Siemens SIMATIC S5 Manual page 162
Interface of the programmable controller
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Data Transmission by Accessing Layer 2 Services
Storing Request and Confirmation at the Sender
DB33
0:
KH = 0000;
1:
KY = 000,000;
2:
KY = 001,000;
3:
KY = 000,048;
4:
KY = 002,255;
5:
KH = AAAA;
6:
KH = BBBB;
7:
KH = CCCC;
8:
KH = DDDD;
9:
KH = 0000;
10:
KY = 001,000;
11:
KY = 001,000;
12:
KY = 000,048;
13:
KY = 002,255;
14:
KH = 0000;
Storing the Indication at the Receiver
DB34
. .
.
8:
KH = 0000;
9:
KH = 0000;
10:
KY = 002,000;
11:
KY = 001,000;
12:
KY = 000,048;
13:
KY = 001,255;
14:
KH = AAAA;
15:
KH = BBBB;
16:
KH = CCCC;
17:
KH = DDDD;
18:
KH = 0000;
8-22
****Request frame****
com_class / user_id
service_code / irrelevant
service_class/destination SAP
rem_add_station / rem_add_segm
Data bytes 1 and 2
Data bytes 3 and 4
Data bytes 5 and 6
Data bytes 7 and 8
****Confirmation frame****
com_class / user_id
service_code / link_status
service_class / destination SAP
rem_add_station / rem_add_segm
****Indication frame****
com_class / irrelevant
service_code / irrelevant
service_class / source SAP
rem_add_station / rem_add_segm
Receive data from sender
.
.
.
S5-95U, SINEC L2
Explanation
Explanation
EWA 4NEB 812 6112-02
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