Engineering and remote access
7.8 OPC UA server
Power supply system SITOP PSU8600
346 Manual, 09.2018, A5E36758446-5-76
OPC UA provides the option of collectively transferring modified actual values in the form of
a subscription. The minimum pole interval of such a subscription is 100 ms. A maximum of
150 data nodes can be simultaneously monitored, independent of whether these data nodes
are assigned one or various subscriptions.
OPC UA does not support any type of realtime communication, neither for actual values
(read data) nor for setpoints (written data). As a consequence, it is not possible to specify an
update/refresh rate or a maximum data flow rate.
Recommissioning after a basic device has been replaced - or after restoring the
factory settings
If, for service reasons it is necessary to replace the basic unit - or store the factory settings,
then please observe the following notes:
1. Brand new basic units or basic units, where the factory settings have been restored, have
no IP address. However, this is generally necessary so that the device can be accessed
using OPC UA. Proceed as described in Chapter "Configuring the PROFINET interface
(Page 287)", Section "Communication interface" to assign the device a certain IP
address.
2. The configuration must be loaded to the device. This can be done in the following ways:
● Proceed as described in Chapter "Loading and saving device configuration (Page 303)"
to load a valid configuration into the device (previously saved via web server).
● Load a valid configuration to the device via OPC UA. Ensure that the necessary user
account is available in the device for access via OPC UA. The latter can be created using
a web server, see Chapter "User administration (Page 291)".
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