????? ?????? ???????: ????? ???????? ????? Modbus [?????? ??]

????? ?????? ???????: ????? ???????? ????? Modbus [?????? ??]

????? ??????? ?? ????? ?????? ????????? ?? ?? ??? ??? ????? ????????? ??????? Modbus. ????? ???????? Modbus ?? ???? ?????????? ??????? ????????? ?? ???? ??????? ????????? ???? ???? ??????? ???????? ?????? ?????? ???????? ?? ???? ??????? ??????? ?????.

?? ??? 1979? ???? ???? ?????? ??????? ???????? ???? ???????? Modbus ????????? ?? ?????? ???????. ??????? ??????? ???????? Modbus ?? ?????? ?? ??????? ??????? RS485 ?? ???????? ??? ??????? ????? ???????? Modbus ???????.

?????? ?? ???????? ????? ????? ???? ??????? ?????? ?????? ???????? ??????? ??????? (PLC). ??? ??? ???????? ???? ?????? ??????? ?????? ?? ???????? ????????. ???? ?????? ?? ???? ??????? ?????? ????? ?? ??? ???? ???? ????? ??????? ?????? ???? ?????? ??? ?? ??? ?? ?? ???? ????. ???? ???? ?????? ?????? ????? ???????? ????? ?????? ?? ?????? ??? ???????? ??????? ???????? ????????.

????? ??????:

(1) ?????? ??????? ???? ?????????? ??????? ???????? Modbus ?????? ?????? ??? ??? ???? ?????? ??? ????? ???? ??????? ???????.

(2) ???? ????????? Modbus ??? ?????? ?????? ?? ???????? ??????????? ??? RS-232 ? RS-485 ??? ??? ???? ????? ????? ???? ??? ????? ??????? ??? ????? ??????? ???????? ??????? ?????????? ??? ??? ???.

(3) ????? ????? ???? Modbus ???????? ????????? ?????? ?????. ??? ??? ????????? ?????????? ???? ??????? ????????.

??? ?????? ??? ????? ???? ???????? Modbus ??????? ??????? ?? ???? ????????? ????????. ???? Modbus ?????? ??????? ????????? ???? ????? ????? ??? ???? ??? ??????? RTU ?ACSII (????? ?? ??????? ??? ????? ??????? ???????? RS485). ??? ???? ?????? ????? Modbus ????? TCP ????? ???? ??????? ??? ????????. ?????? ??? ???? ????? Modbus ????? ModbusPlus ??????? ????????? Modicon.

?????? ?? ??? ????? ?????/???? ?? ???? ?????? ?????. ?????? ?? ???? ????? ????? ???? ????? ?????? ??? ???? ?????? ?????? ???????? ??? ??? ??????.

????? ????? ?????????? ????? Modbus:

ModbusTCP? ??????? RJ45.

ModbusRTU/ASCII? ????? ?????? ??? ??????? RS232/485/422? ????? ?????? ??????

ModbusPlus? ???? ????? ?????? ????? ??????? ???? ????? ?? ???? ????.

??? ?????? ????? ModbusRTU ? ModbusTCP ?????? ?????????.

?????? ????? ??? ???????

1. RTU ? ASCII

1. ????? ???????? ModbusASCII ??? ?????? ????? ??????? ????? ?? ????? ???????? ModbusRTU ??? ???.

???? ???? ?????? ??? ???????? ?? ???????? ASCII ???? ??????.

??? ???? ??????: ???? ?? ??? ???? ??????? ??? ???? ???????? ?? ???????? ASCII ??? ????? ????? (?????? ?? ???? ?? ????? ?????? ???? ???? ?? ????? ????? ??????? ?????? ???????? ????).

??? ???????? RTU ??? ?? ??? ??????? ?? ????????? ??? ?? ?????? ??? ??? ?????? 3.5 ??? ??? ????? ?????? ???? ????? ??????? ????? ???? ???? ??? ?? ????? ????? ??????.

2. ????? ???????? ASCII ??????? ????? ????? ?????? ??? ??????.

??? ???????? ASCII ???? ???? ???? ASCII ???????? ????? ????? ????? ??????? ???? ?????.

??? ??? ????? ????? ?????. ?????? ????? ??????? ???? ??? ?????? ????? ??? ????????. ??? ???? ??????? ???? ????? ??????? ?????? 0xF9? ????? ???? ASCII ??????? 'F' ?'9'. ????? ?????.

??????? ???????? Modbus ?? ?????? ???????? ??? ???? ???? ????? ?????? ?????? ??????????. ?? ????? ??? ?????????? ???? ????? ??? ????? ????????? ?? ??? ?????? ????? ???? ??? ???????? ????????? ???? ?????? ?? ??????? ?? ??? ??????. ????? ??????? ???????? ASCII.

3. ??????? ?????? ????????

?????? ????? RTU ?????? ?? CRC? ????? ?????? ????? ASCII ?????? ?? LRC. ????? ?????? ?? LRC ???? ?? ????? ?????? ?? CRC. ???? ??? ?????? ?????? ???????? ?? ?????? ?????.

2. ???????? TCP ? RTU

1. ????? ???????: Modbus ?? ???????? ????? ?????? ?????? ?????? ???????. ????? ??????? RTU ?ASCII ???? ?????? ??????????. ?????? RTU ???????? ????????? ??? ???? ???????? ???????? ????? ???? TCP ?????? ?? ???? ?? ???????? ???????? ??? ????? ?????? ????? ????? ????? ?? ?????? ?? ?????? ???????? ???? ???????? ??? ??? ??? TCP. ??????? ????? ??????? RTU ?? ?????? ??????.

?. ??? ????? ??????: ????????? ???? ??????? ??????? ?? ModbusTCP. ??????? ???????? ??? ???????? (??? ????? ?????? ??? RS-232/422/485 ???????? ???????? ???????? ??????????? ??? ??? ???)? ???? ??????? ??????? ?? ModbusRtu ?? ModbusASCII. ???? ????? ?????? ????? ??????? ???? ??????? ??????? ?? ModbusPLUS.

??? ????? Modbus