Data Transmission by Accessing Layer 2 Services S5-95U, SINEC L2
FB224 Explanation
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Segment 1 0000
Name :EMPFANG
Fetch indication
Bez :EMPF I/Q/D/B/T/Z: I BI/BY/W/D: BI
:
Only the indications of layer 2 services are
: fetched in this FB
:
:ON =EMPF
If receive is not enabled or the
:ON F 79.0 STBR bit "Receive viable"
: is not set
:BEC End
:
:JC FB 253
Invoke L2-RECEIVE
Name :L2-REC
A-NR : KY 0,148
Job number for indication = 148
ZTYP : KS DB Data are stored in DB
DBNR : KY 0,34 DB34 in this case
ZANF : KF +10 Data are stored starting at DW 10
ZLAE : KF -1 ”Wildcard length”
: *******
:A F 255.0 Save parameter assignment error
:= F 20.7 byte for subsequent evaluation
: *******
:AN F 255.0 If no parameter assignment error has
:AN F 79.3 occurred and STBR bit "Completed with
:RB =EMPF error" is not set, reset receive enable
:
:BE
In the following sample programs for the various layer 2 services ( sections 8.5 to 8.9), data
are interchanged between two stations on the SINEC L2 LAN. Both stations are S5-95Us and have
the station addresses TLN 1 and TLN 2.
The parameters to be assigned to the layer 2 accesses are listed in section 8.3, Table 8-4. It is
assumed that you have already configured the DB1s.
Once you have completely developed your program for using a layer 2 service, start up your PLC.
Proceed as follows:
Switch the mode selector of the PLC to RUN.
Data transmissions are best checked by means of a programmer. Connect a programmer to
each PLC and have it display the DBs, the status bytes and the parameter assignment error
byte. (The format of the status bytes and parameter assignment error byte are shown in
chapter 5.).
Read also section 3.3 "Starting Up a System".
Appendix E contains the cycle delay times of the PLC in connection with data transmissions.
8-14
EWA 4NEB 812 6112-02
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