Subscription Parameters

UNINTENDED EQUIPMENT OPERATION

Do not change these protocol parameters, except on the advice of Technical Support for this product.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

[OPCUA ] Parameter

Description

Allowable Values

Default Value

ItemDeactivationDelay

Item deactivation time in seconds.

1 - 600

30 (seconds)

QueueSizePerItem

Maximum number of updates per item queued in the server before publishing.

1 - 10000

10

ReadAfterWrite

Determines if, after writing to an item, the driver performs a synchronous read of the same item.

This parameter can be useful in cases where the OPC UA server reports that a write was successful, when in reality the value of the item had not changed. In this case, the tag value on the graphics screen is updated to the written value if [Code]WriteLocal is set to 1 (default behavior). This is not correct.

Setting this parameter to 1 will make sure the driver will read the item value after the write is completed, and that the value on the graphics page will be updated to the correct one.

0 - the driver does not perform an item read after write

1 - the driver performs a synchronous read of the item after write

0

Subscription1PublishingInterval

Subscription 1 publishing interval in milliseconds.

Any positive value less than Subscription2
PublishingInterval if Subscription2
PublishingInterval is greater than 0.

400 ms

Subscription2PublishingInterval

Subscription 2 publishing interval in milliseconds.

Any positive value less than Subscription3
PublishingInterval if Subscription3
PublishingInterval is greater than 0.

0 ms

Subscription3PublishingInterval

Subscription 3 publishing interval in milliseconds.

Any positive value less than 86400000.

0 ms

Subscription1SampleRate

Subscription 1 sampling interval in milliseconds.

Any positive value less than 86400000.

0 - this parameter is not used. The sample rate will automatically adjust to half of the associated publishing interval.

You only need to set this parameter if a specific sampling rate is required.

Subscription2SampleRate

Subscription 2 sampling interval in milliseconds.

Any positive value less than 86400000.

0 - this parameter is not used. The sample rate will automatically adjust to half of the associated publishing interval.

You only need to set this parameter if a specific sampling rate is required.

Subscription3SampleRate

Subscription 3 sampling interval in milliseconds.

Any positive value less than 86400000.

0 - this parameter is not used. The sample rate will automatically adjust to half of the associated publishing interval.

You only need to set this parameter if a specific sampling rate is required.