Lenze EMF2133IB Manual do Utilizador descarregar pdf (Página 45)

Process data transfer 7

EDSMF2133IB EN 5.0

7 Process data transfer

request

response

2133PFB008

Fig. 7−1 PROFIBUS process data transfer

PROFIBUS transmits parameter data and process data between the host (master) and the

controllers connected to the bus (slaves). Depending on their time−critical nature, the data

are transmitted via different communication channels.

ƒ Process data are transmitted via the process data channel.

ƒ Process data serve to control the drive controller.

ƒ The transmission of process data is time−critical.

ƒ Process data are cyclically transferred between the host and the controllers

(continuous exchange of current input and output data).

ƒ The host can directly access the process data. In the PLC, for instance, the data are

directly assigned to the I/O area.

ƒ With the function module a maximum of 10 process data words (16 bits/word) can

be exchanged in each direction.

ƒ Process data are not stored in the controller.

ƒ Process data are, for instance, setpoints, actual values, control words and status

words.

) Note!

Observe the direction of the information flow!

ƒ Process input data (Rx data):

– Process data from controller (slave) to host (master)

ƒ Process output data (Tx data):

– Process data from host (master) to controller (slave)

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 133 134

Sem comentários

Lenze EMF2133IB Manual do Utilizador Página 45