Patent ID: 8549065

Claim:
A method for communication between a client and a server in a client/server system using an OPC UA protocol, comprising: making a OPC UA service call for interaction between an OPC UA client and an OPC UA server; and carrying out communications between the OPC UA client and the OPC UA server via transactions integrated in OPC UA service calls in a transaction context using a transaction management component, such that OPC UA clients arranged to carry out transactions each communicate with an OPC UA server using transactions wherein for communication between an OPC UA client and an OPC UA server using transactions: configuring an OPC UA session; calling a method for starting a transaction by the OPC UA client; receiving, at the transaction management component of the OPC UA server, information relating to the start of a transaction; manipulating data at the OPC UA client and checking the permissibility of the manipulation by the transaction management component; and calling, in order to conclude the transaction, via the OPC UA client, a method for confirming the transaction and, after corresponding checking by the transaction management component, inducing the manipulation of data in an addressed device.