The 2500 system uses a flexible modular „building block“ concept of almost infinite flexibility to bridge the gap between accurate local analogue control systems – usually based on discrete PID controllers – and more complex digital process control architectures which use networked PLCs and industrial computers.
The 2500 system incorporates a number of special hardware and software interactions and will provide very fast, accurate response times for analogue process control systems. The concept combines accurate, reliable PID process control functions with communications capability, plus very flexible system design, configuration and operation. The 2500 system will pro-vide both OEMs and plant operators with powerful local analogue control capabilities.
Main components
The 2500 is actually a high-performance dual PID controller with adaptive tuning, cascade and gain scheduling, together with mathematical functions and combinational logic. It is mounted on a DIN rail base, which it shares with a number of plug-in I/O modules. The most basic form which the system can take consists of a flexible I/O section positioned on or adjacent to the controlled process or machine. This will normally be linked to a separate „strategy engine“ sited either nearby or at a remote location.
The strategy engine, which in most cases will be the manufacturer’s T2900 controller, sets and checks process information and overall system parameters remotely. The T2900 is a multi-setpoint programmer and data logger featuring an interactive (touch screen) display. The clear, unambiguous displays of process parameters will reduce operator error and allow early identification of process problems.
For original equipment manufacturers and independent integrators, the 2500 can also stand alone or run alongside any Modbus RTU or Profibus DP master – in a Scada package including a Soft PLC, or with a large PLC – to provide secure independent analogue control. This concept will be of particular interest to OEMS, who because of system modularity will be able to configure the elements to meet the needs of specific processes or equipment quickly and economically.
Because of its nature, the 2500 system will be particularly suited to control of complex temperature profile applications, such as conveyor ovens, conveyor furnaces, kilns, packaging lines, environmental chambers and similar processes. However, while temperature control is seen as the main application area, the system will also effectively measure and control any process variable such as weight, pressure, flow rate or level. Because the system uses compact data-acquisition and control elements mounted on or near to the controlled machine or process, with only a communications cable to the user interface, there is no need for separate control cubicles.
Configuration
Initial configuration (system set-up) is achieved using a personal computer running iTools, a Windows-based configuration tool. This software provides a Windows Explorer network view, with various on-screen tool utilities which allow each system to be fully configured and commissioned, including the setting up of soft user wiring. This versatile facility gives the commissioning engineer or plant operator the ability to specify not just operational parameters but also the way in which information is presented and used on screen.
Advantages of the concept
Most flow-type processes require fast ana-logue control to efficiently handle changes in temperature, pressure, flow and other process variables. This is notoriously difficult using digital techniques. The 2500 allows this to be done within the framework of overall computer or PLC control, without losing accuracy or speed. Users will also see improvements in cost and functionality, because the modular concept will allow systems to be tailored exactly to the application without built-in redundancy, excessive cabling or unnecessary hardware.
The 2500 is built and tested to ISO9000 standards. The product meets all relevant national and international safety and performance specifications – including UL, CSA, EN and European EMC directives.
Eurotherm Regler
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Further information cpp-292
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