Siemens PLC SIM "Error when allocating local data"
- Thread starter rocket
- Start date
L D[AR2P#0.0]
Lifetime Supporting Member
Where's the code that calls the FB ?
Create a library, copy all the blocks to the library and then post the archived library. We can then run what you are running.
Create a library, copy all the blocks to the library and then post the archived library. We can then run what you are running.
L D[AR2P#0.0]
Lifetime Supporting Member
The string processing (I_STRNG) in FB300 is generating the requirement for large amounts of local data due the fact that the default compiler setting is to allocate space for strings of length 254 bytes.
As your strings are of length 4, change the compiler setting to 4, recompile and all will be well.
As your strings are of length 4, change the compiler setting to 4, recompile and all will be well.
L D[AR2P#0.0]
Lifetime Supporting Member
An alternative coding that does not require the same amount of local data and works with the default compiler string length is as follows:
Code:
DATA_BLOCK DB_Test FB_DT_String
//
// Block Comment...
//
BEGIN
END_DATA_BLOCK
FUNCTION_BLOCK FB_DT_String
VAR_TEMP
SFC_Error : INT;
CurrentDT : DT;
TempDT AT CurrentDT : ARRAY[1..6] OF BYTE;
END_VAR
VAR
MyTimeInt : STRUCT
Year : INT;
Month : INT;
Day : INT;
Hour : INT;
Minute : INT;
Second : INT;
END_STRUCT;
MyTimeStr : STRUCT
Year : STRING[4];
Month : STRING[4];
Day : STRING[4];
Hour : STRING[4];
Minute : STRING[4];
Second : STRING[4];
END_STRUCT;
aS AT MyTimeStr: ARRAY[0..5] OF STRING[4];
aI AT MyTimeInt:ARRAY[0..5] OF INT;
iI:INT;
END_VAR
// Get Current Date and Time
SFC_Error := READ_CLK(CDT := CurrentDT);
IF SFC_Error = 0 THEN
MyTimeInt.Year := WORD_BCD_TO_INT(TempDT[1]);
MyTimeInt.Month := WORD_BCD_TO_INT(TempDT[2]);
MyTimeInt.Day := WORD_BCD_TO_INT(TempDT[3]);
MyTimeInt.Hour := WORD_BCD_TO_INT(TempDT[4]);
MyTimeInt.Minute := WORD_BCD_TO_INT(TempDT[5]);
MyTimeInt.Second := WORD_BCD_TO_INT(TempDT[6]);
END_IF;
// Convert to strings
FOR iI:=0 TO 5 DO
as[iI]:=I_STRNG(aI[iI]);
END_FOR;
END_FUNCTION_BLOCKL D[AR2P#0.0]
Lifetime Supporting Member
Yes.
Here's the block re-coded without using STRUCTS, the local data requirement is now only 28 bytes.
Here's the block re-coded without using STRUCTS, the local data requirement is now only 28 bytes.
Code:
FUNCTION_BLOCK FB300
VAR_TEMP
CurrentDT : DT;
TempDT AT CurrentDT : ARRAY[1..6] OF BYTE;
END_VAR
VAR
sYear : STRING[4];
sMonth : STRING[4];
sDay : STRING[4];
sHour : STRING[4];
sMinute : STRING[4];
sSecond : STRING[4];
END_VAR
// Get Current DATE AND TIME and convert to string
IF READ_CLK(CDT := CurrentDT) = 0 THEN
sYear := I_STRNG(WORD_BCD_TO_INT(TempDT[1]));
sMonth := I_STRNG(WORD_BCD_TO_INT(TempDT[2]));
sDay := I_STRNG(WORD_BCD_TO_INT(TempDT[3]));
sHour := I_STRNG(WORD_BCD_TO_INT(TempDT[4]));
sMinute := I_STRNG(WORD_BCD_TO_INT(TempDT[5]));
sSecond := I_STRNG(WORD_BCD_TO_INT(TempDT[6]));
END_IF;
END_FUNCTION_BLOCKSimilar Topics
Hello Everybody, Is there a way to connect factory talk ME with siemens plcim. So that i can simulate my simatic step 7 logic and factory talk hmi?
Ok so I know that SIMATIC S7-PLCSIM is out there to act as an emulator if you don't have a physical PLC to write and test programs with... but it...
Hello,
I would like to use PLC-SIM together with some PC-software, for instance VB, and have my PLC-program connected to a PC-based plant model...
I have been using PLCSIM v5.2 with hotfix 1 in conjunction with S7 V5.2 SP1.. it works very nicely. I have not yet been able to make my Protool...
The past week we received a new piece of equipment from Germany which utilizes siemens controls. Typically in our company we use A.B. controls for...