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The module <FLibSYS> of the subsystem “Specials”

Introduction

Special module FLibSYS provides static library of functions for working with the OpenSCADA system at the level of its system API. These functions can be used in an user programming area of OpenSCADA system for the organization of not ordinary interaction algorithms.

To address the functions of the library you can use static call address "Special.FLibSYS.{Func}()" or dynamic "SYS.Special.FLibSYS["{Func}"].call()", "SYS.Special.FLibSYS.{Func}()". Where {Func} — function identifier in the library.

Below is the description of each function of the library. For each function it was evaluated the execution time. Measurements were made on the system with the following parameters: Athlon 64 3000 + (ALTLinux 4.0 (32bit)) by measuring the total execution time of the function when you call it 1000 times. Sampling was carried out of the five calculations, rounded to integer. Time is in angle brackets and is measured in microseconds.

1. System-wide functions

1.1. Calling the console commands and operating system utilities (sysCall)

Description:Call the console commands of the OS. The function offers great opportunities to the OpenSCADA user by calling any system software, utilities and scripts, as well as getting the access to the huge volume of system data by means of them. For example the command "ls-l" returns the detailed contents of the working directory.
Parameters:

Example:

using Special.FLibSYS;
test=sysCall("ls -l");
messPut("Example",0,"Example: "+test);

1.2. SQL query (dbReqSQL)

Description: Formation of the SQL-query to DB.
Parameters:

1.3. XML node (xmlNode)

Description: Creation of the XML node object.
Parameters:

Example:

using Special.FLibSYS;
//Creating the "get"  object of the XML node.
req = xmlNode("get");
//Creating the "get" object of the XML node with creating attributes.
//sub_DAQ/mod_ModBus/cntr_1/prm_1 — The path in accord of project structure.
req = xmlNode("get").setAttr("path",);

1.4. Request of the management interface (xmlCntrReq)

Description: Request of the management interface to the system via XML. The usual request is written in the form "<get path="/OPat/%2felem"/>". When we indicate the station the request to the external station is made.
Parameters:

Example:

using Special.FLibSYS;
//Geting status "Off/On" of the parameter "1" of the controller "1" of the module "ModBus".
//sub_DAQ/mod_ModBus/cntr_1/prm_1 —  The path in accord of project structure.
req = xmlNode("get").setAttr("path",);
rez = xmlCntrReq(req);
messPut("test",0,"Example: "+req.text());

//Setting status "On" of the parameter "1" of the controller "1" of the module "ModBus".
req = xmlNode("set").setAttr("path",).setText(1);
rez = xmlCntrReq(req);

//Setting status "Off of the parameter "1" of the controller "1" of the module "ModBus".
req = xmlNode("set").setAttr("path",).setText(0);
rez = xmlCntrReq(req);

1.5. Values archive (vArh)

Description: Getting the object of the values archive (VArchObj) by connecting to the archive using its address.
Parameters:

VArchObj object

Functions:

• begin( usec = 0, archivator = "" ) — Getting the start time of the archive through the return of seconds and microseconds usec for the archivator archivator.
• end( usec = 0, archivator = "" ) — Getting the end time of the archive through the return of seconds and microseconds usec for the archivator archivator.
• period( usec = 0, archivator = "" ) — Getting the periodicity of the archive through the return of seconds and microseconds usec for the archivator archivator.
• get( sec, usec, upOrd = false, archivator = "" ) — Getting the value from the archive at the time sec:usec linked to the top upOrd for the archivator archivator. Real time of the value obtained is set in sec:usec.
• set( val, sec, usec ) — Writing of the value val in the archive buffer for the time sec:usec.
• copy( src, begSec, begUSec, endSec, endUSec, archivator = "" ) — Copying of the part of the source archive src or its buffer in the current beginning from begSec:begUSec and ending with endSec:endUSec for the archivator archivator.
• FFT( tm, size, archivator = "", tm_usec = 0 ) — Performs the Fast Fourier Transformation using the FFT algorithm. Returns an array of amplitudes of the frequencies for archive's values window for begin time tm:tm_usec (seconds:microseconds), depth to history size (seconds) and for archivator archivator.

