Communication extension card
PROFINET communication card
-48-
Master
station
device
Slave station
device 2
RJ45
RJ45
Slave station
device 1
RJ45
RJ45
Slave station
device n
RJ45
RJ45
Switch
Figure 4-3 Electrical wiring diagram of the star-shaped network topology
4.4 Communication
4.4.1 Packet format
Table 4-3 describes the structure of an RT frame (non-synchronous).
Table 4-3 Structure of an RT frame
Data
header
Ethernet
type
VLAN
Ethernet
type
Frame
identifier
RT user
data
Period
counter
Data
state
Transmission
state
FCS
2 bytes
2
bytes
2 bytes 2 bytes
36–1440
bytes
2 bytes
1
byte
1 byte
4
bytes
0x8100
0x8892
VLAN flag
APDU state
Data header
7-byte
preamble
1-byte synchronization
information
6-byte source MAC
address
6-byte destination MAC
address
Table 4-4 describes the structure of the IRT frame (synchronous).
Table 4-4 Structure of an IRT frame
Data header
Ethernet
type
VLAN
Etherne
t type
Frame
identifie
r
IRT
user
data
FCS
7-byte
preambl
e
1-byte
synchron
ization
6-byte
source
MAC
address
6-byte
destinati
on MAC
address
2 bytes
2
bytes
2 bytes 2 bytes
36–14
40
bytes
4
bytes
Содержание Goodrive350 Series
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