OMRON FINS DEMO

unit PLC.OMRON;

interface

uses
    System.StrUtils, System.SysUtils;

const
    HEAD_CODE = '@';
    DEFAULT_UNIT = 0;
    PC_CODE = 'FA';
    HEAD_BODY = '000000000';
    READ_CMD = '0101';
    WRITE_CMD = '0102';
    DEFAULT_BIT = '00';
    END_CODE = '*' + Chr(13);
    WORD_PER_ASCII = 4;
    BYTE_PER_ASCII = 2;

type
    TFINS = class(TObject)
    public
        { 组装 Bit 读命令 }
        class function BuildReadBitCommand(uno: Integer; area: string; channel: Integer; bit: Integer; num: Integer): string;
        { 组装 Bit 写命令 }
        class function BuildWriteBitCommand(uno: Integer; area: string; channel: Integer; bit: Integer; num: Integer; data: array of Integer): string; overload;
        { 组装 Bit 写命令 }
        class function BuildWriteBitCommand(uno: Integer; area: string; channel: Integer; bit: Integer; num: Integer; hex: string): string; overload;
        { 组装 Word 读命令 }
        class function BuildReadWordCommand(uno: Integer; area: string; channel: Integer; num: Integer): string;
        { 组装 Word 写命令 }
        class function BuildWriteWordCommand(uno: Integer; area: string; channel: Integer; num: Integer; data: array of Integer): string; overload;
        { 组装 Word 写命令 }
        class function BuildWriteWordCommand(uno: Integer; area: string; channel: Integer; num: Integer; hex: string): string; overload;
    end;

////////////////////////////////////////////////////////////////////////////////

    TFCSUtil = class(TObject)
    public
        class function IntArrToHexStr(data: array of Integer): string;
        class function GetFCS(data: string; offset: Integer = 0): string;
        class function CheckFCS(data: string): Boolean;
    end;

implementation

{ 组装 Bit 读命令 }
class function TFINS.BuildReadBitCommand(uno: Integer; area: string; channel: Integer; bit: Integer; num: Integer): string;
var
    cmd: string;
    fcs: string;
begin
    cmd := HEAD_CODE + IntToHex(uno, BYTE_PER_ASCII) + PC_CODE + HEAD_BODY + READ_CMD + area + IntToHex(channel, WORD_PER_ASCII) + IntToHex(bit, BYTE_PER_ASCII) + IntToHex(num, WORD_PER_ASCII);
    fcs := TFCSUtil.GetFCS(cmd);
    Result := cmd + fcs + END_CODE;
end;

{ 组装 Bit 写命令 }
class function TFINS.BuildWriteBitCommand(uno: Integer; area: string; channel: Integer; bit: Integer; num: Integer; data: array of Integer): string;
var
    cmd: string;
    fcs: string;
begin
    cmd := HEAD_CODE + IntToHex(uno, BYTE_PER_ASCII) + PC_CODE + HEAD_BODY + WRITE_CMD + area + IntToHex(channel, WORD_PER_ASCII) + IntToHex(bit, BYTE_PER_ASCII) + IntToHex(num, WORD_PER_ASCII) + TFCSUtil.IntArrToHexStr(data);
    fcs := TFCSUtil.GetFCS(cmd);
    Result := cmd + fcs + END_CODE;
end;

{ 组装 Bit 写命令 }
class function TFINS.BuildWriteBitCommand(uno: Integer; area: string; channel: Integer; bit: Integer; num: Integer; hex: string): string;
var
    cmd: string;
    fcs: string;
begin
    cmd := HEAD_CODE + IntToHex(uno, BYTE_PER_ASCII) + PC_CODE + HEAD_BODY + WRITE_CMD + area + IntToHex(channel, WORD_PER_ASCII) + IntToHex(bit, BYTE_PER_ASCII) + IntToHex(num, WORD_PER_ASCII) + hex;
    fcs := TFCSUtil.GetFCS(cmd);
    Result := cmd + fcs + END_CODE;
end;

{ 组装 Word 读命令 }
class function TFINS.BuildReadWordCommand(uno: Integer; area: string; channel: Integer; num: Integer): string;
var
    cmd: string;
    fcs: string;
begin
    cmd := HEAD_CODE + IntToHex(uno, BYTE_PER_ASCII) + PC_CODE + HEAD_BODY + READ_CMD + area + IntToHex(channel, WORD_PER_ASCII) + DEFAULT_BIT + IntToHex(num, WORD_PER_ASCII);
    fcs := TFCSUtil.GetFCS(cmd);
    Result := cmd + fcs + END_CODE;
end;

{ 组装 Word 写命令 }
class function TFINS.BuildWriteWordCommand(uno: Integer; area: string; channel: Integer; num: Integer; data: array of Integer): string;
var
    cmd: string;
    fcs: string;
begin
    cmd := HEAD_CODE + IntToHex(uno, BYTE_PER_ASCII) + PC_CODE + HEAD_BODY + WRITE_CMD + area + IntToHex(channel, WORD_PER_ASCII) + DEFAULT_BIT + IntToHex(num, WORD_PER_ASCII) + TFCSUtil.IntArrToHexStr(data);
    fcs := TFCSUtil.GetFCS(cmd);
    Result := cmd + fcs + END_CODE;
end;

{ 组装 Word 写命令 }
class function TFINS.BuildWriteWordCommand(uno: Integer; area: string; channel: Integer; num: Integer; hex: string): string;
var
    cmd: string;
    fcs: string;
begin
    cmd := HEAD_CODE + IntToHex(uno, BYTE_PER_ASCII) + PC_CODE + HEAD_BODY + WRITE_CMD + area + IntToHex(channel, WORD_PER_ASCII) + DEFAULT_BIT + IntToHex(num, WORD_PER_ASCII) + hex;
    fcs := TFCSUtil.GetFCS(cmd);
    Result := cmd + fcs + END_CODE;
end;

////////////////////////////////////////////////////////////////////////////////

class function TFCSUtil.IntArrToHexStr(data: array of Integer): string;
var
    i: Integer;
    tmpStr: string;
begin
    tmpStr := '';
    for i := 0 to Length(data) do begin
        tmpStr := tmpStr + IntToHex(data[i], WORD_PER_ASCII);
    end;
    Result := tmpStr;
end;

class function TFCSUtil.GetFCS(data: string; offset: Integer = 0): string;
var
    i: Integer;
    fcs: Integer;
begin
    fcs := 0;
    for i := 1 to (Length(data) + offset) do begin
        fcs := fcs xor ord(data[i]);
    end;
    Result := IntToHex(fcs, BYTE_PER_ASCII);
end;

class function TFCSUtil.CheckFCS(data: string): Boolean;
var
    len: Integer;
    fcs: string;
begin
    len := Length(data);
    if len < 22 then begin
        Result := False;
        Exit;
    end;
    if '@' <> data[1] then begin
        Result := False;
        Exit;
    end;
    if ('*' <> data[len - 1]) or (Chr(13) <> data[len]) then begin
        Result := False;
        Exit;
    end;
    fcs := TFCSUtil.GetFCS(data, -4);
    Result := fcs = data[len - 3] + data[len - 2];
end;

end.

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