Data Transfer with PLC-to-PLC Connections S5-95U, SINEC L2
6.2 Assigning Parameters in DB1 of the S5-95U for Data Exchange with
PLC-to-PLC Connections
There are no default settings in DB1 for the PLC-to-PLC connections. You assign the parameters in
data block DB1 for the following items:
• The station to which the data is to be sent and from which the data is to be received
• The location of the status byte for the function blocks FB L2-SEND and FB L2-RECEIVE for
each connection desired
All status bytes must be in the flag byte area. The status of transmit or receive jobs is displayed in
the status byte, as well as possible errors. The structure and the evaluation of status bytes are
discussed in detail in section 5.4. For function block FB L2-RECEIVE, the flag byte following the
status byte is always reserved for the length byte. The length byte tells how many bytes of data
were received. You have only reading rights to the length bytes.
Figure 6-3 shows how the DBs, STBs, and L2 FBs work together for data transmission in a
programmable controller.
DB1
SL2:
...
STBS 2 MB 10
STBR 2 MB 11
...
L2-SEND
.
A-NR : KY 0,2
.
DBNR : KY 0,21
QANF : KF 0
.
DB21
DW 0
.
.
.
Status byte ‘Send’
flag byte 10
Length byte flag byte 12
Status byte ‘Receive’
flag byte 11
DB22
DW 1
.
.
.
L2-RECEIVE
.
A-NR : KY 0,2
.
DBNR : KY 0,22
ZANF : KF 1
.
Figure 6-3. Diagram: Data Transmission Using PLC-to-PLC Connections
Table 6-1 is a configuration aid for assigning job numbers in DB1.
Create such a table in your planning phase.
How to read the table: Job number A-NR = station address TLN of the communication partner.
Example: PLC 1 transmits with A-NR 2 to PLC 2;
PLC 1 receives with A-NR 2 from PLC 2 etc.
Table 6-1. Configuring Job Number n in DB1
PLC 2
receives from...
PLC 4
receives from...
PLC 3
receives from...
PLC 3
transmits to...
Transmit
Receive
PLC 1
receives from...
PLC 1
transmits to...
PLC 2
transmits to...
PLC 4
transmits to...
ANR 1
ANR 2
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ANR 1
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ANR 1
ANR 4
ANR 2
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ANR 3
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ANR 4
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ANR 2
ANR 3
ANR 2
ANR 4
ANR 3
ANR 4
ANR 3
ANR 2
ANR 4
ANR 2
ANR 4
ANR 3
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6-4
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