Balluff BIS M-370-000-A02, Manual, Page: 184 / 198

PROFINET INTERFACE
177
10
Bit 2 is set by the Slave after it completes resynchronization, and then cleared once the
Master has acknowledged that resynchronization is complete.
Bit 3
is set by the Slave when the total CBx response being returned to the Master is larger
than the space available in the Input Buffer (or that the packet being returned is a fragment,
and that there are more fragments to follow). This bit is cleared for the final fragment of a
fragmented response
– and so the Master can know when all the fragments of a response
have been returned from the Slave.
Bit 7
is set to 1 as soon as the Slave has been successfully initialized at power-up, and
remains at 1, to conform to Balluff’s proprietary Protocol.
Byte 1 : is always 0.
Byte 2 : contains the length of the packet in bytes (CBx response or response fragment) to be
sent back to the Master.
Byte 3 through Byte N-2 are used for the actual CBx response or response fragment to be
sent.
Byte N-1: The final byte of the Input Buffer is the Data Consistency Byte for the Input Buffer.
It is a copy of the Input Buffer Control Byte. The Master should check that these two bytes
are the same, before considering the Input Buffer’s data to be valid.
NOTE
The combined total of the input and output buffers cannot exceed 248 bytes.
For specific exchange data examples, refer to the examples in par. 9.5, Profibus Interface.