Limitations

The maximum:

  • Number of nodes that can be published in the BMENUA0100 OPC UA Server data access Address space is 100000 nodes.

  • Memory amount that can be allocated to the BMENUA0100 OPC UA Server is 192 MB.

NOTE: If either limit is exceeded, the server Address Space state enters into a LimitsExceeded state.
NOTE: The time needed to establish time subscription may significantly depend on the number of items and the number of connected clients.

Other limitations, the context in which they occur, and their consequences if exceeded are set forth below:

Limit

Value

OPCUA Service

Service Parameter

Effects

Cumulative Session Count

10

CreateSession

(Not Applicable)

Bad_TooManySessions service result code

Minimum Session Timeout

30 s

CreateSession

Requested SessionTimeout

revisedSession Timeout

Cumulative Session timeout

3600 s

CreateSubscription

Requested SessionTimeout

revisedSession Timeout

Maximum Cumulative Subscription Count

40

CreateSubscription

(Not Applicable)

Bad_TooManySubscriptions service result code

Minimum Publishing Interval

250 ms1

20 ms2

CreateSubscription

Requested Publishing Interval

revisedPublishingInterval

Maximum Publishing Interval

10 s

CreateSubscription

Requested Publishing Interval

revisedPublishingInterval

Maximum Subscription Lifetime

300 s

CreateSubscription

Min(Requested Publishing Interval, 3600000) * Requested LifetimeCount

revisedLifetimeCount

Maximum Notifications Per Publish

12500

CreateSubscription

maxNotificationsPerPublish

Notifications maximum capacity is thus (1000/ revisedPublishingInterval) * 1000 notifications per second.

Minimum Sampling Interval

125 ms1

20 ms2

CreateMonitoredtems

MonitoringParameters. SamplingInterval

revisedSampling Interval

Maximum Message Queue Size

100

CreateMonitoredtems

MonitoringParameters. QueueSize

revisedQueueSize

Maximum Cumulative Monitored Items Count

500003

20002

CreateMonitoredtems

(Not Applicable)

Bad_TooManyMonitoredItems service result code

Maximum Subscriptions Per Session

4

–

–

–

Maximum Monitored Items Count Per Subscription

25000

–

–

–

1. If Fast Monitoring is disabled.

2. If Fast Monitoring is enabled.

3. If Fast Monitoring is disabled, and the server is configured with:

  • a sampling interval of at least 1 second, and

  • a publishing interval of at least 1 second.