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9.2.6
Diagnosis
These variables serve diagnostics and tracking purposes of the plant via OPC UA.
Diagnostics - Presence
Table 9- 11
Path
Data type
Access
Description
Possible values
Diagnostics - LastAccess
These variables supply various information on the last successful transponder access or
command.
Please note that these variables supply logically related information. With successful
transponder access, the contents of the "Time stamp" will be written last; all other supported
"LastAccess" variables are filled first. These variables can thus serve as a trigger for an OPC
UA client in order to query the other variable values.
If it is not possible to determine in time that variables can be queried completely by the client
before the next transponder access takes place and variables are written with new values
again from the process, usage is not possible. If this is not possible, use the
"AutoIdLastAccessEvent" events, which are also supported by the communication modules.
SIMATIC RF166C
Operating Instructions, 12/2019, C79000-G8976-C578-01
Presence
Root/Objects/DeviceSet/Read_point_x/RuntimeParameters/Diag
nosis/Presence
UInt16
R
Shows the presence of transponders.
The prerequisite is that the reader supports "Presence" mode
and is operated in this mode, and that the option "Parallel" or
"Diagnostics" is set in the WBM.
•
•
•
0: There is no transponder in the antenna field
1: There is at least one transponder in the antenna field
>1: Exact number of transponders (if supported by the read-
er)
Programming via OPC UA
9.2 OPC UA variables
109
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