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Communication with s7 PLCs helper classes
/*
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*/
package com.sourceforge.snap7.moka7;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Calendar;
/**
*
* @author Dave Nardella
*/
// Step 7 Constants and Conversion helper class
public class S7 {
// S7 ID Area (Area that we want to read/write)
public static final int S7AreaPE = 0x81;
public static final int S7AreaPA = 0x82;
public static final int S7AreaMK = 0x83;
public static final int S7AreaDB = 0x84;
public static final int S7AreaCT = 0x1C;
public static final int S7AreaTM = 0x1D;
// Connection types
public static final byte PG = 0x01;
public static final byte OP = 0x02;
public static final byte S7_BASIC = 0x03;
// Block type
public static final int Block_OB = 0x38;
public static final int Block_DB = 0x41;
public static final int Block_SDB = 0x42;
public static final int Block_FC = 0x43;
public static final int Block_SFC = 0x44;
public static final int Block_FB = 0x45;
public static final int Block_SFB = 0x46;
// Sub Block Type
public static final int SubBlk_OB = 0x08;
public static final int SubBlk_DB = 0x0A;
public static final int SubBlk_SDB = 0x0B;
public static final int SubBlk_FC = 0x0C;
public static final int SubBlk_SFC = 0x0D;
public static final int SubBlk_FB = 0x0E;
public static final int SubBlk_SFB = 0x0F;
// Block languages
public static final int BlockLangAWL = 0x01;
public static final int BlockLangKOP = 0x02;
public static final int BlockLangFUP = 0x03;
public static final int BlockLangSCL = 0x04;
public static final int BlockLangDB = 0x05;
public static final int BlockLangGRAPH = 0x06;
// PLC Status
public static final int S7CpuStatusUnknown = 0x00;
public static final int S7CpuStatusRun = 0x08;
public static final int S7CpuStatusStop = 0x04;
// Type Var
public static final int S7TypeBool = 1;
public static final int S7TypeInt = 1;
// Returns the bit at Pos.Bit
public static boolean GetBitAt(byte[] Buffer, int Pos, int Bit)
{
int Value = Buffer[Pos] & 0x0FF;
byte[] Mask = {
(byte)0x01,(byte)0x02,(byte)0x04,(byte)0x08,
(byte)0x10,(byte)0x20,(byte)0x40,(byte)0x80
};
if (Bit<0) Bit=0;
if (Bit>7) Bit=7;
return (Value & Mask[Bit])!=0;
}
/**
* Returns a 16 bit unsigned value : from 0 to 65535 (2^16-1)
* @param Buffer
* @param Pos start position
* @return
*/
public static int GetWordAt(byte[] Buffer, int Pos)
{
int hi = (Buffer[Pos] & 0x00FF);
int lo = (Buffer[Pos+1] & 0x00FF);
return (hi<<8)+lo;
}
// Returns a 16 bit signed value : from -32768 to 32767
public static int GetShortAt(byte[] Buffer, int Pos)
{
int hi = (Buffer[Pos]);
int lo = (Buffer[Pos+1] & 0x00FF);
return ((hi<<8)+lo);
}
// Returns a 32 bit unsigned value : from 0 to 4294967295 (2^32-1)
public static long GetDWordAt(byte[] Buffer, int Pos)
{
long Result;
Result=(long)(Buffer[Pos] & 0x0FF);
Result<<=8;
Result+=(long)(Buffer[Pos+1] & 0x0FF);
Result<<=8;
Result+=(long)(Buffer[Pos+2] & 0x0FF);
Result<<=8;
Result+=(long)(Buffer[Pos+3] & 0x0FF);
return Result;
}
// Returns a 32 bit signed value : from 0 to 4294967295 (2^32-1)
public static int GetDIntAt(byte[] Buffer, int Pos)
{
int Result;
Result= Buffer[Pos];
Result<<=8;
Result+=(Buffer[Pos+1] & 0x0FF);
Result<<=8;
Result+=(Buffer[Pos+2] & 0x0FF);
Result<<=8;
Result+=(Buffer[Pos+3] & 0x0FF);
return Result;
}
// Returns a 32 bit floating point
public static float GetFloatAt(byte[] Buffer, int Pos)
{
int IntFloat = GetDIntAt(Buffer, Pos);
return Float.intBitsToFloat(IntFloat);
}
// Returns an ASCII string
public static String GetStringAt(byte[] Buffer, int Pos, int MaxLen)
{
byte[] StrBuffer = new byte[MaxLen];
System.arraycopy(Buffer, Pos, StrBuffer, 0, MaxLen);
String S;
try {
S = new String(StrBuffer, "UTF-8"); // the charset is UTF-8
} catch (UnsupportedEncodingException ex) {
S = "";
}
return S;
}
public static String GetPrintableStringAt(byte[] Buffer, int Pos, int MaxLen)
{
byte[] StrBuffer = new byte[MaxLen];
System.arraycopy(Buffer, Pos, StrBuffer, 0, MaxLen);
for (int c = 0; c < MaxLen; c++)
{
if ((StrBuffer[c]<31) || (StrBuffer[c]>126))
StrBuffer[c]=46; // '.'
