OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
226 Function Manual, 11/2019, A5E03735815-AH
9.3.4.8 Notes on configuration limits when using server interfaces
When you use OPC UA server interfaces, you must comply with limits for the following
objects in line with the S7-1500 CPU performance class:
● Number of server interfaces
● Number of OPC UA nodes
● Load object data volume
● If you have implemented methods: Number of server methods or server method
instances
Configuration limits for OPC UA server interfaces and methods
The table below sets out the configuration limits for S7-1500 CPUs; these must also be
taken into account when you compile and load a configuration (up-to-date technical
specifications of the CPUs can be found on the Internet
(https://support.industry.siemens.com/cs/ww/en/ps/td
)).
A violation of configuration limits results in an error message.
Table 9- 4 Configuration limits for OPC UA server interfaces
Technical specification value
CPU 1510SP (F)
CPU 1511 (C/F/T/TF)
CPU 1512C
CPU 1512SP (F)
CPU 1513 (F)
CPU 1505 (S/SP/SP F/SP T/SP TF)
CPU 1515 (F/T/TF)
CPU 1515 SP PC (F/T/TF)
CPU 1516 (F/T/TF)
CPU 1507S (F)
CPU 1517 (F/T/TF)
CPU 1518 (F)
Use of imported companion specifications (information models)
Maximum number of OPC UA server
interfaces:
• "Companion specification" type
• "Reference namespace" type
• "Server interface" type
10
20
10
10
20
10
10
20
10
• Maximum number of OPC UA
nodes in user-defined server in-
terfaces
1000 5000 30000
• Maximum size of loadable OPC
UA server interfaces
1024 KB 5120 KB 15360 KB
Maximum number of usable server
methods or max. number of server
method instances (instructions
OPC_UA_ServerMethodPre,
20 50 100
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