 . Modbus-Ethernet 
 


      ,     .          :  Modbus (RTU, ASCII, TCP)      ,    Industrial Ethernet   ,    PROFIBUS DP, HART  CAN/CANopen,        OPC UA  MQTT.





 . Modbus-Ethernet 



  



   , 2026



ISBN 978-5-0071-4445-2

     Ridero


 1.       OSI  

1.1.    

       ()      ,   ,   ,  , ,         .      ,        ,              -.     :            ,       .

       ,           ,       ,     ,                   SCADA  ERP .

.       ()     ,  ,          .                   .

1.2.   OSI      

               (OSI).   ,  ,                      ,          ,           .








     Modbus RTU   RS-485:              Modbus   ,      .    Modbus TCP    TCP/IP,       Ethernet,   ,          (, ,    ).




1.3.   


   /           ,     .

  (bus)

       (),       ().    RS-485  Modbus RTU  Profibus DP.     ;            ,       .

  (star)

         .   Industrial Ethernet.          ,   ,         .

  (ring)

  ,   ;      (, RSTP, MRP, HSR)          ,        .            Ethernet.

   

         :           ,                 .

.                       ,  ,    .




1.4.   


        , ,   .








1.5.    

               (   ISA-95),   :

1.  0      ( )

2.  1     /,   

3.  2   , SCADA/HMI,      

4.  3     (MES),  

5.  4      (ERP)  -

         :   01      (Modbus, Profibus, CAN),   23  Industrial Ethernet    (OPC UA),    34   -  /MQTT-.  ,      ,      :    01         ,      34  ,  ,  -  .

.    ,         01          ,      .      8.

1.6. ,    

 ,         ,      :

       ,      

             ,       

        

         ,    

     ()       ,    -

        ,    

  ,         ,  ,    RS-485  Modbus RTU:  ,           ,       .

                    Modbus     ,         .



 2.  Modbus: RTU, ASCII, TCP    

2.1.  Modbus   

Modbus    Modicon ( Schneider Electric)  1979         ,   .  ,         Modbus   -   :      ,  ,  ,     /   .

       : Modbus RTU  Modbus ASCII     (RS-485, RS-232),  Modbus TCP      Ethernet/IP.                ,         .

2.2.   Modbus








. Modbus ASCII      RTU  TCP        ,     ,        (,    ).        Modbus RTU  Modbus TCP.

2.3.   Modbus RTU

 Modbus RTU     ,    /                3,5   :

1.   (1 )      1  247;  0    

2.   (1 )    ( ,   ..)

3.  ( )    /  

4.   CRC-16 (2 )      

01 03 00 00 00 02 C4 0B

		? ? ??????? ??????? ???????
		? ? ? ? ??? CRC-16 (2 ,   )
		? ? ? ???????????     = 2
		? ? ???????????????????    = 0
		? ?????????????????????????   03 ( holding-)
		????????????????????????????    = 1

        regs (holding registers),    0,     1.                 ,     .

2.4.   Modbus ASCII

   RTU,  ASCII    : ()    CR LF (    ),         ASCII-,   .              RTU,            7-  .

2.5.  Modbus TCP  

Modbus TCP      (   )  TCP-    502,       MBAP (Modbus Application Protocol header)  7 :

1.   (2 )           

2.   (2 )   0  Modbus

3.  (2 )     

4.  , Unit ID (1 )        Modbus TCP/RTU        

  CRC  Modbus TCP           TCP/IP.      :  TCP-   CRC     ,    .

.    Modbus TCP/RTU       Unit ID.              SCADA/ Unit ID                      .

2.6.   Modbus

   Modbus       ,     (/)  :








.            Input Registers  Holding Registers,       (Holding Registers,  03)    ( 04).           ,        .

2.7.    Modbus








       ( ,  ,   )        ( , ,  03  83),      ,      ,            .

2.8.  master/slave (client/server)  

 Modbus RTU/ASCII       (master/slave):           ( ,   ),               .   Modbus TCP        .

       RTU   ,    :         RS-485       .               SCADA,     ,       (,      Modbus TCP    RTU    ),       .

       (broadcast)    0  Modbus RTU/ASCII:          . Broadcast       ,        ,           ,            .




2.9.   


     Modbus    ,       :

      ,           502,      -  

          

    RTU/ASCII 247     

        (report-by-exception)         (       )

.       Modbus     ,    ,     .      Modbus        8,    .

          :         Modbus RTU/TCP,                .



 3.  Modbus: , ,  

3.1.     Modbus RTU

    Modbus RTU       RS-485      :   (baud rate),   ,  (parity)    .     9600  19200 , 8  ,    (None), 1   (   8N1),              .

.                     .        ,              .

3.2.     (timeout)

-                ,        (          ),         .   -        ,    ;               .

    -,    ,     

                   100200   




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