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Siemens B4 - page 1
Automation– and Driv e Technology - SCE Training document for the company -w ide automation solution Totally Integrated Automation (T I A) MODULE B4 Data blocks T I A Training doc ument Page 1 of 18 M odule B4 Last revis ion: 02/2002 Data Blocks ...
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Siemens B4 - page 2
Automation– and Driv e Technology - SCE This docum ent was provided by Siemens A&D SC E (autom ation and drive technology, Siemens A&D Cooperates with Education) f or training purposes . Siem ens does not m ake any ty pe of guarantee regar ding its contents. The pas sing on or duplication of this docum ent, including the use and r eport o ...
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Siemens B4 - page 3
Automation– and Driv e Technology - SCE PA GE: 1. Forward ................................................................................................................. 4 2. Notes for Dat a Blocks .......................................................................................... 6 3. Genera ting Data Blocks ............................ ...
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Siemens B4 - page 4
Automation– and Driv e Technology - SCE 1. FORWA RD The m odule B4 is as signed content wise to A dditional functions of S TEP 7- Progra mming . Basics of STEP 7- Programmin g 2 - 3 da y s A m odules A dditional functions of STEP 7- Programmin g 2- 3 days B Modules IT- Communication wit h SIMATIC S7 1- 2 days E modules Industrial field bus system ...
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Siemens B4 - page 5
Automation– and Driv e Technology - SCE Required har dware and software 1 PC, Operating system W indows 95/98/2000/ME/NT 4.0 with - Minimal: 133MHz and 64MB RAM, approx. 65 MB f ree hard dis k spac e - Optim al: 500MHz and 128MB RAM, approx. 65 MB free hard dis k s pace 2 Software ST EP 7 V 5.x 3 MPI- Interfac e for the PC ( e.g. PC- Adapter) 4 P ...
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Siemens B4 - page 6
Automation– and Driv e Technology - SCE 2. NOTES FOR DATA BLOCKS Data Block s (DBs) can be used by y our program to save data in the CPU. Your hard disk contains up to 8 KBy tes ( 8192 Bytes ) space. There ar e two ty pes of data block s. Global DBs, where all OBs, F Bs and FCs r ead all saved data or can even write in the DB and local instance D ...
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Siemens B4 - page 7
Automation– and Driv e Technology - SCE 3. GENERA TING DA TA BLOCKS Data block s are generated and opened lik e program block s in the tool LAD,S TL,FBD: Program blocks . They serve e.g. for the saving of data and sy stem states. In the following text, the generation of a sim ple exam ple is descr ibed by the use of a global data block : Thereby ...
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Siemens B4 - page 8
Automation– and Driv e Technology - SCE In order to generate this program exam ple, the following steps m ust be f ollowed (Ther eby the program is dispens ed with the creation of the hardware c onfiguration): 1. Call SI MA TI C Ma n a g e r with a double click ( ® SIMATIC Manager) 2. Create a new project ( ® F ile ® New) T I A Training doc um ...
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Siemens B4 - page 9
Automation– and Driv e Technology - SCE 3. In the name path, c reate the projec t with the name T estproject_DB . ( ® ’Tes tproject_DB’ ® OK) 4. Insert a new S7 -Progr am ( ® Insert ® Program ® S7-Program ). T I A Training doc ument Page 9 of 18 Mo dule B4 Last revis ion: 02/2002 Data blo cks Forw ar d Note s Generating data blocks ...
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Siemens B4 - page 10
Automation– and Driv e Technology - SCE 5. Highlight the f older Blocks . ( ® Block s) 6. Insert Data Block ( ® Insert ® S7 Block ® Data Block ). T I A Training doc ument Page 10 of 18 M odule B4 Last revis ion: 02/2002 Data blo cks Forw ar d Note s Generating data blocks ...
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Siemens B4 - page 11
Automation– and Driv e Technology - SCE 7. Enter the num ber DB10 f or the data block and accept with OK ( ® DB10 ® OK). 8. Open the data bloc k DB10 with a double click ( ® DB10). T I A Training doc ument Page 11 of 18 M odule B4 Last revis ion: 02/2002 Data blo cks Forw ar d Note s Generating data blocks ...
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Siemens B4 - page 12
Automation– and Driv e Technology - SCE 9. Ack nowledge the ty pe of data block . ( ® Data Block ® OK ) Note: Data block s with an assigned FB are autom atically display ed by the call of your associated FB. It m ak es no sens e to create this alone. Data bloc ks with assigned us er defined data types (UDT) ar e data block s, whose struct ure w ...
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Siemens B4 - page 13
Automation– and Driv e Technology - SCE 10. The Data Bloc k is gener ated with a sy mbol Name . T he Ty pe , an Initial value as well as a Comment (optional) are enter ed. The addres s is autom atically generated and cannot be altered. The data bloc k can be s aved and downloaded into the PLC . The m ode switch on the PLC mus t be on STO P! ( ® ...
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Siemens B4 - page 14
Automation– and Driv e Technology - SCE Data in a data block mus t be determ ined through data ty pes. The f ollowing standard- data types are defined in the S7 below : Type and description Size in Bits Format-Options Range and number notation (low est to hig hest values) Example BOOL (Bit) 1 Boolean tex t TRUE/FALSE TRUE BYT E (Byte) 8 Hex adeci ...
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Siemens B4 - page 15
Automation– and Driv e Technology - SCE 11. Values should be m odified in a data bloc k. It is not adequate to modif y them in the field Initial valu e . This is only possible, when one switches to the Data View under View ( ® View ® Data View). 12. Now a new value can be entered in the field A ctual value and s aved onto the hard drive with as ...
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Siemens B4 - page 16
Automation– and Driv e Technology - SCE 13. In order to generate the progr am with the acc essible data elem ents, the OB1 mus t be opened through a double click in SI MA TIC Ma n a ge r ( ® SIMATIC Manager ® OB1). 14. Then ac cept the setting with OK ( ® OK ). T I A Training doc ument Page 16 of 18 M odule B4 Last revis ion: 02/2002 Data blo ...
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Siemens B4 - page 17
Automation– and Driv e Technology - SCE There are t hree possibilities to access th e data: 1. Direct address access: One can acc ess one data elem ent in a data block with the following instructions : Exam ple: L DB 20. DBB2 Load data byte 2 from DB20 into ACCU 1 L DB 22. DBW 4 Load data word 4 from DB22 into ACCU 1 A DB 2. DBX5.6 Carry out an A ...
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Siemens B4 - page 18
Automation– and Driv e Technology - SCE 15. W ith LA D, STL, FBD: Progra m blocks , y ou now have an editor that give y ou the possibility to generate your STEP 7-Program . The s chem a for the selec tion of the data elem ent through the button is s hown for the firs t three inputs as s pecified below. If the organization block OB1 is not generat ...
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