OPC UA Server Configuration Settings

To allow an OPC UA Client to access CODESYS variables, you need to configure the OPC UA Server. This is done in the configuration file ‎CODESYSControl.cfg‎ which is stored in the installation directory of CODESYS in the ‎\GatewayPLC‎ directory.

Sample configuration

[CmpOPCUAServer]
NetworkAdapter="eth0"

Table 484: placeholder
Key	Default Value	Runtime System (and higher)	Description
`‎MaxNodesPerRead‎`	100	V3.5 SP 17	Defines the number of nodes which are accepted by the corresponding OPC UA service. The `‎OperationLimits‎` of the OPC UA address space are also taken into account. For more details, see the OPC UA specification.
`‎MaxNodesPerHistoryReadData‎`	100	V3.5 SP 17
`‎MaxNodesPerHistoryReadEvents‎`	100	V3.5 SP 17
`‎MaxNodesPerWrite‎`	100	V3.5 SP 17
`‎MaxNodesPerHistoryUpdateData‎`	100	V3.5 SP 17
`‎MaxNodesPerMethodCall‎`	100	V3.5 SP 17
`‎MaxNodesPerBrowse‎`	100	V3.5 SP 17
`‎MaxNodesPerRegisterNodes‎`	100	V3.5 SP 17
`‎MaxNodesPerTranslateBrowsePathsToNodeIds‎`	100	V3.5 SP 17
`‎MaxNodesPerNodeManagement‎`	100	V3.5 SP 17
`‎NetWorkAdapter‎`		V3.5 SP7	Configures the network adapter which should be used by the OPC UA Server. Example: "eth0", "Ethernet Adapter" If a configuration does not exist, then all network adapters with a valid IP address are used.
`‎NetworkPort‎`	4840	V3.5 SP7	Configures the port used by the OPC UA Server.
`‎UseLoopback‎`	1	V3.5 SP7 Patch 2	Adds the loopback adapter as an OPC UA endpoint if it is missing in the configuration.
`‎AdapterUpdateRate‎`	5000	V3.5 SP15	Defines the interval in which the OPC UA Server reacts to changed network adapters. Ports are opened or closed depending on whether a network adapter is reconnected or has lost the connection.
`‎ItemMinSamplingRate‎`	100	V3.5 SP15	Defines the minimum sampling rate of the monitored variables (in ms).
`‎NumOfWorkerTasks‎`	-1	V3.5 SP16	Configures the number of worker tasks to be created. The default value -1 generates between 1 and (<number of CPU cores> - 1) worker tasks. The worker tasks are responsible for sampling the monitored variables.
`‎WorkerTasksDynamic‎`	2	V3.5 SP18	Defines whether OPC UA Server worker tasks should be created dynamically depending on the load or statically in order to optimize the start behavior: 0: Static 1: Generate, but pause and resume depending on the load 2: Generate and end depending on the load
`‎SchedulerResolution‎`	1	V3.5 SP17	Configures the resolution of the scheduler of the OPC UA Server (in ms)
`‎SessionsMax‎`	100	V3.5 SP17	Maximum possible number of sessions (only effective if greater than the start size). A session is an online connection of a client.
`‎SecureChannelsMax‎`	50	V3.5 SP19	Maximum number of communication channels supported by the server. Some channels may contain multiple sessions. If the number exceeds the value `‎SOCKET_FDSET_SIZE‎` - <number of open ports>, then not all channels can be used.
`‎ContinuationPointsPerSessionMax‎`	50	V3.5 SP17	Maximum possible continuation points per session. The parameter is required so that the client can subsequently browse for information.
`‎PublishRequestsPerSessionMax‎`	Unlimited	V3.5 SP17	Maximum possible publication requests per session
`‎SubscriptionsPerSessionMax‎`	Unlimited	V3.5 SP17	Maximum possible number of subscriptions per session
`‎PublishNotificationsMax‎`	Unlimited	V3.5 SP17	Maximum number of possible publication messages