Step 1: Know Your S7-1500's Limitsĭepending on which model of S7-1500 you have, there will be different limits with respect to number of OPC UA sessions (connections) supported, number of subscriptions per session, maximum items per request and other OPC UA specific limits. If you'd rather not have to use the S7 PLC's OPC UA server, we do offer a Siemens S7 Plus Ethernet driver that can address S7-1500 and S7-1200 PLCs symbolic memory addresses without going through OPC UA. For projects with high security requirements, OPC UA is the only choice for integrating S7-1500s. With Report-By-Exception (RBE) support, the ability to transfer arrays and a larger maximum packet size, OPC UA is Siemens preferred method of integrating S7-1500 controllers due to the improvements in efficiency.Īnd the security available with OPC UA with user authentication and high encryption available, there's really no comparison. ![]() The OPC UA interface in the S7-1500 offers a few benefits over the traditional Siemens TCP (RFC1006 ISO over TCP) communication method: With the S7-1500 series of PLCs, Siemens has an embedded OPC UA server right in the controller, opening the door for faster and more efficient communications that are more reliable and secure. As the Siemens PLC families have grown and evolved over the years, so have the communication protocols that can be used to extract the data from these controllers. ![]() Ĭommunicating with Siemens PLCs using the TOP Server is not a new concept and has been supported since the early days of the server, in the form of the Siemens TCP Ethernet driver and various serial drivers included in the TOP Server Siemens Suite. T his post focuses specifically on the general steps required to integrate S7-1500 controllers by connecting to their embedded OPC UA server using TOP Server for AVEVA. So we added a Siemens Plus Suite to enable connectivity to new and legacy Siemens devices. And, with that adoption of those controllers, users have been asking for connectivity via the symbolic optimized block addressing. In recent years, many of our users have let us know they are adopting the latest Siemens technology, particularly S7-1500 controllers.
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