S5-100U Connecting the S5-100U to SINEC L1
Table 13-2. Setting Parameters in the Coordination Byte
Meaning Parameters Address in System Data Area
“Flag” data identifier (“F”) 4D EA74
H
Flag byte 0 to 127 EA75
H
EA76
H
“Data word” identifier (“D”) 44 EA77
H
Data block 2 to 63 EA78
H
Data word 0 to 255 EA79
H
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) Flag byte FY100
• “Send” coordination byte (KBS) Flag byte FY101
• Send mailbox (SF) Data block DB2 from DW0
• Receive mailbox (EF) Data block DB3 from DW0
• Flag bytes FY 64 to 77 are used as buffer areas.
EWA 4NEB 812 6120-02
13-3
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