Connecting the S5-100U to SINEC L1 S5-100U
13.3.1 Sending Data
The prerequisites for sending data are as follows:
• The parameters are set in DB1 for the location of the Send Mailbox (see section 13.2.2).
• The data to be sent, additional information (length of the send data “net data”), and destination
slave number are then transferred to the Send Mailbox.
Figure 13-4 shows which information has to be stored in what part of the Send Mailbox.
Figure 13-4. Structure of the Send Mailbox
DW1
DW2
DW33
Flag byte 66
Flag byte 1
Flag byte 2
Flag byte 3
DL DR
2nd data byte
Length of the “net data”
(0 to 64 bytes)
Numb. of the dest. slave*
Data (“net data”)
maximum of 64 bytes
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* Number of the receiver: 0 = Master
1 to 30 = Slaves
31 = Broadcast
Length of the “net
data”
Number of the
destination slave*
1st data byte
63rd data byte 64th data byte
Example:
Send Mailbox in the flag area
(beginning with flag byte 1)
Example:
Send Mailbox in the data block
(beginning with data word DW1)
Structure of the Coordination Byte Send (KBS)
Figure 13-5 shows the structure of the Coordination Byte Send (KBS).
Figure 13-5. Structure of the Coordination Byte Send (KBS)
7 6 5 4 3 2 1 0
KBS
0: No error
1: Error during last data transfer
0: No express transmission
1: Request a bus interrupt for this
transmission (express transmission)
0: Program is able to process Send
Mailbox (operating system has no
access)
1: Send Mailbox is enabled (program has
no access)
Bit
13-8
EWA 4NEB 812 6120-02
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