Siemens ET8 Series Instruções de Operação descarregar pdf (Página 28)

Additional Information CLV61x Dual Port (PROFINET IO)

5.2.1 Byte layout in No-Handshake Mode (NH):

Address

Inputs (Data CLV



PLC)

Output (Data PLC



CLV)

Binary inputs

Binary outputs

ReceiveCount (counter)



ReceiveCountBack (counter)

TransmitCountBack (counter)



TransmitCount (counter)

ReceiveLength Lowbyte

TransmitLength Lowbyte

ReceiveLength Highbyte

TransmitLength Highbyte

ReceiveData, Byte 1

TransmitData, Byte 1

ReceiveData, Byte 2

TransmitData, Byte 2

…

ReceiveData, Byte n - 5

TransmitData, Byte n – 5

The length of the data storage area is up to max. 123 bytes depending on the module selected.

The first 5 bytes are used for administration and have special meaning. The remaining bytes from byte 6

onward are the ASCII data for sending / receiving.

The binary inputs and outputs are identical to the Handshake mode.

5.2.2 Receiving data in No-Handshake Mode

The data format is set as in Handshake mode without the STX/ETX frame.

The CLV61x Dual Port puts the received data in the ReceiveData field and also adds its ReceiveLength.

The ReceiveCount value is also incremented to show that new data has been received.

If the data is too long, the overhanging data is truncated and lost during transmission.

If additional data is received, it is always presented to the PLC directly. It is not checked if the user program

in the PLC has already received the data. As a result, data may be overwritten without warning. However,

the user program can check whether the ReceiveCount value is incremented by more than 1 to determine

that data has been overwritten.

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Siemens ET8 Series Instruções de Operação Página 28