No.111 Huoju South Road, Mianyang High-Tech Industries Area, Sichuan, P.R. China
0086-816-2533419, 2548936
Marketing competition forces modern enterprise to expand
production-scale for economies of scale. This trend stimulate the
demand of automation. With the development of environment care and product quality, the
production scale of the modern enterprise becoming bigger and
bigger, it is higher requirements for automation. In order to
expand production scale, strengthen production management, increase
quality of product, reduce production cost, more and more
enterprises like to adopt automated control system. The control core of the DCS developed by FOREVER is a new
controller based on field bus-mastering. The retractility of size
of control system composed of controller is strong, changing
arbitrarily from few points to thousands of points. The controllers
can be linked by net easy and compose the automated control system
of whole enterprise, realizing the produce information shared. Relying on the abundant experience in chemical produce technique
and engineering, our DCS developed on chemical devices succeed in
using on many chemical iterms. More details DCS often consists of: Process Controller. I/O unit. Operation station &
Engineer station. Communication network. software.. Process Controller Process controller is the core part of the automatic control
system. Its main functions are: Process and calculate
different the various signals. Calculate and carry out
all control algorithms. Calculate and carry out
logic functions. Network functions. Alarm message handling. Historical data storage
& display etc. To carry out all these functions, it must be combined with
corresponding platform configuration software. Through this
platform software the control functions, network, alarms, history
data, etc., will be handled, configured and downloaded in the
Process Controller Then the Process Controller can start its
work. The basic requirements for the Controller are: Sufficiently powerful
functionality Reliable electrical and
mechanical performance. Open communication
system. Attractive price. Functionality Necessary function in the Process Controller Logic interlocks Alarm and monitor functions Complex control algorithms Analog calculations On-off data calculation Trends, reports & statistical
functions Process controller such as AC800F series from ABB and S7-400、S7-300
series from SIEMENS are most frequently used in DCS system.. I/O unit: Instruments transmit 4-20mA or 0-10V analog signals, and the actuator receives such analog signals. The Process Controller can only recognize and handle digital encoded signals, of binary code so signal input and output of the instrument and electrical equipment need a correspond I/O unit. The main function of the I/O unit is to convert the input signal from instrument and motors on site to digital numbers that can be recognized by Process Controller. At the same time it must convert the digital numbers processed to the correspond electrical signal and then output this to the control actuators and motors on site . The I/O unit must be equipped with sufficient and reliable
electrical and mechanical performance in order to work in different
conditions and environments. Environments such as strong
electromagnetic disturbances, high humidity & dusty
environment, vibration etc. It must have such functions as self
diagnostics, power handling when power goes off and on, redundancy
etc. ABB S800 series and SIEMENS S7-300 series are most frequently used
in DCS system I/O units. Operator Station and Engineering Work Station: The Operator Station is a PC which is used for operation control,
monitoring, alarms, trend displays and reporting. The operator
station handles the above functions with internal software, and
connects to Process Controller through the communication network. Engineer station is a computer, which is used for process control
software configuration; diagnosis; and to monitor the operation of
the process control station. It is also used by the DCS maintenance
engineer for configuration, testing, and DCS system maintenance. In
a small application the operator station is often also serving as
an engineer work station. Communication network: The communication net work structure of DCS is two layers: Process level Operation level. Proces |
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