Siemens ET8 Series Provozní pokyny stáhnout pdf (Strana 26)

Additional Information CLV61x Dual Port (PROFINET IO)

Time 7: The PLC confirms receipt of the data with ReceiveCountBack = 3.

The TransmitCount must begin again with 1 when 255 is reached, i.e., 0 must be omitted.

The transportable data volume depends on the output range selected.

Output size minus 5  Output block size

The max. length of a data telegram is 4000 bytes divided into several blocks.

5.1.9 Binary status bits In

The first input byte (see chapter 5.1.2) displays the binary status bits In.

It contains some status bits and one heartbeat bit.

Bit Name Meaning

–

Reserved

Transmit Buffer

Overrun

0: No error

1: The CLV61x Dual Port has received send data from the PLC and the

queue is full.

Reset: With the next successful transmit telegram sent from the PLC.

Receive Buffer

Overrun

0: No error

1: The receive buffer is full and the received data must be discarded.

Reset: With the next modified ReceiveCountBack from the PLC side.

–

Reserved

PLC Error

0: No error

1: The CLV61x Dual Port identified a handling error when sending data in

the PROFINET IO controller (PLC). The fieldbus module does not accept the

transmitted data if this error occurs and requires

resynchronization with the PROFINET IO controller (PLC). The PLC program

must be corrected based on the error.

Possible causes:

- Impermissible length (e.g., length > 4000).

- The subsequent block was not received within 10 seconds.

- TransmitCount was incremented in the wrong sequence.

If "PLC Error" bit is set, no send data are transmitted.

However, the receiver side is further processed.

If "PLC Error" bit is set, TransmitCountBack is set to 0.

The PLC Error bit is cleared

after TransmitCount is reset to 0 by the PLC.

Heartbeat

0/1: Changes every second – shows the presence of the CLV61x Dual Port.

–

Reserved

–

Reserved

"Binary Status Bits" - Assignment in Handshake / No-Handshake mode

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 51 52

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