Up- And Downloading Of Programs - Beckhoff BC3150 Documentation

Programming
Due to the fact that another variable type (INT) follows the first byte, in the BX/BCxx50 it was assigned the
next free even address. In order to achieve the same data structure on both systems, a dummy byte has to
be inserted in the PC project (see example 2).
Example 2: A structure on the BX/BCxx50 and on the PC with the same memory allocation
Variable BX/BCxx50 memory
Byte %..B0
Byte %..B1 (not necessarily required, since the system
(dummy) deals with this itself if the variable does not exist)
INT (1) %..B2
INT (2) %..B4
Data structure
Type PB_Data
STRUCT
wVar_1:WORD;
iValue_1:INT;
iValue_2:INT;
iValue_3:INT;
END_STRUCT
END_TYPE
Creating a variable structure
VAR_Global
strData_Out AT %QB1000:PB_Data; (*PLC Variables *)
bInput_01 AT %IX0.0:BOOL; (* Input from a terminal *)
END_VAR
Small programming example
strData_Out.wVar_1.0:=bInput_01;
Do not use real values in a mixed data structure
A mixed data structure should not contain real values. If this is nevertheless the case, the
high and low words must be swapped in the BX/BCxx50 or in the TwinCAT master project.
Note
It is better to use an array of Real values or to transfer the Real values individually.
Larger fieldbus data blocks
You can transfer larger fieldbus data blocks, in order to have a reserve for your structure.
Disadvantage: These reserves are then transferred with each fieldbus telegram, resulting in
Note
overload of the fieldbus communication.
5.11

Up- and downloading of programs

The Bus Terminal Controller has a memory for the source code. It can be used for storing the program, the
task configuration, and the libraries. Should the memory be insufficient, the source code may be stored
without task configuration and libraries. This takes up significant less memory space!
General settings
The timing of the source code download to the target system can be specified via Edit/Options. Open the
options menu.
64
PC memory (TwinCAT)
%..B0
%..B1
%..B2
%..B4
Version: 2.1.0 BC3150