The difference between DCS and PLC

Key points of difference between DCS and PLC newmaker welcome to e hall exhibition hall 3 PLC PLC programmable controller, PLC programming cable. 。 。 1. DCS is a kind of distributed control system, and the PLC ( Programmable controller) Just a kind of control 'devices', both are the difference between the 'system' and 'devices'. System can implement any device function and coordination, PLC device can realize the function of this unit has only. 2. In terms of network, DCS network is the whole of the central nervous system, it is safe and reliable double redundant high-speed communication networks, better expansibility and openness of the system. And PLC because basically all work for the individual, its with other PLC or PC communication, network form basic is adopted by the single network structure, network protocols are often not in conformity with international standards. On the network security, PLC is not very good protection. We use the power, the CPU, network, double redundancy. 3. DCS overall consideration scheme, has function of engineer station operator station, running between station and station plan program is a joint partnership after bottoms, any station, any function between any charged device, is a mutual chain control, control and coordination; And use PLC consisting of interconnected system, the station and station ( PLC and PLC) The link between is a loose connection, do not the function of coordinated control. 4. DCS in the entire history of the design will have a lot of extensibility interface, external systems or extended system is very convenient, PLC controller the lap, after the completion of the entire system to arbitrary increase or decrease the operator station is difficult to achieve. 5. DCS safety: to ensure safe and reliable, DCS control device DCS adopted double redundancy control unit, when important control unit fails, redundant unit associated real-time undisturbed switching as the unit of work, ensure the safety of the system is reliable. PLC system almost no overlap by the concept of redundancy, is much less redundant control strategy. Especially when its a PLC unit failure occurs, will have to stop the whole system, can be replaced to preserve and need to be reprogrammed. So the DCS system to a level higher than on its safety and reliability. 6. System software, for a variety of process control plan update is a function of DCS is one of the most basic, when a plan change, engineers need only the engineer station will be changed after the compilation, bottoms command, bottoms process is done by the system automatically, do not affect the original control scheme. System control software and algorithm process control object control precision can be improved. For in the composition of PLC system, very large workload, you first need to determine which is to edit update by PLC, and then to use the program compiled with the matching compiler, final reoccupy dedicated machine ( Reading and writing) Special one-on-one to send the PLC program, during the system debugging, a huge increase in debugging time and test cost, and extremely detrimental to the future maintenance. On the control accuracy. This determines the why in large and medium-sized control project ( More than 500 points) , do not use all basic by PLC connected with the cause of the system. 7. Module: all I/O module with DCS system CPU, can realize the acquisition and output signal quality judgement and scalar transform, the fault charged plug, random replacement. And electric conversion unit, PLC module is simply not smart chip, corresponding unit completely paralyzed after failure. 8. Now the function of PLC and DCS has is the same as the high-end, DCS to network and distributed database regularly scan has strong function, at the same time of operation and the analog quantity is good. 9. PLC has large, medium and small, micro PLC, one of the tiny only sell several hundred yuan to 2000 yuan, points or less, big can take thousands of points, computing power and DCS, but for multimachine networking function is weak. Now two technology platform about the same, just focus is different.
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