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When entered using a Profibus configuration tool, the above example would typically be
displayed as:
00,00,00,01,0F,01,0D,01,10,00,FF
Some configuration tools will alway display the number of bytes declared in the supplied GSD,
in this case 63. So the above example will appear as:
00,00,00,01,0F,01,0D,01,10,00,FF,00,00,00,00,00,00,00.....
'HPDQG#'DWD#3URWRFRO
Demand Data is a sub-protocol using the first 8 bytes (octets) in both the request and response
message of the cyclic Data Exchange. It allows random read/write access to any parameter within
the Drive. It is enabled by the Profibus-DP- Master setting the first byte of the Cfg_Data to 0x73.
(See Chapter 6, Configuration.)
The sub-protocol consists of 3 parts:
•
• •
• Command
•
• •
• Parameter Reference (Tag Number)
• Parameter Value or Error Code
Byte
01 234567
Reserved
Cmd / Tag
Value
0
111215
Bit
Command
Parameter Tag Number
Reserved
10
&RPPDQG
The Command field in the request message selects the required operation. This is either None,
Read or Write.
The Command field in the response message either confirms that no operation has been
requested, indicates that a Read or Write request has been completed successfully or indicates
that a Read or Write request has failed.
Valid values for the Command field are:
&RPPDQG 5HTXHVW#+0DVWHU#WR#6ODYH, 5HVSRQVH#+6ODYH#WR#0DVWHU,
3 1R#&RPPDQG $FNQRZOHGJH#1R#&RPPDQG
4 5HDG#5HTXHVW $FNQRZOHGJH#7UDQVIHU
5 :ULWH#5HTXHVW 00
:00 5HMHFW#5HTXHVW