S5-100U Connecting the S5-100U to SINEC L1
The control program for sending data should be structured as follows:
1. Check bit 7 in the KBS to see if data is currently being sent.
- If the programmable controller is sending data, bit 7 is set. During this phase, the Send
Mailbox can not be modified and no transmission can be started.
2. When bit 7 in the KBS has been reset, you can start the transmission by setting bit 7.
3. When bit 7 has been reset by the operating system after data has been sent, you can evaluate
possible errors.
You achieve the following by setting bit 4 in the KBS (express transmission):
• The sending programmable controller treats this message preferentially (possibly by overwriting
a telegram not yet sent).
• The receiver treats the message as an express transmission.
In case of an error, the operating system sets bit 0 of the KBS. The error message is not valid until
bit 7 has been reset in the KBS.
13.3.2 Receiving Data
The prerequisites for receiving data are as follows:
The parameters for the location of the Receive Mailbox and the Coordination Byte Receive (KBE)
(see section 13.2.2) have been set in DB1. Figure 13-6 shows you which information has to be
stored in what part of the Receive Mailbox.
Figure 13-6. Structure of the Receive Mailbox
DW1
DW3
DW2
Flag Byte 1
Flag Byte 2
Flag Byte 3
DL DR
2nd data byte
Length of "net data" (in
bytes)
Source slave number
*
Data ("net data")
Length of the "net
data"
Source slave
number
*
4th data byte
1st data byte
3rd data byte
Example:
Receive Mailbox in the flag area
(beginning with flag byte 1)
Example:
Receive Mailbox in a data block
(beginning with data word 1)
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* Number of the sender: 0 = Master
1 to 30 = Slave
EWA 4NEB 812 6120-02
13-9
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