Data Blocks Siemens 3f1z73
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Data Blocks
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.1
SITRAIN Training for Automation and Industrial Solutions
Objectives Upon completion of this chapter the participant will ...
SIMATIC S7 Siemens AG 2006. All rights reserved.
...
understand the purpose of global data blocks
...
be familiar with elementary and complex data types
...
be able to monitor a data block
...
be familiar with the possibilities for addressing data block variables
Date: File:
2/8/2012 PRO1_10E.2
SITRAIN Training for Automation and Industrial Solutions
Data Blocks (DBs) Accessible to all blocks OB1
Function FC10
Function FC20
Global (shared) data DB20
Instance DB for FB1 Function Block FB1
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.3
Instance data
DB5
SITRAIN Training for Automation and Industrial Solutions
Overview of Data Types in STEP 7
Elementary data types (up to 32 bits)
• Bit data types (BOOL, BYTE, WORD, DWORD, CHAR) • Mathematical data types (INT, DINT, REAL) • Time types (S5TIME, TIME, DATE, TIME_OF_DAY)
• Time type (DATE_AND_TIME) Complex data types (longer than 32 bits)
• Array (ARRAY) • Structure (STRUCT)
• Character chain (STRING)
-defined data types (longer than 32 bits)
SIMATIC S7 Siemens AG 2006. All rights reserved.
UDT data type ( Defined Data Type)
Date: File:
2/8/2012 PRO1_10E.4
SITRAIN Training for Automation and Industrial Solutions
Elementary Data Types in STEP 7 Keyword
Length (in bits)
BOOL
1
BYTE
8
Constants
Variables 1 or 0 I 1.0 B#16#A9
MB70
WORD
16
W#16#12AF MW72
DWORD
32 QD40
DW#16#ADAC1EF5
CHAR
8
'w' DBB4
S5TIME
16
S5T#5s_200ms
MW30 INT
16
DINT
32
123 #Value L#65539 MD80
REAL SIMATIC S7 Siemens AG 2006. All rights reserved.
32
1.2 or 34.5E-12 Date: File:
DBD60
2/8/2012 PRO1_10E.5
SITRAIN Training for Automation and Industrial Solutions
Complex Data Types Keyword
Length (in bits)
Example
DATE_AND_TIME
64
DT#01-08-24-12:14:55:234-1
STRING (character string with max. 254 characters)
8 * (number of ´This is a string´ characters +2) ´SIEMENS´
ARRAY (Group of elements of the same data type)
defined
Measured values: ARRAY[1..20] INT
STRUCT (Group of elements of different data types)
defined
Motor: STRUCT Speed : INT Current : REAL END_STRUCT
UDT
UDT as block
( Defined Data Type =
-
"Template" consisting of
defined
STRUCT Speed
elementary or complex data types SIMATIC S7 Siemens AG 2006. All rights reserved.
UDT as array element
Date: File:
: INT
Current : REAL UDT1 END_STRUCT
2/8/2012 PRO1_10E.6
Drive: ARRAY[1..4]
SITRAIN Training for Automation and Industrial Solutions
Creating a Data Block
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.7
SITRAIN Training for Automation and Industrial Solutions
Entering, Saving, ing and Monitoring a Data Block
Declaration View
Data View
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.8
SITRAIN Training for Automation and Industrial Solutions
Initial Value, Actual Value, Initialization, Retentivity
Load Memory
Work Memory
DB
DB
Initial values + Actual values
DB
(with data types)
Actual values
U with STEP 7 Program
in PG
Initial values
Initialize data block + Actual values
DB is retentive until the next transmission PG U With every U startup (i.e. with every STOP-RUN transition) the DB data are reset to the initial loading state
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.9
x SITRAIN Training for Automation and Industrial Solutions
Addressing Data Elements 8 Bits 7
0
Data Byte 0
DBB 0
Data Byte 1
DBW 0
Data Byte 2
DBD 0
Data Byte 3 DBX 4.1
DBD 2000 DBW 2002 DBB 2003
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.10
SITRAIN Training for Automation and Industrial Solutions
Accessing Data Elements DB 18 "Parts" Addr.
