METSO IOP331 Digital Input Module Card

METSO IOP331 Digital Input Module Card

DCS control system and PLC control system difference:

   DCS is a "decentralised control system", and PLC (programmable controller) is only a control "device", the two are the "system" and The difference between the two is "system" and "device". The system can achieve any device function and coordination, PLC device only to achieve the unit has the function.

   DCS network is the nerve of the whole system, DCS system is usually used ** standard protocol TCP / IP, it is safe and reliable double redundant high-speed communication network, system expansion and openness is better. And PLC because basically for a single small system work, in communication with other PLC or host computer, the network form is basically a single network structure, network protocols are often inconsistent with the ** standard.

  DCS overall consideration of the programme, the operator station are equipped with engineers station function, station and station in the operation programme program installed after a close joint relationship, any station, any function, any controlled device are chained to each other control, coordinated control; and a single PLC connected to each other to form a system, the station and station (PLC and PLC) is a loose connection between the connection between the way to do out of the Coordinated control function.

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