By means of the OPC function, data (generally parameters and status values) can be retrieved via an OPC server at adjustable intervals and written to the OMNITREND database. For using the OPC client, a valid OPC license must be available. OPC clients can be operated only with an OMNITREND Web server; operation with the single-user version is not possible. Prueftechnik also offers an OPC server; please contact our Sales department.
Configured OPC clients are automatically started when the OMNITREND Web server is started (connection set up to the OPC server and cyclical retrieval of data).
Only one configuration to an OPC server may exist at any given time.
Each OPC server can maintain connections to multiple online devices (SignalMaster, VIBNODE, ...). Each device has online data made known to the OPC server in the form of "OPC server items". These OPC server items can be assigned to individual measurement tasks of a database, with this assignment occurring once only and a reassignment being possible only after deletion of this connection. For measurement tasks of the type vibration, bearing etc., multiple assignments to a measurement task are also possible, since here multiple parameters (RMS. Peak, Peak-Peak, ...) exist. This is detected and the assignment can be defined by an expanded selection.
OPC Configuration offers a survey of all created OPC clients in the database. The table of the OPC clients in the OPC configuration dialog box contains the following information:
Name: Name of the OPC server to which the OPC client is connected.
Host: IP address of the OPC server to which the OPC client is connected.
Sampling rate (seconds): Sampling rate of the OPC client in seconds. In this interval data are cyclically requested from the OPC server and saved in the database (to the extent the data deviate from the adaptive storage level! See "Setting OPC Information").
Connection state: Indicates the connection status of the OPC client to the OPC server ("Connected" or "Disconnected").
Click "Add" in the OPC configuration to set up a new OPC client.
Click "Edit" to adapt the currently selected client; the changes will be applied only after reconnecting, however.
Also delete clients, disconnect from the server or, if the configuration has been changed, activate it by an update.
OPC information can be linked to measurement tasks as follows:
via the menu item "Tools - OPC - Set OPC Information..."
via a context menu
The corresponding measurement task must be selected in the tree for which you wish to define the OPC information.
There are three types of measurement tasks (single, vibration, bearing) for which different types of OPC information can be set.
With the single type, there is only one parameter value (e.g. temperature, speed ...). To link a measurement task to the OPC server item, you must configure the following parameters:
OPC server: Specify the OPC server to which the measurement task is to be linked. This list contains all OPC servers to which an OPC client configuration is connected.
OPC device: Specify the OPC device (within the selected OPC server) to which the measurement task is to be linked.
OPC item: Specify the OPC item (within the selected OPC server and OPC device) to which the measurement task is to be linked.
Adaptive storage level: Setting an adaptive storage level to 0 generally saves to the database all measurement values supplied by the OPC server. Setting an adaptive storage level not equal to 0 saves only that value that deviates from the value last saved by the value set.
Remark:
When an OPC client is started, the first value supplied by the OPC server is always saved.
In addition to the adaptive storage level, on the start of each new day (after 0:00) the first value arriving from the OPC server is saved!
OPC server items already assigned to other measurement tasks are no longer displayed in the "OPC item" selection box and can therefore no longer be selected (no duplicate assignments possible!). To apply the changes also in a previously started OPC client, you must stop and restart the OPC client and or you must update the OPC client.
Vibration type measurement tasks can contain three parameters (Zero Peak, Peak-Peak and RMS). To each of these parameters OPC items within an OPC server and within an OPC server device can be assigned. For each of these parameters a separate adaptive storage level can also be specified.
Bearing type measurement tasks can contain three parameters (Max, Carpet and RPM). To each of these parameters OPC items within an OPC server and within an OPC server device can be assigned. For the parameters Max and Carpet an adaptive storage level can be specified. RPM is also saved, depending on the storage of Max and Carpet values.
OPC information can be set only for the following measurement tasks:
Details: Overall vibration and bearing values:
Overall velocity >600
Overall velocity >120
Speed, mean
Speed, max
Speed, min
Overall displacement >120
Gear vib severity >120
VSC gear vib severity >120
Cavitation effic. effect
Overall accel > 120
Acceleration, mean
Acceleration, max
Acceleration, ,in
Overall accel. >120
Cavitation effic. Effect
Cavitation effic. effect
Cavitation material effect
Speed (Speed, Speed Max, Speed Min)
Temperature
Process parameter
General AC-Voltage overall
DC Level Measurement
Use this function to remove OPC information (or OPC items) from a measurement task. To apply the changes also in a previously started OPC client, you must stop and restart the OPC client and or you must update the OPC client.