8通道0-20MA输入接口组件 8AI
8通道0-100MV输入接口组件 8AI
8通道0-5VDC输入接口组件 8AI
8通道0-10VDC输入接口组件 8AI
8通道热电偶/毫伏输入接口组件 8T/C 8通道热热电阻输入接口组件(Platinum) 8RTD
8通道热热电阻输入接口组件(Nickel) 8RTD
8通道热热电阻输入接口组件(Copper) 8RTD 8通道0-20MA输入接口组件 4AI/4AO
8通道脉冲输入接口组件 8PI
16通道电压监视输入接口组件 16DI
16通道24VDC触点输入接口组件 16DI
16通道48VDC触点输入接口组件 16DI
输出回读冗余8通道0-20MA输入/输出接口组件 冗余4AI/4AO
16通道0-20MA输入接口组件 16AI
14通道热电偶输入接口组件 14T/C
8通道HART通讯输入接口组件 8HART输入
8通道HART通讯输出接口组件 8HART输出
冗余8通道0-20MA/HART通讯输入接口组件 冗余8AI/HART输入
32通道离散量输入接口组件 32DI
冗余8通道0-20MA/HART通讯输出接口组件 冗余8AI/HART输出
24通道电压监视输入,8通道离散量输出接口组件 24DI/8DO
2通道PROFIBUS-DP现场总线接口组件 2DP宿主机
4段Foundation Fieldbus现场总线接口组件 4H1
在软件方面:
PLC的工作方式为扫描加中断,这既可保证它能有序地工作,避免继电控制系统常出现的"冒险竞争",其控制结果总是确定的;而且又能应急处理急于处理的控制,保证了PLC对应急情况的及时响应,使PLC能可靠地工作。
为监控PLC运行程序是否正常,PLC系统都设置了"看门狗"(Watchingdog)监控程序。运行用户程序开始时,先清"看门狗"定时器,并开始计时。当用户程序一个循环运行完了,则查看定时器的计时值。若超时(一般不超过100ms),则报警。严重超时,还可使PLC停止工作。用户可依报警信号采取相应的应急措施。定时器的计时值若不超时,则重复起始的过程,PLC将正常工作。显然,有了这个"看门狗"监控程序,可保证PLC用户程序的正常运行,可避免出现"死循环"而影响其工作的可靠性。
PLC还有很多防止及检测故障的指令,以产生各重要模块工作正常与否的提示信号。可通过编制相应的用户程序,对PLC的工作状况,以及PLC所控制的系统进行监控,以确保其可靠工作。
PLC每次上电后,还都要运行自检程序及对系统进行初始化。这是系统程序配置了的,用户可不干预。出现故障时有相应的出错信号提示。
正是PLC在软、硬件诸方面有强有力的可靠性措施,才确保了PLC具有可靠工作的特点。它的平均无故障时间可达几万小时以上;出了故障平均修复时间也很短,几小时以至于几分钟即可。
曾有人做过为什么要使用PLC的问卷调查。在回答中,多数用户把PLC工作可靠作为选用它的主要原因,即把PLC能可靠工作,作为它的选指标。
4通道串口通讯单卡 4 RS232/422/485端口
4通道串口通讯冗余组件 4 RS232/422/485端口
10/100MB Ethernet通讯单卡 1 10/100M RJ45端口
10/100MB Ethernet通讯冗余单卡 1 10/100M RJ45端口
冗余8通道0-20MA输出接口组件 可选冗余8AO
8通道电压监视输入,8通道离散量输出(外部电源) 8DI/8DO
8通道电压监视输入,8通道离散量输出(内部电源) 8DI/8DO
8通道触点输入,8通道离散量输出(外部电源) 8DI/8DO
8通道触点输入,8通道离散量输出(内部电源) 8DI/8DO
16通道触点输出(外部电源)接口组件(可选冗余) 可选冗余16DO
8通道双向FOXCOM双波特率智能设备接口组件 冗余8通道双向FOXCOM双波特率智能设备接口组件 冗余8IT
随着PLC技术的发展,PLC产品的种类也越来越多。不同型号的PLC,其结构形式、性能、容量、指令系统、编程方式、价格等也各有不同,适用的场合也各有侧重。因此,合理选用PLC,对于提高PLC控制系统的技术经济指标有着重要意义。
PLC的选择主要应从PLC的机型、容量、I/O模块、电源模块、特殊功能模块、通信联网能力等方面加以综合考虑。
PLC机型的选择
PLC机型选择的基本原则是在满足功能要求及保证可靠、维护方便的前提下,力争的性能价格比。选择时主要考虑以下几点:
(一) 合理的结构型式
PLC主要有整体式和模块式两种结构型式。
整体式PLC的每一个I/O点的平均价格比模块式的便宜,且体积相对较小,一般用于系统工艺过程较为固定的小型控制系统中;而模块式PLC的功能扩展灵活方便,在I/O点数、输入点数与输出点数的比例、I/O模块的种类等方面选择余地大,且维修方便,一般于较复杂的控制系统。
(二) 安装方式的选择
PLC系统的安装方式分为集中式、远程I/O式以及多台PLC联网的分布式。
集中式不需要设置驱动远程I/O硬件,系统反应快、成本低;远程I/O式适用于大型系统,系统的装置分布范围很广,远程I/O可以分散安装在现场装置附近,连线短,但需要增设驱动器和远程I/O电源;多台PLC联网的分布式适用于多台设备分别独立控制,又要相互联系的场合,可以选用小型PLC,但必须要附加通讯模块。
(三)相应的功能要求
一般小型(低档)PLC具有逻辑运算、定时、计数等功能,对于只需要开关量控制的设备都可满足。
对于以开关量控制为主,带少量模拟量控制的系统,可选用能带A/D和D/A转换单元,具有加减算术运算、数据传送功能的增强型低档PLC。
对于控制较复杂,要求实现PID运算、闭环控制、通信联网等功能,可视控制规模大小及复杂程度,选用中档或PLC。但是中、PLC价格较贵,一般用于大规模过程控制和集散控制系统等场合。
(四)响应速度要求
PLC是为工业自动化设计的通用控制器,不同档次PLC的响应速度一般都能满足其应用范围内的需要。如果要跨范围使用PLC,或者某些功能或信号有特殊的速度要求时,则应该慎重考虑PLC的响应速度,可选用具有高速I/O处理功能的PLC,或选用具有快速响应模块和中断输入模块的PLC等。
(五)系统可靠性的要求
对于一般系统PLC的可靠性均能满足。对可靠性要求很高的系统,应考虑是否采用冗余系统或热备用系统。
(六)机型尽量统一
一个企业,应尽量做到PLC的机型统一。主要考虑到以下三方面问题:
1)机型统一,其模块可互为备用,便于备品备件的采购和管理。
2)机型统一,其功能和使用方法类似,有利于技术力量的培训和技术水平的提高。
3)机型统一,其外部设备通用,资源可共享,易于联网通信,配上位计算机后易于形成一个多级分布式控制系统。
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APPLIED MATERIALS AMAT 3X2H XR80 HIGH VOLTAGE MODULE 9090-00785ITL
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