Programming
BC3150 59Version: 2.1.0
5.5 Allocated flags
4kbyte of allocated flags are available. They can be used to assign different variable types to the same
address, e.g. for converting strings to bytes. Data can also be placed here that can be read or written via
ADS by the controller.
Note
Allocated variables are not remanent data
For the Bus Terminal Controllers of the BX series and the BCxx50 the allocated variables
are not saved as remanent data.
Reading/writing of allocated flags via ADS
The flags may also be read via the controller and ADS. In PROFIBUS, the DPV-1 services are used for this
purpose, in CANopen SDO communication is used.
The AmsNetID can be obtained from the System Manager, or it can be displayed via the Bus Terminal
Controller menu.
The PLC port number is 800.
Index group Meaning Index offset (value range)
0x4020 Flag (only BXxxx0) 0..4096
Example
BX program
VAR
Flag_01AT%MB0:WORD;
END_VAR
TwinCAT PC/CX master program
VAR
fbADRSREAD:ADSREAD;
Flag_M:WORD;
END_VAR
fbADRSREAD(
NETID:='172.16.3.0.2.3',(*AMSNetIdBX*)
PORT:=800,(*800-PLC*)
IDXGRP:=16#4020,(*0x4020hexfalgs*)
IDXOFFS:=0,(*byteoffset*)
LEN:=2,(*Lenghtbyte*)
DESTADDR:=ADR(Merker),
READ:=TRUE,
TMOUT:=t#1s);
IFNOTfbADRSREAD.BUSYTHEN
fbADRSREAD(READ:=FALSE);
END_IF
5.6 Local process image in delivery state
The process image of the Bus Terminal Controller consists of input, output and flag area. In addition, there
are unallocated data without fixed address. They are created without specifying an address. For these
variable types the memory allocation is as follows:
• BCxx50 48kbyte,
• BC9x20 128kbyte,
• BXxx00 256kbyte.
The maximum size of a variable or structure (array) is 16kbyte. For the allocated data 2048 bytes of input
data and 2048 bytes of output data are available. The Bus Terminal Controller has 4kbyte of memory
allocated for the flag area.
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