Siemens SINUMERIK 828D Function Manual page 1101

Access method
User interface
User data blocks
Special data blocks
1) Range of the process image variables! The assignment of these variables to the
physical inputs and outputs can be taken from the system overview in the SINUMERIK
828D Commissioning Manual.
These addresses directly serve (i.e. without image memory) the 4 onboard inputs and
2)
the 4 onboard outputs if these are assigned to the PLC.
3) Only the DB numbers are specified in the table for reasons of simplicity. Their
addressing depends on the DB structure and is realized according to the following
scheme:
Figure 14-3
Access Example
Bit DB3801.DBX1000.7
Byte DB3801.DBB0
Word DB4500.DBW2
Double Word DB2500.DBD3004
The access type is part of the address notation and must not be considered to be the same as the data type or
confused with this (see "Data types [Page 1104]").
Note
The permitted offsetfor an address is dependent on the access:
• Bit or byte access: Any offset permitted.
Byte-size variables are placed one beside another seamlessly in a DB.
• Word access: Offset must be divisible by 2.
Word-size variables (2 bytes) are always saved on even offsets.
• Double word access: Offset must be divisible by 4.
Double word-size variables (4 bytes) are always saved on offsets which are divisible by 4.
See also "Data types [Page 1104]".
User interface is an interface comprising data blocks that the firmware creates on the target system. It is used to
exchange data between the PLC on one side and the NCK and HMI on the other side ( → Parameter Manual
SINUMERIK 828D).
This DB neither has to be loaded from the CPU nor into the CPU because it is created by the firmware and
therefore belongs to the system.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Type of memory Min. and max. address numbers
DB
1000 - 7999
DB
9000 - 9063
DB
9900 - 9999
Explanation
Bit 7 of the byte with offset 0 in subrange 1 for axis 2 in user range 38
Byte with offset 0 in subrange 0 for axis 2 in user range 38
Word with offset 2 in subrange 0 in range 0 in user range 45
Double word with offset 4 in subrange 3 in range 0 in user range 25
P4: PLC for SINUMERIK 828D
14.3 Programming
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