Siemens SIMATIC S5-100U System Manual page 341

S5-100U
Table 13-2. Setting Parameters in the Coordination Byte
Meaning
"Flag" data identifier
Flag byte
"Data word" identifier
Data block
Data word
The data identifier is in ASCII code.
Overflow
If data packets longer than 64 bytes are received, the information is not written beyond the end of
the receive mailbox. There is no overflow message. The end of the receive mailbox is flag byte
127 in the flag area or the last present data word (in the data block).
Example:
Setting parameters in the S5-100U as slave 1 in function block 1
Definitions:
• "Receive" coordination byte (KBE)
• "Send" coordination byte (KBS)
• Send mailbox (SF)
• Receive mailbox (EF)
• Flag bytes FY 64 to 77 are used as buffer areas.
EWA 4NEB 812 6120-02b
Connecting the S5-100U to SINEC L1
Parameters Address in System Data Area
("F") 4D
0 to 127
("D") 44
2 to 63
0 to 255
Flag byte
Flag byte
Data block
Data block
EA74
H
EA75
H
EA76
H
EA77
H
EA78
H
EA79
H
FY100
FY101
DB2 from DW0
DB3 from DW0
13-3