189
2. There is a specic relationship between numerical value in register of Acuvim
II meter and the real physical value.
3. Dierent parameters may have dierent data length and data type.
These three points are also suitable for the PROFIBUS-DP protocol in PROFIBUS
module.
Note: the following “communication formats”are suitable for the application
data, but not for the PROFIBUS-DP’s frame characteristic data.
Function codes, such as 01H, 02H and 03H, are inquiry commands. For users to
quickly switch the inquiry contents, we dene 8 channels named 1 to 8 , in order
to update data more quickly.
5.3.12 Format of function code 01H
Function code 01H is used to read relay status in MODBUS-RTU. In PROFIBUS-DP,
the format of function code 01H is dened as follows:
Query:
Table 5-17
Frame Bytes Caption
Byte1 Channels can be chosen from 1 to 8
Byte2 01H
Byte3 starting address high byte
Byte4 starting address low byte
Byte5 quantity of coils high byte
Byte6 quantity of coils low byte
Byte7~32 0
Because 16 words are required for IO data in GSD le, all other bytes after Byte7
are set to 0.
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