Modbus Serial Channel Attributes - ABB COM600 series User Manual

5.3.3.
56
COM600 series, Version 5.1
Modbus Serial Slave (OPC) User's Manual

Modbus Serial Channel attributes

Table 5.3.3-1 Modbus Serial Channel attributes
Property / Parameter
In Use
Diagnostic Counters
Transmitted Telegrams
Failed Transmissions
Transmitted Replies
Received Messages
Buffer Overflow Errors
Parity Errors
Overrun Errors
Checksum Errors
Framing Errors
Value or Value range/ Default
0 = Not in use, the channel
communication is stopped
1 = In use
Default: 0
1MRS756913
Description
Data type: Integer.
Access: No limitations.
Specifies whether the channel
is in use or not. When a chan-
nel is not in use, no data can
be transmitted on it, and no
data is received from it. The
channel attributes can be read
as usual. Generally, a channel
must be taken out of use by
setting this attribute to 0 before
the channel attributes can be
written.
When a channel is stopped by
setting the In use attribute to 0,
all data transmission on the
channel ceases. Before that,
the protocol stack executes to
the end all on-going data
transactions. For example, the
polling of the station in turn is
completed.
The number of transmitted
telegrams.
The number of failed transmis-
sions.
The number of transmitted
replies.
The number of received data
messages.
The number of times there has
been a buffer overflow.
The number of times a parity
error has occurred.
The number of times an over-
run error has occurred.
The number of times a redund-
ancy error has occurred.
The number of times a framing
error has occurred.