Example:

using Special.FLibSYS;
val = vArh(strPath2Sep(addr)).get(time,uTime,0,archtor);
return val.isEval() ? "Empty" : real2str(val,prec);

1.6. Buffer of the values archive (vArhBuf)

Description: Getting the object of the buffer of the values archive (VArchObj) to perform the intermediate operations on frames of data.
Parameters:

1.7. Input/Output (IO)

Description: Input/Output to: file, string stream.
Parameters:

IO object

Values:

• valType — value types:
  • "uchar", "uint8", "unsigned char";
  • "uint16", "ushort";
  • "uint32", "uint", "ulong";
  • "uint64";
  • "char", "int8", "schar", "signed char", "integer*1";
  • "int16", "short", "integer*2";
  • "int32", "int", "long", "integer*4", "integer";
  • "int64", "integer*8";
  • "float", "float32", "single", "real*4";
  • "double", "float64", "real*8", "real";
• accs — access mode and type:
  • '' — string stream;
  • 'r[+]' — read;
  • 'w[+]' — write from zero;
  • 'a[+]' — append.
• mFmt — machine format:
  • 'n' — native;
  • 'l' — LittleEndian;
  • 'b' — BigEndian.

Properties:

• length — stream length;
• pos (w) — stream read/write position;
• string (w) — string stream full value;
• mFormat (w) — machine data format;
• stringEncode (w) — file/stream substring encoding.

Functions:

• bool open(string name = "", string accs = "", string mFormat = "n", string enc = ""); — Open for new stream by string or file name.
• bool close(); — Close current stream.
• {string|int|real|Array[int|real]} read(string valType = "char", int cnt = -1, string mFormatEnc = "n|NoEnc"); — Read value valType in cnt for machine format or string encodeIn mFormatEnc.
• {int|IO} {write|wr}({string|int|double|Array} vals, string valType = "char", string mFormatEnc = "n|NoEnc", int cnt = 1); — Write value[s] vals for type valType for machine format or string encodeIn mFormatEnc, and scalar values repeat for cnt.

2. Functions for the astronomical time processing

2.1. Time string (tmFStr) <3047>

Description: Converts an absolute time in the string of the required format. Recording of the format corresponds to the POSIX-function strftime.
Parameters:

Example:

using Special.FLibSYS;
test=tmFStr(SYS.time(),);
messPut("Example",0,"tmFStr(): "+test);

2.2. Full Date (tmDate) <973>

Description: Returns the full date in seconds, minutes, hours, etc., based on the absolute time in seconds from the epoch of 1/1/1970.
Parameters:

Example:

using Special.FLibSYS;
curMin=curHour=curDay=curMonth=curYear=0;
tmDate(tmTime(),0,curMin,curHour,curDay,curMonth,curYear);
messPut("test",0,"Current minute: "+curMin);
messPut("test",0,"Current hour: "+curHour);
messPut("test",0,"Current day: "+curDay);
messPut("test",0,"Current month: "+curMonth);
messPut("test",0,"Current Year: "+curYear);

2.3. Absolute time (tmTime) <220>

Description: Returns the absolute time in seconds from the epoch and in microseconds, if usec is installed in a non-negative value.
Parameters:

2.4. Conversion the time from the symbolic representation to the time in seconds from the epoch of 1/1/1970 (tmStrPTime) <2600>

Description: Returns the time in seconds from the epoch of 1/1/1970, based on the string record of time, in accordance with the specified template. For example, template "%Y-%m-%d %H:%M:%S" corresponds the time "2006-08-08 11:21:55". Description of the format of the template can be obtained from the documentation on POSIX-function "strptime".
Parameters:

Example:

using Special.FLibSYS;
curMin=curHour=curDay=curMonth=curYear=0;
tmDate(tmTime(),0,curMin,curHour,curDay,curMonth,curYear);
test = tmStrPTime(""+curYear+"-"+(curMonth+1)+"-"+curDay+" 9:0:0",);
messPut("Example",0,"tmStrPTime(): "+test);

