Hach-Lange ORBISPHERE 6110 User Manual - Manual (Page 44)

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Configuration
5.6.2.2 OPC client
OPC (Open Process Control) is a software interface standard that allows Windows PC
programs to communicate with industrial hardware devices. The OPC client software is installed
on a PC and communicates directly with the OPC server embedded in the 6110 instrument.
To activate the link, check the OPC option on the ethernet configuration screen.
The first time this option is selected, a registration key is required. This can be found on the
case of the supplied CD-ROM. Enter the registration key.
Once validated, press the information button next to the OPC checkbox to display the CLSID
number. Enter the instrument ID (shown in the device name box in the configuration screen) and
the CLSID into the OPC client software on the PC to establish the two-way network link to the
instrument.
The OPC protocol identifies the data passed between server and client with a three level
hierarchy called an item. The item may contain data, error messages or warning messages.
To ensure total synchronization between PC and instrument, all modifications that are made to
data elements on the instrument are automatically sent to the client PC as a message item.
Three data items are sent in read-only format from the instrument to the OPC client:
• Package - Containing data about the currently selected package
• Measure - Containing data about the last measurement made by the instrument
• Calibration - Containing data about the current calibration parameters being used
Message items can be sent from the instrument to the OPC client and from the OPC client to
the instrument.
Figure 6 Ethernet configuration screen