S5-95U, SINEC L2 Data Transmission Using a Standard Connection
4.4 Receiving Data
Prerequisites for receiving data:
You have set the parameters for the location of the receive mailbox (RM) and receive coordination
byte (CBR) in data block DB1 (see section 4.2). Figure 4-6 shows where information is stored when
it is received.
Example: The receive mailbox is in the flag Example: The receive mailbox is in the
area (starting with flag byte 0) data block (starting with data
word DW0)
Figure 4-6. Structure of the Receive Mailbox for a Standard Connection
FY 243
DW 0
DW 1
DW 2
FY 0
FY 1
FY 2
DL DR
2nd data item
“Net data” length
in bytes (1 to 242)
Transmitter’s address*
1st data item
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* 1 to 31 = L2 station address (active stations)
“Net data” length
in bytes (1 to 242)
Transmitter’s
address*
4th data item
1st data item
3rd data item
242nd data item DW 121 242nd item241st item
EWA 4NEB 812 6112-02
4-7
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