Sck-C-Modbus Solarcheck Communication Module; Function; Data Acquisition And Transfer; Block Diagram Of The Sck-C-Modbus Solarcheck Communication Module - Phoenix Contact SCK-C-MODBUS User Manual

5

SCK-C-MODBUS Solarcheck communication module

105608_en_00
5.1

Function

The communication module collects the data from all connected measuring modules and
forwards it to a higher-level controller via RS-485 Modbus RTU.
At the same time, the connected measuring modules are supplied with power via the com-
munication cable (SCK BUS) between the measuring modules and the communication
module.
This distributed structure means that a power supply is not required in the string combiner
box in the field.
T1
T2
T3
T4
T5
T6
T7
T8
Figure 5-1

Block diagram of the SCK-C-MODBUS Solarcheck communication module

5.2

Data acquisition and transfer

The Solarcheck communication module acquires the data from all Solarcheck measuring
modules connected in parallel. Each measuring module is connected to a separate data
input (T1...T8). This therefore creates a star wiring configuration. A maximum of eight mea-
suring modules can be connected to a communication module. A proprietary protocol is
used for data transfer between the measuring modules and the communication module. At
the same time, the communication cable is also used to supply power to the measuring
modules in the field. The data is made available to the higher-level control unit via an RS-
485 interface using Modbus RTU.
SCK-C-MODBUS Solarcheck communication module
A
RS-485
B
GND2
C
GND2
+24 V
+24 V
DC
DC GND1
GND1
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