8 Communication
8.2 Modbus
153
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
8.2.9
Modbus Diagnosis
The diagnostics function for Modbus TCP, Modbus UDP and Modbus RTU, see chapter 6.5.4, enables analyz-
ing the parameters and the communication and resetting diagnostics counters.
8.2.9.1
Modbus TCP Diagnosis
Figure 8-5
Modbus TCP Diagnosis
Parameters for Standard Server and User-port Server
•
Port number:
Standard port 502 and configured user port
•
Maximum connections:
For user port number 502: 4 connections via standard
port 502
For other user port numbers: 2 connections via standard
port 502 and 2 connections via the user port
•
Used connections:
Number of connections that are actually used
•
Connection overflows:
Counter of the attempts to establish more connections than
allowed;
Number of allowed connection attempts:
For user port number 502:
≥
5 connection attempts via stan-
dard port 502,
For other user port numbers:
≥
3 connection attempts via
standard port 502 and/or
≥
3 connection attempts via user
port
•
Access rights:
Default: Full
•
Communication supervision time:
Default: 60 000 ms
MAN_SICAM_IO-Unit_7XV5673_US.book Page 153 Thursday, May 10, 2012 10:59 AM
