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4 Integration with a ModBus RTU client
This equipment has been designed with commercial- and utility-sized PV plants in mind.
In this type of sites the ModBus RTU client(s) sending requests to the Transclinic is/are
normally …
1. … a set of PLCs (typically one PLC per inverter shelter) acting as local dataloggers.
In this case a Scada software will send Modbus requests to the PLCs instead of the
Transclinics, or …
2. … a Scada software located in the control room sending requests directly to the
Transclinics.
In the case (2), where the Scada sends Modbus requests directly to the Transclinics, the
appropriate RS–485 masters for the field buses are the following Weidmüller Serial/
Ethernet converters, installed in the inverter shelters. Please contact your Weidmüller
sales representative for further information.
1 x RS–485, 0 °C to +60 °C
1242080000 IE-CS-2TX-1RS232/485
1 x RS–485, –40 °C to +75 °C 1285830000 IE-CST-2TX-1RS232/485
2 x RS–485, 0 °C to +60 °C
1242090000 IE-CS-2TX-2RS232/485
2 x RS–485, –40 °C to +75 °C 1285840000 IE-CST-2TX-2RS232/485
CAUTION
Weidmüller’s Serial/Ethernet converters internally tie the RS–485 pin
C to their power supply GND. Failure to observe this particularity could
permanently destroy the RS–485 transceiver ICs and this damage would
not be covered by Weidmüller’s warranty. Please ensure there are no
ground loops (i.e. different paths to protective earth) in the RS–485 bus’
pin C.
Weidmüller also offers PV communication boxes that include all the components needed
to wire, in one single cabinet, RS–485 field buses, PV inverters, weather stations, etc.
creating a redundant, optical Ethernet ring network. These solutions are certified to
work trouble-free with the Transclinics in the field saving you all the grounding and
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