Siemens SIMATIC ET 200AL - Notes on Configuration Limits When Using Server Interfaces

OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 12/2017, A5E03735815-AF
217
Access table
"Accessible from HMI/OPC UA" must be set if access over OPC UA is to be possible at all.
"Writable from HMI/OPC UA" must be set to allow an OPC UA client to write a tag / DB
element.
Please see the table for the resulting access right.
Table 9- 11 Access table
OPC UA XML
STEP 7 (TIA Portal), for example tag table
AccessLevel
Accessible from HMI/OPC
UA
Writable from HMI/OPC
UA
Resulting access right
0
x
x
No access
x
0
x
No access
1 Enabled x Read only
2
Enabled
Disabled
No access
3
Enabled
Disabled
Read only
2
Enabled
Enabled
Write only
3
Enabled
Enabled
Read+write
(x = don't care)
9.3.5.3
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
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.