Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 76)

A–B
8
Chapter
8–1
Host Communications
The Master workstation sends notification to the Host of any change of status
in the network. Usually these status records indicate that a workstation which
used to be communicating with the Master has been disconnected.
Status records consist of a 10-character prefix described below. However, all
status records carry 00 as the transaction number.
The ten character transaction prefix is explained in the following:
ccssrrqqtt Station number of the Concentrator or Master
ccssrrqqtt Station (workstation) number
ccssrrqqtt Number of retries required to transfer the record
ccssrrqqtt Sequence number used internally by the network
ccssrrqqtt Transaction number containing the SEND
In addition, a two-letter code follows the prefix. These codes are referred to
as Network Diagnostics. The codes are:
ON WORKSTATION ONLINE: the workstation indicated by the
Concentrator/ID and workstation number has just been attached to
the network. The Host may need to set up a new transaction
configuration for this workstation.
OF WORKSTATION OFFLINE: the workstation indicated by
Concentrator/ID and workstation number has ceased to respond to
polling. The Master or Submaster reports this problem.
MO ON-LINE: the workstation indicated has come on line as a Master.
CO Concentrator ON-LINE: the workstation indicated has come on line
as a Concentrator.
SO Submaster ON-LINE: the workstation indicated has come on line as
a Submaster.
DU DUPLICATE: the Master has detected a station with a duplicate
station number attempting to act as a Master. This MUST be
corrected before network operation.
AO Alternate OVERRIDE: this Master has detected another workstation
that is operating on the same network that has a smaller station
number than this one. This message indicates that this workstation is
giving up control and turning itself into an Alternate.
Network Status Records