====== Modbus ======

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In WebHMI, such syntax of addressing ModBus (RTU/ASCII/TCP) registers is defined:

^Register address	^Description	^Data type^	Read(FC((FC - function code used)))/Write(FC)^
|Cx	|Coils. X — output number (valid range is 0..65535). Examples: C1, C3, C44	|Bit| Read(0x01)/Write(0x05)|
|DIx	|Discrete Inputs. X — input number (valid range 0 ..65535). Examples: DI1, DI3, DI44, DI45000	|Bit |Read(0x02)/—|
|HRx	|Holding Registers. X — register address (valid range 0..65535). Examples: HR1, HR3, HR44, HR65043	|Bit, Byte, Word, Double Word	|Read(0x03)/Write(0x06)|
|MHRx	|Identical to HRx. The difference is that the writing in such registers occurs using the Modbus function No. 16 (Preset Multiple Register).	|Bit, Byte, Word, Double Word	|Read(0x03)/Write(0x16)|
|IRx	|Input Registers. X — register address (valid range 0..65535). Примеры: IR1, IR3, IR44, IR65043	|Bit, Byte, Word, Double Word	|Read(0x04)/—|

  ATTENTION! By default, for double word reading, two queries each by one word will be used. To explicitly set 
  double-word  reading with one query (multiple read), you must enable grouping in the connection properties.