IS215UCVEH2A
IS215UCVEH2A
IS215UCVEH2A
program after installation is a close association between any station, any function, any controlled device is interlocking control, coordination control; And the single use of PLC connected with each other constitute the system, the station and station (PLC and PLC) between the connection is a loose connection, is not a coordinated control function.
4. DCS in the whole design has a large number of extensible interface, external system or extension system is very convenient, PLC lapped after the completion of the whole system, want to arbitrarily increase or reduce operator station is difficult to achieve.
5. DCS security: in order to ensure the safety and reliability of the DCS control equipment, DCS uses a double redundant control unit, when the important control unit failure, there will be related to the redundancy unit real-time no interference switch to the work unit, to ensure the safety and reliability of the whole system. The PLC lapped system basically does not have the concept of redundancy, let alone redundant control strategy.
Especially when a PLC unit failure, have to stop the whole system, can be replaced and maintenance and need to be reprogrammed. So the DCS system than its safety and reliability on a higher level.
6. System software, the various process control scheme update is one of the most basic functions of DCS, when a scheme changes, the engineer only need to change the scheme compiled in the engineer station, execute the lower command can, the lower process is automatically completed by the system, does not affect the original control scheme operation. All kinds of control software and algorithms can improve the control precision of process control object. 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\
