Power Supply - Phoenix Contact SCK-C-MODBUS User Manual

105608_en_00
5.2.3.4 Compatibility with previous modules
The Revision 03 Solarcheck communication module is backwards compatible with its pre-
decessor (Revision 02). Furthermore, the device is compatible with all existing Solarcheck
measuring modules, including devices from the previous generation (SCK-M-8S-20A,
Order No. 2901672).
This ensures that new and old-generation devices can be operated on the current commu-
nication module. Mixed operation of devices from both generations is possible on a Revi-
sion 03 communication module.
Furthermore, this ensures that the existing programming of the higher-level controller does
not have to be modified if a device is replaced.
5.3

Power supply

In addition to collecting data, the communication module also supplies power to the con-
nected measuring modules. The power supply for the communication module and the con-
nected measuring modules therefore has to be incorporated in the design.
– 24 V DC input voltage (-10% ... +25%)
– For current consumption, all connected measuring modules must also be taken into
consideration
Let us assume 20 mA for the communication module and the sum of the typical current con-
sumption of all connected measuring modules. To account for the current peaks, the result
must be multiplied by 3. This calculation applies if 24 V is supplied. Otherwise, please refer
to the current consumption diagrams for the modules in "Design of the power supply" on
page 61.
SCK-C-MODBUS Solarcheck communication module
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