Detailed contrast analysis - PLC and DCS

cannot compare PLC and DCS, PLC is the controller, is a product of isolation, and DCS system. But the PLC can be compared with DCS control station, the PLC cycle in about 10 milliseconds, and DCS control station at around 500 milliseconds, the openness of the PLC is better, as its ability to work independently and stronger products.

DCS is a system, including superior software, network and controller and PLC is a controller, to constitute a system also need power SCADA system and connected to the network.

DCS is a kind of distributed control system, hardware including on-site controller, the operator station computer, engineer station computer, and contact their network system; DCS software is an overall plan, all is a system to solve the technical problems, system combined with strict between the parts.

PLC is a device that hardware is equivalent to the field controller in DCS; Software is a local solution, loosely organized between station and station.

analysis the difference between DCS and PLC, the key is two points, one is the DCS is distributed control, has a global database; Second, the PLC controller is a sequential scan mechanism, control of DCS is as a benchmark. Our system is in line with the first point, such as an I/O label changes, the HMI can also be synchronized.

PLC: from the sequential control switch quantity control development, transport processing, from down to up continuous multifunction such as PID control, PID in the relay station. Can use a PC as the main station, with more than one type of PLC is from the station. Can also be a PLC controller station is given priority to, with more than one type of PLC is from the station, a PLC network. This place is convenient than using PC as master station: a user programming, don't need to know the communication protocols, as long as according to the instruction format just write. PLC controller grid can be used as independent DCS, and can be used as a subsystem of DCS. PLC is mainly used in the order of the industrial process control, a new type of PLC are both closed loop control function.

DCS: distributed control system DCS set 4 c ( 通信、计算机、控制、CRT) The technology of monitoring technology. From the top to the bottom of the tree topology big system, including communication ( Communication） Is the key. PID in relay station, relay station connecting computer and field instrumentation and control device is a tree topology and the link structure of parallel continuous, also have a large number of cable from JiZhan parallel to the field instruments. Analog signal, A/D - D/A, with A mixture of microprocessors. A meter a line from the I/O, by a control station on a LAN LAN. DCS is a control ( The engineer station) , operation ( The operator station) , field instruments ( On-site observation) Level 3 structure. For large-scale continuous process control, such as petrochemical, etc.

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