TC520 3BSE001449R1 安装与运输
Analog quantities, such as current, voltage, temperature, pressure, etc., are continuously changing in size. Indust…
Analog quantities, such as current, voltage, temperature, pressure, etc., are continuously changing in size. Indust…
PLC is mainly used for logic control of switching quantity. With the advancement of PLC technology, its application…
PLC在国内外已广泛应用于钢铁、石油、化工、电力、建材、机械制造、汽车、轻纺、交通运输、环保及文化娱乐等各个行业,使用情况主要分为如下几类: 开关量逻辑控制 取代传统的继电器电路,实现逻辑控制、顺序控制,既可用于单台设…
Definition: A programmable controller is an electronic system that operates digitally, designed for use in industri…
PM511V16 3BSE011181R1 控制模块 ABB DCs has an extremely important position in the field of continuous control. So far, …
RF522 3BSE000743R1 ABB 专用化工、造纸印刷、纺织印染The main features of dcs. dcs has the following main characteristics: separati…
DSRF197 3BSE019297R1 ABB(框架) DCS is the abbreviation of distributed control system, also known as distributed contr…
DSAO120A 3BSE018293R1 量规格表 The unit type is characterized by a compact structure. It packs all the circuits into a …
软件措施: 有极强的自检及保护功能。 ①故障检测——软件定期地检测外界环境,如掉电、欠电压、锂电池电压过低及强干扰信号等。以便及时进行处理。 ②信息保护与恢复——当偶发性故障条件出现时,不破坏PLC内部的信息。一旦…
硬件措施: 主要模块均采用大规模或超大规模集成电路,大量开关动作由无触点的电子存储器完成,I/O系统设计有完善的通道保护和信号调理电路。 ①屏蔽——对电源变压器、CPU、编程器等主要部件,采用导电、导磁良好的材料进行屏…
为适应工业环境使用,与一般控制装置相比较,PLC机有以下特点: 可靠性高,抗干扰能力强 工业生产对控制设备的可靠性要求: ①平均故障间隔时间长 ②故障修复时间(平均修复时间)短 任何电子设备产生的故障,通常…
为了提高PLC控制系统工作的可靠性,可以专门设置一个定时器,作为监控程序部分,对系统的运行状态进行检测。若程序运行能正常结束,则该定时器就立即被清零;若程序运行发生故障,如出现死循环等,该定时器在设定的时间到就无法清零,此时P…