3BHE020356R0101 GFD212A

【主营产品】prefix = "o" ns = "urn:schemas-microsoft-com:office:office"

主营：世界知名品牌的PLC、DCS系统备件 模块

①Allen-Bradley(美国AB)系列产品》

②Schneider(施耐德电气)系列产品》

③General electric(通用电气)系列产品》

④Westinghouse（美国西屋）系列产品》

⑤SIEMENS(西门子系列产品)》

⑥销售ABB Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、

Mitsubishi Robots、OTC Robots、Panasonic Robots、MOTOMAN

Robots。

⑦estinghouse（西屋）： OVATION系统、WDPF系统、MAX1000系统备件

。

⑧Invensys 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。

⑨Siemens(西门子)：Siemens MOORE， Siemens Simatic C1，Siemens

数控系统等。

⑩Bosch 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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PLC ladder diagram programming language is a kind of programming language developed from relay contact control circuit diagram. The structure of the two languages is very similar, but there are essential differences in the process of program execution. Therefore, as the three basic elements of relay contact control system and ladder diagram, contact, coil and wiring are essentially different.
The "normally open" and "normally closed" contacts of input, output, internal relay and other programming elements used in ladder diagram are essentially the data "bit" status of a memory in PLC. The "normally open" contact in the program directly uses the state of this bit for logic operation“ Normally closed "contacts are processed using the" logical not "state of this bit. The difference between it and relay control circuit is that the contact in ladder diagram can be used infinitely in the program. Unlike physical relay, it is limited by the number of contacts actually installed. At any time, the state of the "normally open" and "normally closed" contacts in the ladder diagram is unique, and it is impossible for them to be "L" at the same time. There is a strict "not" relationship between the "normally open" and "normally closed" contacts.
Although the internal relay, output and other programming elements used in ladder diagram programming use the same name of "coil" as relay control circuit, they are not physical relays. The program controls the output of the above coils only by assigning the status of the data "bit" of a memory in PLC. The data "bit" setting "1" corresponds to the "power on" of the coil; Data "bit" set to "0" corresponds to "power off". Therefore, it differs from the relay control circuit in that if necessary, the "output coil" in the ladder diagram can be assigned multiple times in the program, that is, the so-called "repeating coil" can be used in the ladder diagram. The execution of PLC program strictly follows the sequence of ladder diagram "from top to bottom" and "from left to right". In the same PLC program execution cycle, the output state of executed command cannot be changed (the output state of executed command can only be changed in the next cycle). By effectively using this program execution characteristic of PLC, we can design many special logic different from relay control circuit, such as "edge" signal processing.
The "connection" in the ladder diagram only represents the processing sequence relationship of instructions in PLC ("from top to bottom", "from left to right"), it does not have the actual current as the relay control circuit, so each output coil in the ladder diagram should have its own independent logic control "circuit" (i.e. clear logic control relationship), The "bridge type connection" mode often used in relay control circuit can not be used between different output coils, trying to change the executed command output through the later execution conditions