Opc Ua Variables; Description Of The Variables - Siemens SIMATIC RF185C Operating Instructions Manual

Programming via the OPC UA interface

9.2 OPC UA variables

PC
Polarization
Strength
Diagnosis - Logbook
LastLogEntry
LogColumns
DigitalIOPorts
DigitalInputs
DigitalOutputs
You can find the specified functions under the following path in the address area of a read
point:
● DeviseSet > Readpoint_x1 > IOData
● DeviseSet > Readpoint_x1 > RuntimeParameters
9.2 OPC UA variables
9.2.1

Description of the variables

OPC UA variables represent a simple way to query information from the communications
modules or make settings on the communications modules. Almost all OPC UA clients
support variables. However, you need to observe the following points when using variables:
The restriction of the update rate by the "Sampling" interval and by the "Publishing" interval
is common to all OPC UA variables. These are fundamental OPC mechanisms that can
define the intervals at which the values can be updated or queried via OPC UA. If the
intervals at which the values for a variable are updated from a process should be shorter
than the defined intervals, values can be overwritten before the query by an OPC UA client.
This problem is worsened by the use of logically related variables. If it is not possible to
determine in time that related variables can be queried completely by the client before
variables are written with new values again from the process, usage is not possible. If a
client supports events, make sure that these are used. The effects described above cannot
occur with events.
94
Protocol Control Word of the transponder that was accessed last.
This function is only supported by UHF readers.
Polarization with which the last command was executed on the transponder.
This function is only supported by UHF readers.
RSSI value with which the last command was executed on the transponder.
This function is only supported by UHF readers.
Various log information.
The last entry in the log.
The headers column of the log as formatted string
Digital IO ports
Digital inputs of the communications module
This function is only supported by the CI variants of the communications mod-
ules.
Digital outputs of the communications module
This function is only supported by the CI variants of the communications mod-
ules.
SIMATIC RF185C, RF186C, RF188C
Operating Instructions, 10/2018, C79000-G8976-C512-01