8 Communication
8.2 Modbus
154
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
Parameter for Connections
•
Server port:
Server port number of the current connection in the respec-
tive column; if "0" is displayed, the connection is inactive or
down
•
Client IP:Port
Last or current IP address and port number of the client
•
Bytes received:
Total number of bytes received by the TCP port
•
Bytes sent:
Total number of bytes sent to the TCP port
•
Correct messages:
Total number of messages received that were detected as
valid Modbus messages
•
MBAP header error:
Error in the MBAP header: incorrect protocol ID or implausible
length of data
•
Exception responses:
Counters of the transmitted exception response messages
(see chapter 8.2.2)
•
Number of access rights violations:
Total number of write accesses received if the parameter
Access rights for port xxx
is set to
Read only
of the asso-
ciated TCP port (e. g. 502) in the
Communication Ethernet
input/output window (see chapter 6.3.3.6)
8.2.9.2
Modbus UDP Diagnosis
Figure 8-6
Modbus UDP Diagnosis
Parameter
•
Operating mode
Modbus UDP
•
Port number:
51000
•
Communication supervision time:
Default: 80 ms
•
Access rights:
Default: full
Counter
•
Received bytes:
Total number of received bytes from UDP port
•
Sent bytes:
Total number of sent bytes to UDP port
•
Good messages:
Total number of received telegrams that were detected as
valid Modbus telegrams
•
Bad messages:
Total number of telegram errors
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