Specifications

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B-12
B Buep 19-Expander driver
Structure of the reading cycle:
PCS —— PLC
ENQ →
← ACK
READ DATA →
DB AREA
← ACK
EOT →
← ENQ
ACK →
← DATA THE DB AREA
ACK →
← EOT
Structure of the writing cycle:
PCS —— SPS
ENQ →
← ACK
WRITE DATA →
DB AREA
← ACK
EOT →
← ENQ
ACK →
← ORDER SUCCESSFULLY
PERFORMED
ACK →
← EOT
The packets designated above as „data“ specify the real content of the
communication. These data are written into the receive buffer of the
communication data block of the programmable controller (write cycle)
and are processed by the communication program of the programmable
controller. Information is written into the send buffer in the communication
data block of the programmable controller if the processing of the data
has been completed. This send buffer is read by the reading cycle. The
validity of an order is verified via an order number in the data. The send
and receive buffers use 128 bytes in a data block and are not adjustable
within this data block.