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S5-95F on SINEC L1
The user program for transmitting data should be structured as follows:
Check bit 7 in the KBS to see if data is currently being transferred
(As long as the PLC is transferring data, bit 7 remains set in the KBS. During this phase, never
attempt to change the contents of the Send Mailbox or start another data transfer).
When bit 7 in the KBS has been reset:
Start the transfer by setting bit 7 in the KBS.
When the operating system has reset bit 7 following completion of the transfer: Check for
errors.
If an error occurs during transfer, the operating system sets bit 0 in the KBS. The error, however,
cannot be evaluated until KBS bit 7 has been reset.
13.2.4 Receiving Non-Failsafe Data
Safety Note
Regardless of the intended frame length, the S5-95F's Receive Mailbox for non-fail-
safe data interchange must
•
either have a length of 66 bytes or
•
be located at the end of the flag area or data block.
Prerequisites for receiving data:
The parameters for the locations of Receive Mailbox and Coordination Byte Receive (KBE) have
been initialized in DB1 (see section 13.2.1). Figure 13-8 shows which information is stored where in
the Receive Mailbox:
Example:
Receive Mailbox in flag area
(starting with flag byte 1)
FY 1
Length of the "net data"
(in bytes)
FY 2
Source slave number
FY 3
Data ("net data")
FY 66
*
Number of the sender; 0
13-8
*
=Master
1 to 30 =Slave
Figure 13-8. Structure of the Receive Mailbox
Example:
Receive Mailbox in data block
(starting with data word 1)
DL
DW 1
Length of the "net
data"
DW 2
1st data byte
DW 3
3rd data byte
DW 33
63rd data byte
S5-95F
DR
Source slave
*
number
2nd data byte
4th data byte
64th data byte
EWA 4NEB 812 6210-02
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