Modbus Channel Attributes - ABB COM600 series 5.0 Technical Reference Manual

1MRS758690
6.3.2.
COM600 series 5.0
Master Protocols (Ethernet) and Applications Technical Refer-
ence Manual

Modbus channel attributes

Table 6.3.2-1 Modbus channel attributes
Name
In use
Diagnostic counters(TCP
channel)
Transmitted telegrams
Failed transmissions
Transmitted commands
Transmitted replies
Received messages
Buffer overflow errors
TCP connect
TCP accept
Value or Value range/ Default
0 = Not in use, the line commu-
nication is stopped
1 = In use
Default: 1
Description
Data type: Integer
Access: No limitations
The state of the line - whether
it is in use or not. When a line
is not in use, no data can be
transmitted on it, and no data
is received from it. The line
attributes can be read as usual.
Generally, a line must be taken
out of use by setting this attrib-
ute to 0 before the line attrib-
utes can be written. When a
line is stopped by setting the IU
attribute = 0, all data transmis-
sion on the line ceases. How-
ever, before that, the protocol
stack executes to the end all
on-going data transactions. For
example, the polling of the sta-
tion in turn is completed.
Data type: Integer
Access: Read-only
The number of transmitted
telegrams.
Incremented each time a mes-
sage transmission to the Mod-
bus channel fails for some
reason.
The number of transmitted
commands.
The number of transmitted
replies.
Incremented each time the
Modbus OPC Server receives
a message from the Modbus
channel.
The number of times there has
been a buffer overflow.
Number of TCP connection
requests.
Number of accepted TCP con-
nection requests
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