Name
Type
0.0
Act_Quantity
INT
2.0
FL_Aux
BOOL
4.0
Number
INT
6.0
10.0
Weight[1]
Weight[2]
SIMATIC S7 Siemens AG 2006. All rights reserved.
Traditional Access
Fully-qualified Access absolute
symbolic
OPN "Parts" L DBW0
or
L
DB18.DBW0
or
L "Parts".ACT_ Quantity
OPN DB 18 A DBX2.0
or
A
DB18.DBX2.0
or
A "Parts".FL_Aux
REAL
REAL
OPN "Parts" T DBW 4
or
T
DB18.DBW4
or
T "Parts".Number
OPN L
or
L
DB18.DBD10
or
L "Parts".Weight[2]
DB 18 DBD 10
Date: File:
2/8/2012 PRO1_10E.11
SITRAIN Training for Automation and Industrial Solutions
Exercise 1: Replacing Bit Memory Variables with DB Variables
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.12
SITRAIN Training for Automation and Industrial Solutions
Exercise 2: Connecting WinCC flexible Tags to DB Variables
Tags in WinCC flexible
SIMATIC S7 Siemens AG 2006. All rights reserved.
Variables in STEP7
Date: File:
2/8/2012 PRO1_10E.13
SITRAIN Training for Automation and Industrial Solutions
If You Want to Know More
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.14
SITRAIN Training for Automation and Industrial Solutions
Example of an ARRAY Measuring_point 1. Measuring_point, data type Real
2. Measuring_point, data type Real 3. Measuring_point, data type Real • • • 10. Measuring_point, data type Real
Array with the name "Measuring_point" (several elements of the same data type)
Display in the Program Editor (Data Block DB 2):
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.15
SITRAIN Training for Automation and Industrial Solutions
Example of a STRUCTURE Motor_data Speed, data type Integer Structure with the name "Motor_data" (several elements with different data types)
Rated_current, data type Real
Starting_current, data type Real Direction, data type Bool
Display in the Program Editor (Data block DB 1):
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.16
SITRAIN Training for Automation and Industrial Solutions
Defining the Address Priority (Symbolic/Absolute)
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.17
SITRAIN Training for Automation and Industrial Solutions
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.1
SITRAIN Training for Automation and Industrial Solutions
Objectives Upon completion of this chapter the participant will ...
SIMATIC S7 Siemens AG 2006. All rights reserved.
...
understand the purpose of global data blocks
...
be familiar with elementary and complex data types
...
be able to monitor a data block
...
be familiar with the possibilities for addressing data block variables
Date: File:
2/8/2012 PRO1_10E.2
SITRAIN Training for Automation and Industrial Solutions
Data Blocks (DBs) Accessible to all blocks OB1
Function FC10
Function FC20
Global (shared) data DB20
Instance DB for FB1 Function Block FB1
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.3
Instance data
DB5
SITRAIN Training for Automation and Industrial Solutions
Overview of Data Types in STEP 7
Elementary data types (up to 32 bits)
• Bit data types (BOOL, BYTE, WORD, DWORD, CHAR) • Mathematical data types (INT, DINT, REAL) • Time types (S5TIME, TIME, DATE, TIME_OF_DAY)
• Time type (DATE_AND_TIME) Complex data types (longer than 32 bits)
• Array (ARRAY) • Structure (STRUCT)
• Character chain (STRING)
-defined data types (longer than 32 bits)
SIMATIC S7 Siemens AG 2006. All rights reserved.
UDT data type ( Defined Data Type)
Date: File:
2/8/2012 PRO1_10E.4
SITRAIN Training for Automation and Industrial Solutions
Elementary Data Types in STEP 7 Keyword
Length (in bits)
BOOL
1
BYTE
8
Constants
Variables 1 or 0 I 1.0 B#16#A9
MB70
WORD
16
W#16#12AF MW72
DWORD
32 QD40
DW#16#ADAC1EF5
CHAR
8
'w' DBB4
S5TIME
16
S5T#5s_200ms
MW30 INT
16
DINT
32
123 #Value L#65539 MD80
REAL SIMATIC S7 Siemens AG 2006. All rights reserved.
