of controller were implemented in this work, one is an
embedded main controller with powerful microprocessor
used for human operation (fig. 9), and the other is device
controller with simple and low cost microprocessor used
for control or monitoring home appliances (fig. 11).
IT700 PIM
Host
Interface
Data Link
Layer (MAC)
Line Filter & Coupling
Circuit
PHY
UART
G
P
I
O
AC Powerline
3
LEDs
LCD Display
with Touch
Screen
Host Controller
G
P
I
O
App lic ation
Communication
IF
UART
Ethernet
LAN /
Internet
Fig. 9 Main PLC Controller
The main PLC controller is equipment with a touch
screen LCD display and is realized using a Mini2440
single-board computer from Friendly ARM (fig. 10) [18].
This board is based on the Samsung S3C2440
microprocessor, which
features a 16/32-bit RISC
ARM920T core, includes the following components:
separate 16 KB instruction and 16 KB data cache, MMU to
handle virtual memory management, LCD controller and
touch screen interface, NAND flash boot loader, UART,
DMA, timers with PWM, RTC, 10-bit ADC, camera
interface, AC97 audio codec interface, SPI, IIC-BUS, IIS-
BUS, USB host/device, and SD card interface.
This board utilizes all features of S3C2440
microprocessor and has an Ethernet interface for
LAN/Internet access. The board runs under Linux 2.6.29
or WinCE.NET 5.0 operating system, which makes the
implementation of application software easier and quickly.
In this work the WinCE OS were be selected, which is
supported by Microsoft’s Visual Studio 2008 on window
machine. An Internet web page was developed also for
remote user to access the PLC home network.
Fig. 10 Mini2440 single-board computer [18]
The device PLC controller may equipment with
electronic switch circuits or various sensors but without
Ethernet interface, since all data communications are pass
through the power-line. The electronic switch circuit
(SSR) will be used for control home appliances, such as
lighting, heater, fan and etc. Varity sensors can be used to
detect status of home devices or to monitor environmental
data such as temperature and humidity. The
microprocessor used in the host controller can be any type
with some GPIO ports and UART interface to be
connected to IT700 PIM.
Fig. 11 Device PLC Controller
IV. EXPERIMENT RESULTS
This section will describe experiment results of the
above realizations of home PLC controller. The test
system consists of a main PLC controller and several
device PLC controllers (fig. 12). User can touch the LCD
screen on the main controller and select the button to
switch the corresponded device on or off or adjust the
lighting brightness (fig. 13).
Fig. 12 General home PLC control system
Figure 13a is a user’s interface on the main PLC
controller, after the room is selected, the lower part of the
screen will show all home electrical devices in this room,
and then the user can check or uncheck the device to be
controlled or the sensor to be monitored. After the “send”
button is touched, the main PLC controller will send the
required commands to those devices or sensors via the
home power-line, and receive response data.
IT700 PIM
Host
Interface
Data Link
Layer (MAC)
Line Filter & Co upling
Circuit
PHY
UART
G
P
I
O
AC Powerline
3
LEDs
Electronic
Switch
(SSR)
Power
Outlet
Sensors
Host Controller
G
P
I
O
Application
Communication
IF
UART
RouterModem
Main PLC
Controller
PC
Internet
Device
PLC
Controller
Device
PLC
Controller
Device
PLC
Controller
Power-Line
GPIO Ports
LCD Interface
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