Communication System Manual 3WN6 Circuit-Breakers
Copyright Siemens AG 1998. All rights reserved. Version1.0 (05/98)
38
The 3WN6 cyclic data on PROFIBUS-DP are handled directly in bytes (octets) 9, 10, 11 and 12 of
the PLC I/O area. Specific message numbers are not required (see Fig. 9, page 38 and page 52).
OCTET
(Byte)
3WN6 cyclic output data 3WN6 cyclic input data
9 High-order byte
of status word
Various
signals
High-order byte
of main control
word
Direct control
commands
10 Low-order byte
of status word
Low-order byte
of main control
word
11 High-order
byte of main
actual value
Current in
max. loaded
phase
High-order byte
of main setpoint
Setting current
I
r
12 Low-order byte
of main actual
value
Low-order byte
of main setpoint
Fig. 9: Cyclic data transfer
Legend: Octet = Byte
(Bytes 5, 6, 7 and 8 are also referred to as octet strings = OS)
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