32
1.2 or 34.5E-12 Date: File:
DBD60
2/8/2012 PRO1_10E.5
SITRAIN Training for Automation and Industrial Solutions
Complex Data Types Keyword
Length (in bits)
Example
DATE_AND_TIME
64
DT#01-08-24-12:14:55:234-1
STRING (character string with max. 254 characters)
8 * (number of ´This is a string´ characters +2) ´SIEMENS´
ARRAY (Group of elements of the same data type)
defined
Measured values: ARRAY[1..20] INT
STRUCT (Group of elements of different data types)
defined
Motor: STRUCT Speed : INT Current : REAL END_STRUCT
UDT
UDT as block
( Defined Data Type =
-
"Template" consisting of
defined
STRUCT Speed
elementary or complex data types SIMATIC S7 Siemens AG 2006. All rights reserved.
UDT as array element
Date: File:
: INT
Current : REAL UDT1 END_STRUCT
2/8/2012 PRO1_10E.6
Drive: ARRAY[1..4]
SITRAIN Training for Automation and Industrial Solutions
Creating a Data Block
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.7
SITRAIN Training for Automation and Industrial Solutions
Entering, Saving, ing and Monitoring a Data Block
Declaration View
Data View
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.8
SITRAIN Training for Automation and Industrial Solutions
Initial Value, Actual Value, Initialization, Retentivity
Load Memory
Work Memory
DB
DB
Initial values + Actual values
DB
(with data types)
Actual values
U with STEP 7 Program
in PG
Initial values
Initialize data block + Actual values
DB is retentive until the next transmission PG U With every U startup (i.e. with every STOP-RUN transition) the DB data are reset to the initial loading state
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.9
x SITRAIN Training for Automation and Industrial Solutions
Addressing Data Elements 8 Bits 7
0
Data Byte 0
DBB 0
Data Byte 1
DBW 0
Data Byte 2
DBD 0
Data Byte 3 DBX 4.1
DBD 2000 DBW 2002 DBB 2003
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.10
SITRAIN Training for Automation and Industrial Solutions
Accessing Data Elements DB 18 "Parts" Addr.
Name
Type
0.0
Act_Quantity
INT
2.0
FL_Aux
BOOL
4.0
Number
INT
6.0
10.0
Weight[1]
Weight[2]
SIMATIC S7 Siemens AG 2006. All rights reserved.
Traditional Access
Fully-qualified Access absolute
symbolic
OPN "Parts" L DBW0
or
L
DB18.DBW0
or
L "Parts".ACT_ Quantity
OPN DB 18 A DBX2.0
or
A
DB18.DBX2.0
or
A "Parts".FL_Aux
REAL
REAL
OPN "Parts" T DBW 4
or
T
DB18.DBW4
or
T "Parts".Number
OPN L
or
L
DB18.DBD10
or
L "Parts".Weight[2]
DB 18 DBD 10
Date: File:
2/8/2012 PRO1_10E.11
SITRAIN Training for Automation and Industrial Solutions
Exercise 1: Replacing Bit Memory Variables with DB Variables
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.12
SITRAIN Training for Automation and Industrial Solutions
Exercise 2: Connecting WinCC flexible Tags to DB Variables
Tags in WinCC flexible
SIMATIC S7 Siemens AG 2006. All rights reserved.
Variables in STEP7
Date: File:
2/8/2012 PRO1_10E.13
SITRAIN Training for Automation and Industrial Solutions
If You Want to Know More
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.14
SITRAIN Training for Automation and Industrial Solutions
Example of an ARRAY Measuring_point 1. Measuring_point, data type Real
2. Measuring_point, data type Real 3. Measuring_point, data type Real • • • 10. Measuring_point, data type Real
Array with the name "Measuring_point" (several elements of the same data type)
Display in the Program Editor (Data Block DB 2):
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.15
SITRAIN Training for Automation and Industrial Solutions
Example of a STRUCTURE Motor_data Speed, data type Integer Structure with the name "Motor_data" (several elements with different data types)
Rated_current, data type Real
Starting_current, data type Real Direction, data type Bool
Display in the Program Editor (Data block DB 1):
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.16
SITRAIN Training for Automation and Industrial Solutions
Defining the Address Priority (Symbolic/Absolute)
SIMATIC S7 Siemens AG 2006. All rights reserved.
Date: File:
2/8/2012 PRO1_10E.17
SITRAIN Training for Automation and Industrial Solutions
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