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 6120-02b
13-3
Summary of Contents for SIMATIC S5-100U
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Page 505: ...B Dimension Drawings EWA 4NEB 812 6120 02b ...
Page 515: ...C Active and Passive Faults in Automation Equipment EWA 4NEB 812 6120 02b ...
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Page 523: ...D Information for Ordering Accessories EWA 4NEB 812 6120 02b ...
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Page 531: ...E Reference Materials EWA 4NEB 812 6120 02b ...
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Page 535: ...F Siemens Addresses Worldwide EWA 4NEB 812 6120 02b ...
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Page 543: ...Index EWA 4NEB 812 6120 02b ...
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