瑞昌明盛进出口贸易有限公司长期供应PLC、DCS系统备件 模块
【主营产品】：
Allen-Bradley(美国AB)系列产品》
ABB(ABB)系列产品》
Invensys Foxboro（福克斯波罗）
Schneider(施耐德电气)系列产品》
General electric(通用电气)系列产品》
Westinghouse（美国西屋）系列产品》
SIEMENS(西门子系列产品)》
销售ABB Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、
Mitsubishi Robots、OTC Robots、Panasonic Robots、MOTOMAN
Robots。
Westinghouse（西屋）： OVATION系统、WDPF系统、MAX1000系统备件。
Invensys Foxboro（福克斯波罗）：I/A Series系统，FBM（现场输入/输出模块）
顺序控制、梯形 逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。
Invensys Triconex: 冗余容错控制系统、基于三重模件冗余（TMR）结构的zui现代化的容错控制器。
Siemens(西门子)：Siemens MOORE， Siemens Simatic C1，Siemens数控系统等。
Bosch Rexroth（博世力士乐）：Indramat，I/O模块,PLC控制器,驱动模块等。
Motorola（摩托罗拉）：MVME 162、MVME 167、MVME1772、MVME177等系列。
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In terms of database:
DCS generally provides a unified database. In DCS system, once a data exists in the database, it can be referenced in any case. The database of PLC system is usually not unified. Configuration software, monitoring software and even filing software have their own database
. In terms of time scheduling:
Generally, the program of PLC cannot run according to the preset cycle. PLC program is executed from beginning to end and then from the beginning（ Now some new PLCs have been improved, but the number of task cycles is still limited.
DCs can set the task cycle. For example, fast task, the same is sensor sampling. The change time of pressure sensor is very short, and it can use 200ms task cycle for sampling, while the lag time of temperature sensor is very large, and it can use 2S task cycle for sampling. In this way, DCs can reasonably schedule the resources of the controller.
In terms of network structure:
Generally speaking, DCS usually uses two-tier network structure, one is process level network. Most DCS use their own bus protocols, which are based on standard Huai serial port transmission protocol RS232 or RS485. The second layer is the operation level network, which adopts the network standard of moderate data throughput, fast transmission speed and convenient connection. Because the operation level network is generally arranged in the control room, the requirement of anti-interference is relatively low, and Ethernet is the best choice.
The task of PLC is relatively simple, the amount of data to be transmitted is generally not too large, so the common PLC system is a layer of network structure. Either the process level network and the operation level network are combined together, or the process level network is simplified as the internal connection between modules, and PLC will not or rarely use Ethernet. In terms of application objects:
PLC is generally used in small automatic control places, such as equipment control or a small amount of analog control and interlocking, while large-scale applications are generally DCS. Of course, this concept is not very accurate, but it&＃39;s very intuitive. It&＃39;s customary to call a system larger than 600 points as DCS and a system smaller than 600 points as PLC.
