Sending Data - Siemens SIMATIC S5-90U System Manual

S5-90U/S5-95U
Example: The S5-95U is to be connected to the SINEC L1 local area network as a slave with slave
number 2.
Table 14-2. Entering Parameters for SINEC L1
DB1
.
.
.
24: KS ='N ; SL1: SLN 2
36: KS ='DB2 DW0 EF DB2
48: KS =' KBE MB2
60: KS =' PGN 1
.
.
.
The following section describes in detail how sending and receiving of data have to executed.
14.4

Sending Data

The prerequisites for sending data are as follows:
• The parameters are set in DB1 for the location of the Send Mailbox and the location of the
Coordination Byte Send (KBS) (see Section 14.3).
• The data to be sent, additional information (length of the send data "net data"), and destination
slave number have been transferred to the Send Mailbox.
Send Mailbox
Figure 14-5 shows which information has to be stored in what part of the Send Mailbox.
Example:
Send Mailbox in the flag area
(beginning with flag byte 0)
Flag byte 0 Length of the "net data"
(0 to 64 bytes)
Flag byte 1 Numb. of the dest. slave
Flag byte 2 1st data byte
Flag byte 65 64th data byte
* Number of the receiver;
EWA 4NEB 812 6115-02b
SF ' The PLC has slave number 2; Send Mailbox in DB2
DW10 ' beginning with data word DW0; Receive Mailbox in
KBS MB0' DB2 beginning with data word DW10; Coordination
; SDP: N' Byte Receive is flag byte FY2; Coordination Byte
Send is flag byte FY0; the programmer bus number
is 1
DW 0
*
DW 1
DW 32
0=Master
1 to 30=Slave
31=Broadcast
Figure 14-5. Structure of the Send Mailbox
Communication via SINEC L1 LAN
Explanation
Example:
Send Mailbox in a data block
(beginning with DW 0)
DL
Length of the "net
data" (1 to 64 bytes)
1st data byte
63th data byte
DR
Number of the
destination stave
*
2nd data byte
64th data byte
14-5