CP341模块做MODBUS主站通信不用硬件狗可以么

CP341模块做MODBUS主站通信不用硬件狗程序应该怎么来写，看见网上有好多人说是可以的，就是不知道怎么来做一个模块下有7个欧姆龙的E5EC仪表怎么来进行通信485的接口

问题补充：
哪位大神有CP341的免狗程序我的邮箱1418357061@qq.com不胜感激

最佳答案

安装CP341驱动包，用ASCLL方式通讯，调用FB8、FB7。
把数据放送缓冲区，往数据缓冲区，根据周期时间上升沿触发。
在接受数据块中，设置计数轮询，触发时间计数到几，就发送那部分数据。
//-------------------------------------------------------------------------------------------------------------------------------------------
FUNCTION FC75 : VOID //数据收发

VAR
    R_CPU_NO:INT;
    R_TYP:CHAR;
    R_NO:INT;
    R_OFFSET:INT;
    R_CF_BYT:INT;
    R_CF_BIT:INT;

    SET_OUT:BOOL;
    N:INT;
END_VAR
BEGIN
FB8.DB75(SF := ''S'' // IN: CHAR
               ,REQ :=DB80.MC_OUT1   // IN: BOOL
               ,R := DB80.MC_OUT1=FALSE  // IN: BOOL
               ,LADDR :=416  // IN: INT
               ,DB_NO :=90  // IN: INT
               ,DBB_NO :=0  // IN: INT
               ,LEN :=8  // IN: INT
               ,R_CPU_NO :=R_CPU_NO  // IN: INT
               ,R_TYP :=R_TYP  // IN: CHAR
               ,R_NO :=R_NO  // IN: INT
               ,R_OFFSET :=R_OFFSET  // IN: INT
               ,R_CF_BYT :=R_CF_BYT  // IN: INT
               ,R_CF_BIT :=R_CF_BIT  // IN: INT
               );
FB7.DB76(EN_R :=DB80.MC_OUT1 OR DB80.MC_OUT1=FALSE // IN: BOOL
                ,R := FALSE // IN: BOOL
                ,LADDR :=416  // IN: INT
                ,DB_NO :=91  // IN: INT
                ,DBB_NO :=DB92.JS  // IN: INT
                );

END_FUNCTION

DATA_BLOCK DB80
  STRUCT
   ZD_TIME:INT;
   MC_OUT1:BOOL;
   MC_OUT2:BOOL;
   MC_PN:BOOL;
   MC_IN:BOOL;
   SENT_OUT: BOOL;
       END_STRUCT
BEGIN
END_DATA_BLOCK
//--------------------------------------------------------------------------------------------------------------------------------------------------------------

FUNCTION FC80 : VOID //轮询计时

VAR
    TIME_BCD1,TIME_BCD2:S5TIME;
    OUT_PUT1,OUT_PUT2:BOOL;
    N:INT;
END_VAR
BEGIN
    TIME_BCD1:= S_ODT (T_NO := T254,S :=DB80.MC_OUT2=FALSE,TV := T#0.2S,Q := DB80.MC_OUT1);
    TIME_BCD2:= S_ODT (T_NO := T255,S :=DB80.MC_OUT1,TV := T#0.1S,Q := DB80.MC_OUT2);

   DB80.MC_PN:=DB80.MC_OUT1 AND NOT DB80.MC_IN;
   DB80.MC_IN:=DB80.MC_OUT1;
IF DB80.MC_PN  THEN
    DB80.ZD_TIME:=DB80.ZD_TIME+1;
END_IF;

IF DB80.ZD_TIME>4 THEN
    DB80.ZD_TIME:=0;
   END_IF;

END_FUNCTION

DATA_BLOCK DB90   //发送
    STRUCT
   SENT:ARRAY[1..8] OF BYTE;
    END_STRUCT
BEGIN
END_DATA_BLOCK

DATA_BLOCK DB91  //接收
    STRUCT
   RCV1:ARRAY[1..30] OF BYTE;
   RCV2:ARRAY[1..30] OF BYTE;
   RCV3:ARRAY[1..30] OF BYTE;
   RCV4:ARRAY[1..30] OF BYTE;
    END_STRUCT
BEGIN

END_DATA_BLOCK

DATA_BLOCK DB92//
    STRUCT
     JS:INT;
    END_STRUCT
BEGIN
END_DATA_BLOCK

FUNCTION FC95 : VOID     //发送区
        IF  DB80.ZD_TIME=1 THEN
            DB90.SENT[1]:=B#16#01;
            DB90.SENT[2]:=B#16#03;
            DB90.SENT[3]:=B#16#05;
            DB90.SENT[4]:=B#16#00;
            DB90.SENT[5]:=B#16#00;
            DB90.SENT[6]:=B#16#04;
            DB90.SENT[7]:=B#16#44;
            DB90.SENT[8]:=B#16#C5;
            DB92.JS:=0;
        ELSIF  DB80.ZD_TIME=2 THEN
            DB90.SENT[1]:=B#16#02;
            DB90.SENT[2]:=B#16#03;

提问者对于答案的评价：
谢谢，我试一下

原创文章，作者：more0621，如若转载，请注明出处：https://www.zhaoplc.com/plc130678.html

CP341模块做MODBUS主站通信不用硬件狗可以么

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