13/08/2013 PM 9845 0187 01 Page 2 of 24
11.
Modbus Protocol Implementation ............................................................................................................................... 18
11.1.
Supported Modbus specification ............................................................................................................................ 18
11.2.
Supported Modbus functions ................................................................................................................................. 18
11.3.
Function code - data field ...................................................................................................................................... 18
11.4.
Exception codes .................................................................................................................................................... 19
11.5.
Examples ............................................................................................................................................................... 19
11.5.1.
Illegal Data Address ...................................................................................................................................... 19
11.5.2.
Outlet Pressure and Outlet Pressure Status ................................................................................................. 19
11.5.3.
Change the active pressure band ................................................................................................................. 20
11.5.4.
Start the machine .......................................................................................................................................... 20
12.
Profibus Protocol Implementation .............................................................................................................................. 21
12.1.
Protocol Specification ............................................................................................................................................ 21
12.2.
Master-slave concept ............................................................................................................................................. 21
12.3.
Buffer structure ...................................................................................................................................................... 21
12.2.1.
Header .......................................................................................................................................................... 21
12.2.2.
Data record ................................................................................................................................................... 23
12.2.3.
Node Address ............................................................................................................................................... 23
12.4.
Exception codes .................................................................................................................................................... 23
12.5.
Examples ............................................................................................................................................................... 24
12.4.1.
Illegal Data Address ...................................................................................................................................... 24
12.4.2.
Outlet Pressure and Outlet Pressure Status ................................................................................................. 24
12.4.3.
Change the active pressure band ................................................................................................................. 24
12.4.4.
Start the machine .......................................................................................................................................... 24
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