1756-OF8
1756-OF8 8路输出模块1756-OF8
选型规则编辑
控制器 1756-L55M13
1756-OF8 8路输出模块1756-OF8
1756-OF8 8路输出模块1756-OF8
BANNER ENGINEERING D5BN05 PHOTOELECTRIC
1756-OF8 8路输出模块1756-OF8
1756-OF8 8路输出模块1756-OF8
在可编程逻辑控制器系统设计时,首先应确定控制方案,下一步工作就是可编程逻辑控制器工程设计选型。工艺流程的特点和应用要求是设计选型的主要依据。可编程逻辑控制器及有关设备应是集成的、标准的,按照易于与工业控制系统形成一个整体,易于扩充其功能的原则选型所选用可编程逻辑控制器应是在相关工业领域有投运业绩、成熟可靠的系统,可编程逻辑控制器的系统硬件、软件配置及功能应与装置规模和控制要求相适应。熟悉可编程序控制器、功能表图及有关的编程语言有利于缩短编程时间,因此,工程设计选型和估算时,应详细分析工艺过程的特点、控制要求,明确控制任务和范围确定所需的操作和动作,然后根据控制要求,估算输入输出点数、所需存储器容量、确定可编程逻辑控制器的功能、外部设备特性等,最后选择有较高性能价格比的可编程逻辑控制器和设计相应的控制系统。
一、输入输出(I/O)点数的估算
I/O点数估算时应考虑适当的余量,通常根据统计的输入输出点数,再增加10%~20%的可扩展余量后,作为输入输出点数估算数据。实际订货时,还需根据制造厂商可编程逻辑控制器的产品特点,对输入输出点数进行圆整。
二、存储器容量的估算
存储器容量是可编程序控制器本身能提供的硬件存储单元大小,程序容量是存储器中用户应用项目使用的存储单元的大小,因此程序容量小于存储器容量。设计阶段,由于用户应用程序还未编制,因此,程序容量在设计阶段是未知的,需在程序调试之后才知道。为了设计选型时能对程序容量有一定估算,通常采用存储器容量的估算来替代。
存储器内存容量的估算没有固定的公式,许多文献资料中给出了不同公式,大体上都是按数字量I/O点数的10~15倍,加上模拟I/O点数的100倍,以此数为内存的总字数(16位为一个字),另外再按此数的25%考虑余量。
三、控制功能的选择
该选择包括运算功能、控制功能、通信功能、编程功能、诊断功能和处理速度等特性的选择。
1、运算功能
简单可编程逻辑控制器的运算功能包括逻辑运算、计时和计数功能;普通可编程逻辑控制器的运算功能还包括数据移位、比较等运算功能;较复杂运算功能有代数运算、数据传送等;大型可编程逻辑控制器中还有模拟量的PID运算和其他高级运算功能。随着开放系统的出现,在可编程逻辑控制器中都已具有通信功能,有些产品具有与下位机的通信,有些产品具有与同位机或上位机的通信,有些产品还具有与工厂或企业网进行数据通信的功能。设计选型时应从实际应用的要求出发,合理选用所需的运算功能。大多数应用场合,只需要逻辑运算和计时计数功能,有些应用需要数据传送和比较,当用于模拟量检测和控制时,才使用代数运算,数值转换和PID运算等。要显示数据时需要译码和编码等运算。
2、控制功能
控制功能包括PID控制运算、前馈补偿控制运算、比值控制运算等,应根据控制要求确定。可编程逻辑控制器主要用于顺序逻辑控制,因此,大多数场合常采用单回路或多回路控制器解决模拟量的控制,有时也采用专用的智能输入输出单元完成所需的控制功能,提高可编程逻辑控制器的处理速度和节省存储器容量。例如采用PID控制单元、高速计数器、带速度补偿的模拟单元、ASC码转换单元等。
模块 1756-CNB/D
模块 1756-CNB/D
模块 1756-CNB/D
模块 1756-CNB/D
1764-LSP
1769-IF8
1769-ECR
1761-CBL-PM02
1746-HSCE2
1761-L20BWB-5A
1756-L55
1756-IM16I
1794-OB16
1794-IC16
1794-ACNR15。
1784-PCMK/B
150-C25NBD
1747-L552
1746-OB32
1746-IB32
1786-TPS
1746-NO4I
1746-NO4V
1784-PCM5
1747-N2
22B-D2P3N104
1771-OMD
1771-OAD
1747-L542
1746-P2
1746-A7
1746-IB16
1746-OB16
1746-NI4
1746-OW16
1746-IM16
1746-OW16
1746-NI8
1746-IB16
1746-OW16I
1756-CNB
1756-IF16
1756-IB16
2711-K6C20
22C-D045A103
1771-IBN
1786-RPFM/A
1786-RPA/B
1756-OF8
1756-IF8
1756-BA2
1756-BA11756-BA11756-BA11756-BA11756-BA1
1784-CF64
1756-L61
1747-L551
1746-P4
1746-NI16I
1746-NO8I
1746-IB32
1746-OW16
1746-A10
1746-NO4I
1747-L553
1746-NI8
1746-OB32
1746-P4
1746-IB32
1746-A13
1747-SDN
2090-XXNPMP-16S15
2094-PRS6
2094-PRS7
1786-RG6
1784-PKTX
800FM-JR2
800FM-JR4
2208E/CC/VH/LH/XX/FH/XX/XX/2FE/ENG
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