project file Video Demonstration.

Description Optionally loadable function blocks offer a flexible and low-cost alternative to hardware-based solutions for technological tasks. Software blocks can be employed universally on the hardware platforms SIMATIC S7-300, S7-400, C7, ET 200 S and WinAC. SIMATIC offers software solutions specially designed for control and positioning engineering.These loadable function blocks can be obtained as a software license.

Parameterization of functions is easy and userfriendly with the parameterization masks. These masks can be obtained with the software license or as a separate package.

Siemens S7 Plc

Standard SIMATIC modules such as signaling modules and counter modules are used for linking encoders and actuators in central or distributed configurations. Software-based solutions are ideal for simple positioning and control tasks such as pressure and temperature control. The following software packages are available:. Standard PID Control Pre-configured control structure. Modular PID Control Library of standard function blocks. PID Self-Tuner Online self-tuning for all controllers. Easy Motion Control Position-controlled motion control, synchronism.