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Chapter 10. OPC UA Server
GFK-2224Q January 2017 175
OPC UA Server – Service Request – START
This function starts the OPC UA Server. If the OPC UA server configuration files and certificates have been
cleared or have not yet been generated, they are generated when the server starts. If previous configuration
files and server certificates exist, they are used without change. The server startup process also adds all
published variables stored on the controller to the server’s address space, up to the variable and element count
limit.
Note: This request can only be successfully performed when the OPC UA server is stopped.
Parameters for the START function service request function block are:
Parameter Summary
Data Direction
(LD perspective)
16#0001 OPC UA protocol IN
16#0000 START request IN
-1440 to 1440 Time Zone Offset IN
If the SVC_REQ does not pass power, the operation did not complete. The time zone offset adjusts the OPC UA
server time zone. The Controller’s Time of Day clock must be synchronized to local time and the time zone
offset is your location’s offset relative to Universal Time Coordinated (UTC, formerly known as Greenwich Mean
Time or GMT).
Example:
Note: In this example, a Time Zone Offset of -240 was used, meaning local time is UTC time
minus 240 minutes (4 hours).