OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
Communication
Function Manual, 05/2021, A5E03735815-AJ
213
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- 2
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)
See also
Consistency of CPU tags (Page 213)
Managing write and read rights (Page 208)
9.3.2.4
Consistency of CPU tags
"AccessLevelEx" attribute extends access properties
As of firmware version V2.6, the OPC UA server of the S7-1500 CPU supports not only the
attribute "AccessLevel" (see Coordinating write and read rights for CPU tags (Page 211)) but
also the attribute "AccessLevelEx" which, in addition to the already explained bits for read
access and write access, provides information on the consistency of a OPC UA tag. The new
attribute was introduced with version V1.04 of the OPC UA specification (Part 3, Address
Space Model).
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