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SMA Solar Technology AG
4 Commissioning and Configuration
4.1 Commissioning Steps and Requirements
Requirements:
☐
The devices of the PV system must be connected to the Cluster Controller and the
Cluster Controller must be commissioned (for information on connection and commissioning,
see the Cluster Controller installation manual).
☐
You must log in as installer to the Cluster Controller (for login to or logout of the
Cluster Controller, see the Cluster Controller user manual).
Procedure:
1.
Activate the Modbus server(s) and, if required, configure the communication ports
(for Modbus configuration, see the Cluster Controller user manual).
Allocation of unit IDs by activation of the Modbus servers
Upon activation of the Modbus servers of the Cluster Controller, unit IDs are assigned to
the SMA devices already connected to the Cluster Controller. The protocol types TCP/UDP
can be activated individually or together. If one or both of the servers are deactivated and
reactivated, the previously assigned Modbus Unit IDs are maintained.
2.
Change the unit IDs if, after activation of the Modbus servers, further SMA devices have
been added to the PV system or SMA devices have been replaced (see the following sec-
tions).
4.2 Information on Changing Unit IDs
You can change the unit IDs of SMA devices. A change is required, for example, if additional or
changed SMA devices are connected to the Cluster Controller after activation of the Modbus
servers. By way of the automatic detection of the PV system, additional or changed devices are
assigned the Modbus unit ID = 255 (NaN). On the other hand, it may be necessary to change the
unit IDs if a restructuring of the system topology is required, for example, to better map the physical
arrangement of the devices in the Modbus protocol.
Depending on whether you wish to change individual unit IDs or restructure the entire system topol-
ogy, you have two options:
• Changing Unit IDs via the gateway (recommended for changing individual Unit IDs)
• Changing Unit IDs via an XML file (recommended for restructuring of the system topology)
Both of these methods are described in separate Sections.
Technical Information
Commissioning and Configuration
ClusterController_Modbus-TI-en-18
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