}
String S;
try {
S = new String(StrBuffer, "UTF-8"); // the charset is UTF-8
} catch (UnsupportedEncodingException ex) {
S = "";
}
return S;
}
public static Date GetDateAt(byte[] Buffer, int Pos)
{
int Year, Month, Day, Hour, Min, Sec;
Calendar S7Date = Calendar.getInstance();
Year = S7.BCDtoByte(Buffer[Pos]);
if (Year<90)
Year+=2000;
else
Year+=1900;
Month=S7.BCDtoByte(Buffer[Pos+1])-1;
Day =S7.BCDtoByte(Buffer[Pos+2]);
Hour =S7.BCDtoByte(Buffer[Pos+3]);
Min =S7.BCDtoByte(Buffer[Pos+4]);
Sec =S7.BCDtoByte(Buffer[Pos+5]);
S7Date.set(Year, Month, Day, Hour, Min, Sec);
return S7Date.getTime();
}
public static void SetBitAt(byte[] Buffer, int Pos, int Bit, boolean Value)
{
byte[] Mask = {
(byte)0x01,(byte)0x02,(byte)0x04,(byte)0x08,
(byte)0x10,(byte)0x20,(byte)0x40,(byte)0x80
};
if (Bit<0) Bit=0;
if (Bit>7) Bit=7;
if (Value)
Buffer[Pos]= (byte) (Buffer[Pos] | Mask[Bit]);
else
Buffer[Pos]= (byte) (Buffer[Pos] & ~Mask[Bit]);
}
public static void SetWordAt(byte[] Buffer, int Pos, int Value)
{
int Word = Value & 0x0FFFF;
Buffer[Pos] = (byte) (Word >> 8);
Buffer[Pos+1] = (byte) (Word & 0x00FF);
}
public static void SetShortAt(byte[] Buffer, int Pos, int Value)
{
Buffer[Pos] = (byte) (Value >> 8);
Buffer[Pos+1] = (byte) (Value & 0x00FF);
}
public static void SetDWordAt(byte[] Buffer, int Pos, long Value)
{
long DWord = Value &0x0FFFFFFFF;
Buffer[Pos+3] = (byte) (DWord &0xFF);
Buffer[Pos+2] = (byte) ((DWord >> 8) &0xFF);
Buffer[Pos+1] = (byte) ((DWord >> 16) &0xFF);
Buffer[Pos] = (byte) ((DWord >> 24) &0xFF);
}
public static void SetDIntAt(byte[] Buffer, int Pos, int Value)
{
Buffer[Pos+3] = (byte) (Value &0xFF);
Buffer[Pos+2] = (byte) ((Value >> 8) &0xFF);
Buffer[Pos+1] = (byte) ((Value >> 16) &0xFF);
Buffer[Pos] = (byte) ((Value >> 24) &0xFF);
}
public static void SetFloatAt(byte[] Buffer, int Pos, float Value)
{
int DInt = Float.floatToIntBits(Value);
SetDIntAt(Buffer, Pos, DInt);
}
public static void SetDateAt(byte[] Buffer, int Pos, Date DateTime)
{
int Year, Month, Day, Hour, Min, Sec, Dow;
Calendar S7Date = Calendar.getInstance();
S7Date.setTime(DateTime);
Year = S7Date.get(Calendar.YEAR);
Month = S7Date.get(Calendar.MONTH)+1;
Day = S7Date.get(Calendar.DAY_OF_MONTH);
Hour = S7Date.get(Calendar.HOUR_OF_DAY);
Min = S7Date.get(Calendar.MINUTE);
Sec = S7Date.get(Calendar.SECOND);
Dow = S7Date.get(Calendar.DAY_OF_WEEK);
if (Year>1999)
Year-=2000;
Buffer[Pos] =ByteToBCD(Year);
Buffer[Pos+1]=ByteToBCD(Month);
Buffer[Pos+2]=ByteToBCD(Day);
Buffer[Pos+3]=ByteToBCD(Hour);
Buffer[Pos+4]=ByteToBCD(Min);
Buffer[Pos+5]=ByteToBCD(Sec);
Buffer[Pos+6]=0;
Buffer[Pos+7]=ByteToBCD(Dow);
}
public static int BCDtoByte(byte B)
{
return ((B >> 4) * 10) + (B & 0x0F);
}
public static byte ByteToBCD(int Value)
{
return (byte) (((Value / 10) << 4) | (Value % 10));
}
}
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