Receiving Data - Siemens SIMATIC S5 Manual

S5-95U, SINEC L2
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
area (starting with flag byte 0)
FY 0 "Net data" length
in bytes (1 to 242)
FY 1 Transmitter's address*
FY 2 1st data item
FY 243 242nd data item
* 1 to 31 = L2 station address (active stations)
Figure 4-6. Structure of the Receive Mailbox for a Standard Connection
EWA 4NEB 812 6112-02
Data Transmission Using a Standard Connection
Example: The receive mailbox is in the
data block (starting with data
word DW0)
DL
DW 0 "Net data" length
in bytes (1 to 242)
DW 1 1st data item
DW 2 3rd data item
DW 121 241st item
DR
Transmitter's
address*
2nd data item
4th data item
242nd item
4-7