Integration With A Modbus Rtu Client - Weidmuller Transclinic 16i+ User Manual

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.
sales representative for further information.
CAUTION
Some Serial/Ethernet converters internally tie the RS–485 pin C to their
power supply GND.
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.
Failure to observe this particularity could permanently
Please contact your Weidmüller
73