Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 29
Typical Application
The following figure illustrates a typical Modbus Adapter application for a motor control
center (MCC). In this application, the motor control (cover control units) is located on
CHA.
This application has many devices (not shown) on Modbus, and the Modbus Adapter is a
single node on that network. The Modbus Adapter presents the QCPort devices on CHA
and CHB as registers on Modbus so the controller can monitor and control the IO and
motor control connected to the Modbus Adapter. In an effort to simplify the graphic, the
power supply and terminating resistor are not shown in this example.
Table 25: Typical Modbus Adapter (D77D-EMA) Application
Due to the way the Modbus registers are created, each devices’ data (IO) parameters are
located in a unique register. For a device that has multiple parameters, each parameter
will be located in a register that is adjacent to the next parameter. An example will be
given in a later section.
Modbus TCP
or
Serial Modbus
QCPort
