Publication 1747-RM001G-EN-P - November 2008
SLC Communication Channels 13-9
DH-485 Channel Status
For SLC 5/03 (OS302, Series C and higher), SLC 5/04 (OS401, Series C and
higher) and SLC 5/05, channel status data is stored in the diagnostic file
defined on the Channel Configuration screen. Table 13.3 on page 13-9
explains information regarding the diagnostic counter data displayed.
Double-click on the Channel Status
Icon Located beneath the
Configuration icon to bring up the
Channel Status screen.
See Table 13.3 for details concerning
the DH-485 Channel Status Screen.
Table 13.3 SLC 5/03 Channel 1 and SLC 5/03 and Higher Channel 0 DH-485 Channel Status
Status field Bytes Displays the
Messages Received 0,1 Number of error-free messages that the station has received.
Messages Sent 2,3 Number of messages sent by the channel.
Messages Retry 4 Number of messages resent due to errors.
Retry Limit Exceeded 5 Number of times that the processor exceeded its retry limit in trying to send a message.
No Memory Sent/NAK 6 Number of times the processor could not receive a message because it did not have enough
memory.
No Memory
Received/NAK
7 Number of negative acknowledgements received by the processor.
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