Reset a data block

[Ranjith]

Is there a simple way to reset the contents(mixture of Bool,Int,Real etc.) of Step7 data block?
Thanks

 

[L D[AR2P#0.0]]

Have a copy of the DB in question with the bool/int/real values at the reset values you require. When you wish to reset, copy the values from the reset DB to the other DB using SFC20

 

[Ranjith]

Thanks LD
I want to reset the contents to Zero. I am using this DB to recieve interfacing signals from another PLC. What I want to do is to reset the whole DB to Zero when the comms lost.

 

[TurpoUrpo]

There is one SFC you can use to fill DB with zeros.

 

[L D[AR2P#0.0]]

Here's an FC that will do the job:

FUNCTION FC 1 : INT
TITLE =
VERSION : 0.1

VAR_INPUT
  blockDB : BLOCK_DB ; 
END_VAR
VAR_TEMP
  pAny : ANY ; 
  byFill : BYTE ; 
END_VAR
BEGIN
NETWORK
TITLE =
      OPN   #blockDB; 
      L     DBLG; 
      LAR1  P##pAny; 
      T     W [AR1,P#2.0]; 
      L     DBNO; 
      T     W [AR1,P#4.0]; 
      L     P#DBX 0.0; 
      T     D [AR1,P#6.0]; 
      L     W#16#1002; 
      T     W [AR1,P#0.0]; 
      L     0; 
      T     #byFill; 
      CALL SFC21 (
           BVAL                     := #byFill,
           RET_VAL                  := #RET_VAL,
           BLK                      := #pAny);
END_FUNCTION

 

[Ranjith]

Thanks very much gentlemen.

 

[widelto]

Now I understand the reason why Peter Nachtwey started a thread about siemens plc software, with AB a simple Fill instruction would do the job.

 

[PLC]

That ab stuff is awesome. I here they even have a microphone you can plug in and just verbally tell the machine how you want it to run

by the way I would use the fill instruction Siemens has too

 

[TurpoUrpo]

LD just wrapped general use fill to specific use function that is easier to use for ppl not so good at siemens way of thinking.

 

[manmeetvirdi]

Hi widelto
Just want to ask you that have you seen following thread:
"Fed Up With Allen Bradley and Rockwell" !!