2.5. Planning of the time in the Cron format (tmCron)

Description: Returns the time planned in the format of the Cron standard beginning from the base time of from the current time, if the base is not specified.
Parameters:

3. Functions of the messages processing

3.1. Messages request (messGet)

Description: Request of the system messages.
Parameters:

3.2. Generation of the message (messPut)

Description: Formation of the system message.
Parameters:

Example:

rnd_sq_gr11_lineClr="red";
Special.FLibSYS.messPut("Example",1,"Event: "+rnd_sq_gr12_leniClr);

4. Functions of the strings processing

4.1. Getting the size of the string (strSize) <114>

Descroption: It is used to get the size.
Parameters:

Example:

Special.FLibSYS.messPut("Example",1,"ReturnString: "+strSize("Example"));

4.2. Getting the part of the string (strSubstr) <413>

Description: It is used to det the part of the string.
Parameters:

Example:

using Special.FLibSYS;
test=strSubstr("Example", 0, strSize("Example")-1);
messPut("Example",1,"ReturnString: "+test);

4.3. Insert of the on string to the another (strInsert) <1200>

Description: It is used to insert of the on string to the another.
Parameters:

4.4. Change the part of the string with the another one (strReplace) <531>

Description: It is used to change the part of the string with the another one.
Parameters:

4.5. Parsing the string on separator (strParse) <537>

Description: It is used to parse the string on separator.
Parameters:

Example:

using Special.FLibSYS;
ExapleString="Example:123";
test=strParse(ExapleString,1,":");
messPut("Example",0,"strParse(): "+test);

4.6. Path parsing (strParsePath) <300>

Description: It is used for the parsing the path on the elements.
Parameters:

Example:

using Special.FLibSYS;
test=strParsePath(path,0,"/");
messPut("Example",1,"strParsePath(): "+test);

4.7. Path to the string with the separator (strPath2Sep)

Description: It is used to convert the path to the string with the separator.
Parameters:

Example:

//Converting value "/ses_AGLKS/pg_so" of the attribute "path" into value "ses_AGLKS.pg_so"
using Special.FLibSYS;
test = strPath2Sep(path);
messPut("Example",0,"path: "+path);
messPut("Example",0,"strPath2Sep(): "+test);

4.8. Coding of the string to HTML (strEnc2HTML)

Description: It is used to code the string for using in the HTML source.
Parameters:

4.9. Encode text to bin (strEnc2Bin)

Description: Use for encode text to bin, from format <00 A0 FA DE>.
Parameters:

4.10. Decode text from bin (strDec4Bin)

Description: Use for decode text from bin to format <00 A0 FA DE>.
Parameters:

4.11. Convert real to string (real2str)

Description: It is used to convert real to string.
Parameters:

4.12. Convert integer to string (int2str)

Description: It is used to convert integer to string.
Parameters:

4.13. Convert the string to real (str2real)

Description: It is used to convert string to real.
Parameters:

4.14. Convert the to integer (str2int)

Description: It is used to convert string to integer.
Parameters:

4.15. Cyclic Redundancy Code (CRC)

Description: Unified Cyclic Redundancy Code implement for 8-64 bits width.
Parameters:

5. Functions for the real processing

5.1. Splitting the float to the words (floatSplitWord) <56>

Description: Splitting the float (4 bites) to the words (2 bites).
Parameters:

5.2. Merging the float from words (floatMergeWord) <70>

Description: Merging the float (4 bites) from words (2 bites).
Parameters:

6. User programming API

Some objects of the module provides functions for user's programming.

The object "Functions library" (SYS.Special.FLibMath)

• ElTp {funcID}(ElTp prm1, ...) — call the library function {funcID}. Return result of the called function.

The object "User function" (SYS.Special.FLibMath["funcID"])

• ElTp call(ElTp prm1, ...) — call the function with parameters prm{N}. Return result of the called function.

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