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I-7550E PROFIBUS/Ethernet Converter User Manual
(Version 1.00, June/2014)
PAGE: 17
PROFIBUS Master Device in data exchange mode, and the I-7550E will start
Ethernet service according to the setting of TCP/UDP(Please refer to section 5.2).
When the I-7550E receives the data from PROFIBUS Master Device, data will be
put in PROFIBUS FIFO buffer, and when receives data from Ethernet device it
will be put in Ethernet FIFO buffer. In each cyclic communication the I-7550E
will send data from PROFIBUS FIFO buffer to Ethernet Device and transfers data
from Ethernet FIFO buffer to PROFIBUS Master Device, as shown in
Figure 12 .
PROFIBUS
Master
I-7550E
PROFIBUS/Ethernet Converter
Cyclic Data
exchange
Output Data
(Max:240 Bytes)
Byte 0
Byte 239
.
.
.
.
.
.
.
.
.
Input Data
(Max:240 Bytes)
Byte 0
Byte 239
.
.
.
.
.
.
.
.
.
Internal
memory
Ethernet
FIFO
PROFIBUS
FIFO
E
th
er
n
et
D
ev
ic
e
D
at
a
Cyclic Data
exchange
Receive
Data
Figure 12 Data exchange between PROFIBUS Master and the I-7550E

System setting Module
The I-7550E reserves the first 20 Bytes of Input/output data area for system
control. So when the use configures the I/O length of PROFIBUS, the “System
setting module” must be selected first. The user needs to fill these values of output
area of system setting module, and the I-7550E will handle the data according to
these value. When the I-7550E receives the data from Ethernet device, it will put
the information in the input area of “System setting module”. Please refer to
section 3.3.1 and 3.3.2 for more detail.