This paper presents one of the most accurate, stable and fast to response advanced control system (PROPORTIONAL INTEGRAL DIFFERENTIAL CONTROL SYSTEM), which considered one of the special cases of closed loop control systems. Also, display and compare
different forms of control and response of sub modes of PID controller, through using programmable logical controller and programmed it to be (PID) controller, and take advantage of this system for accurate control of the three phase motor speed. In addition, the PLC program is been connected to monitoring and collecting data software, known by acronym (SCADA) for calibration of (PID) and use this software to display the result of the responses for the different types of the controller PID in the form of graphic curves. These response curves show accuracy and fast to response that make this application an integrated system that could be form the infrastructure of many practical applications like large cranes, overlapping product lines and different other applications and the use of PLC systems make them high quality and high reliability systems.
The weigh feeders constitute an essential part of any production facility, where its
control and supervision system is one of the important things that should be characterized
by precision and reliability.
From this research we will try to develop
the unreliable control and supervision
system of the weigh feeders in mills of raw materials department in Tartous cement and
building materials company. The work Will focus on trying to avoid errors and problems
that the old control system suffered in order to reach the best possible performance of
weigh feeders, facilitate maintenance process and reveal the problems as they happen by
proposing controlled weigh feeders by programmable logical controllers from SIEMENS
corporation with processor (CPU 315-2 PN / DP), and design supervision and collection
data system using software (WINCC Flexible sp3 2008).
We'll apply the steps of the study practical on the weigh feeder of mill of raw
materials, and we will conduct the necessary tests to ensure the validity and accuracy of the
new control system, therefore the range of reliability.
In this essay we will study the using of OPC standard in adapting and removing the
incompatibility between different components and devices in the control system . The OPC
works as a third party that connect between devices (data sources) and progr
ams that
require this data , in case those programs may can't connect directly with that devices as a
result of incompatibility between them. This incompatibility happens because these
devices and programs are from different vendors or because the devices are very old and
can't connect with newer programs. OPC will be a suitable solution for communications
problems between the devices and programs in the control system, the OPC will connect to
each of them and transfer data as good as if the connection between them is direct without
any third party.
The importance of this suggested technique will be shown practically in this essay
through the implementation of it in solving one of the pumping control system problems in
the Syrian Company for Oil Transport (SCOT). the suggestion was to use a OPC Server
program (Kepware OPC Server) and a SCADA program ( WinCC flexible) instead of the
old SCADA program and keep the old PLC devices , in this way we can get rid of the
problems that appear in the old SCADA program and therefore we can ensure that the
system will work as wanted with no problem. That will bring benefits to the company and
results to high reliability in the work.
