matrikon opc server for allen-bradley 用户手册
Matrikon OPC Server for Allen Bradley
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4.5.6 D
EAD
-
BAND
Some OPC servers support dead-band for updates from analog data sources. The dead-band
value is a percentage of full-scale deflection and so the high and low limits for the item must be
known ahead of time. Dead-band only affects updates between an OPC client and a server. It has
no effect on communication between an OPC server and its respective device(s).
value is a percentage of full-scale deflection and so the high and low limits for the item must be
known ahead of time. Dead-band only affects updates between an OPC client and a server. It has
no effect on communication between an OPC server and its respective device(s).
4.5.7 A
DVISE
L
OG
Choose Advise Log from the View menu to display a log of ongoing I/O transactions. Right-
click on the window and choose “Clear Log” to clear the log. Use the options to keep the
window above all other windows in the desktop and to keep the most recent entry visible at all
times.
click on the window and choose “Clear Log” to clear the log. Use the options to keep the
window above all other windows in the desktop and to keep the most recent entry visible at all
times.
4.6 W
RITE
C
ONTROL
V
ALUES
Matrikon OPC Explorer allows the user to write control values to items in an OPC group. Select
the desired items in the list view and choose “Write Values” from the Item menu. In the dialog
box, enter the control values to be written in the “New Value” column. Specify the data types of
for the control values in the “Data Type” column. Use the checkboxes to avoid writing to
individual items. When ready, click the OK or Apply button to perform the write.
the desired items in the list view and choose “Write Values” from the Item menu. In the dialog
box, enter the control values to be written in the “New Value” column. Specify the data types of
for the control values in the “Data Type” column. Use the checkboxes to avoid writing to
individual items. When ready, click the OK or Apply button to perform the write.
Control values may be written to items regardless of whether they or the group that they
are in are active or inactive. If the items and the group containing the items are both
active then the written control value should appear when the next update occurs. Also,
some OPC servers may contain read-only item. Values written to these items will be
discarded.
are in are active or inactive. If the items and the group containing the items are both
active then the written control value should appear when the next update occurs. Also,
some OPC servers may contain read-only item. Values written to these items will be
discarded.
Matrikon OPC Explorer also contains a Signal Generator to write ramp ing control values to OPC
items. Choose the “Signal Generator” tab in the “Write Values” dialog box. Enter the high and
low limits and the increment factor for the ramp wave. Finally, enter the time period in
milliseconds and press Start. Press Stop or close the dialog box to finish writing the ramp wave.
items. Choose the “Signal Generator” tab in the “Write Values” dialog box. Enter the high and
low limits and the increment factor for the ramp wave. Finally, enter the time period in
milliseconds and press Start. Press Stop or close the dialog box to finish writing the ramp wave.
Note