This remote panel monitoring system was designed to allow users
to remotely monitor and log data from remote facilities via dial
up modem connection. This system allows for monitoring of up to
six different interrelated refrigeration units on one modem connection.
This system allows monitoring and control of several system statuses
and supports a history logging of several different temperature
values for trending purposes.
A Visual Basic application was written to provide the user interface.
A connection is established in Visual Basic by calling KEPServerEx
OPC, which establishes communication to the PLC via modem or serial
port. Once a connection is established monitoring of temperatures
and other system variables is possible. It is also possible to
download history logging from the PLC and view this information
as a graph or in a spreadsheet. Various controls are also available;
such as clearing alarms and changing refrigeration settings.