Automatic Cache Update

The following information applies to the OPC server running on a PC platform. This information is not relevant when running on a CE platform

This option causes the OPC Server to automatically update its cache after write operations.

According to OPC Specification an OPC Server shall not update its cache automatically after writing a new value. After a successful write operation the cached value remains the same and is not updated until the next scan cycle. As this behaviour causes problems in some applications the Beckhoff OPC Server provides an option to change this behaviour.

This option is turned off by default, so that the Beckhoff OPC Server operates correctly according to OPC Specification. To change the cache update behaviour start the TwinCAT OPC Configurator, Open the "OPC Server Settings" tab and check "AutoUpdateWriteCache"