SMA OPC SERVER - Manual (Page 17)

SMA Solar Technology AG Configuration
User Manual OPCServer-BEN100813 17
5.6.1 Setting the Scanning Cycle of Sunny WebBox Devices
Set the scanning cycle for the SMA OPC Server to scan instantaneous values from the registered
Sunny WebBox devices. Thus, all Sunny WebBox devices will be scanned simultaneously at the set
time interval.
1. Select the "OPC settings" tab.
2. In the "Scanning cycle for WebBoxes (sec.)" field, enter the time span in seconds in which the
Sunny WebBox devices should be asked for data (default: 60 sec.). For recommended
scanning cycles for Sunny WebBox devices please refer to the following table:
Duration of instantaneous value update
The time needed to update the instantaneous values depends on the following items:
• Setting the scanning cycle in the SMA OPC Server Configuration
• The number of Sunny WebBox devices and connected devices of the PV plant
• The specific update speed of each individual device
Data traffic via the RPC interface
The SMA OPC Server communicates with the Sunny WebBox via the RPC interface. In
order to avoid a large amount of data traffic via the RPC interface, select a time span as
high as possible (> 60 seconds) in which the Sunny WebBox devices will be asked for
data. You will find the recommended scanning cycle for Sunny WebBox devices in the
table on page 18.