matrikon opc server for allen-bradley User Manual
Matrikon OPC Server for Allen Bradley
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Although the OPC server may supply data changes to Matrikon OPC Explorer at the update rate
of the group, a global setting specifies the refresh rate for the display in OPC Explorer. Choose
“Update Speed” from the View menu and select one of the four available options: High, Normal,
Low, or Paused. If the update speed is “Paused” then the user will have to refresh the display
manually (F5).
of the group, a global setting specifies the refresh rate for the display in OPC Explorer. Choose
“Update Speed” from the View menu and select one of the four available options: High, Normal,
Low, or Paused. If the update speed is “Paused” then the user will have to refresh the display
manually (F5).
In the item display, the Value field shows the real-time value for the item. The Quality field
indicates whether or not this value is valid, and why (see the annex for a list of quality values).
The Timestamp field indicates how “fresh” the value is (the time that it was received from the
data source).
indicates whether or not this value is valid, and why (see the annex for a list of quality values).
The Timestamp field indicates how “fresh” the value is (the time that it was received from the
data source).
The information panel at the bottom of the window displays status information about the selected
server and group. Choose “Info Panel” from the view panel to hide and show this panel.
server and group. Choose “Info Panel” from the view panel to hide and show this panel.
4.5.4 I/O M
ETHOD
Matrikon OPC Explorer allows the user to specify the method of communication to use with a
group. Synchronous I/O is generally reserved for testing and special operations. Explorer also
allows the user to choose between the 1.0a or 2.0 style of asynchronous I/O. The normal
recommended setting is “Asynchronous I/O”, which attempts to use 2.0 first, and 1.0a if that
fails.
group. Synchronous I/O is generally reserved for testing and special operations. Explorer also
allows the user to choose between the 1.0a or 2.0 style of asynchronous I/O. The normal
recommended setting is “Asynchronous I/O”, which attempts to use 2.0 first, and 1.0a if that
fails.
4.5.5 T
IME
B
IAS
Some OPC client applications may use the OPC server time bias setting as a storage area for
time zone information. This information might be used to display server timestamps in a time
zone other than UTC or the local time zone. Matrikon OPC Explorer does not use this
information, but allows the user to write the information to the server as a test.
time zone information. This information might be used to display server timestamps in a time
zone other than UTC or the local time zone. Matrikon OPC Explorer does not use this
information, but allows the user to write the information to the server as a test.