Programming
BC5250
55
Version: 2.0.0
END_VAR
VAR_IN_OUT
Counter :INT;
END_VAR
MAIN program
PROGRAM MAIN
VAR
fb_Test:Test;
END_VAR
VAR RETAIN
iCounter1:INT;
END_VAR
fb_Test(Counter:=iCounter1);
5.5
Allocated flags
4 kbyte 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_01 AT %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' , (* AMSNetId BX *)
PORT:=800 , (* 800 - PLC *)
IDXGRP:=16#4020 , (* 0x4020hex falgs *)
IDXOFFS:=0 , (* byte offset *)
LEN:=2 , (* Lenght byte *)
DESTADDR:=ADR(Merker) ,
READ:=TRUE ,
TMOUT:=t#1s );
IF NOT fbADRSREAD.BUSY THEN
fbADRSREAD(READ:=FALSE);
END_IF