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PLC的cpu内有指示程序步存储地址的程序计数器，在程序运行过程中，执行一步该计数器自动加1，程序从起始步（步序号为零）起依次执行到终步（通常为end指令），然后再返回起始步循环运算。PLC每完成一次循环操作所需的时间称为一个扫描周期。不同型号的PLC，循环扫描周期在1微秒到几十微秒之间。程序计数器这样的循环操作，这是DCS所没有的。这也是使PLC的冗余不如DCS的原因。DCS是在运算放大器的基础上得以发展的。把所有的函数和过程变量之间的关系都做成功能块（有的DCS系统称为膨化块）。DCS和PLC的表现的主要差别是在开关量的逻辑解算和模拟量的运算上，即使后来两者相互有些渗透，但是还是有区别。80年代以后，PLC除逻辑运算外，控制回路用的算法功能已经大大，但PLC用梯形图编程，模拟量的运算在编程时不太直观，编程比较麻烦。但在解算逻辑方面，表现出快速的优点，在微秒量级，解算1k逻辑程序不到1毫秒。它把所有的输入都当成开关量来处理，16位（也有32位的）为一个模拟量。而DCS把所有输入都当成模拟量，1位就是开关量。解算一个逻辑是在几百微秒至几毫秒量级。对于PLC解算一个pid运算在几十毫秒，这与DCS的运算时间不相上下。在接地电阻方面，对PLC也许要求不高，但对DCS一定要在几欧姆以下（通常在4欧姆以下）。模拟量隔离也是非常重要的。相同i/o点数的系统，用PLC比用DCS，其成本要低一些（大约能省40%左右）。PLC没有操作站，它用的软件和硬件都是通用的，所以维护成本比DCS要低很多。如果被控对象主要是设备连锁、回路相对很少，采用PLC较为合适。如果主要是模拟量控制、并且函数运算很多，好采用DCS。DCS在控制器、i/o板、通讯网络等的冗余方面，一些***运算、行业的特殊要求方面都要比PLC好得多。PLC由于采用通用监控软件，在设计企业的管理信息系统方面，要容易一些。PLC和DCS系统一般分别适用于离散和过程生产制造。使用PLC系统的离散生产制造设施，一般由单独的生产装置组成，主要用于完成部件的组装，例如打标签、填充或研磨等。过程制造设施，通常使用自动化系统，以连续和批处理的方式按照配方而不是按件生产。大型连续加工设备，如炼油厂和化工厂，都使用DCS自动化系统。混合应用通常同时使用PLC系统和DCS系统。为某个应用选择控制器，需要考虑过程的规模、可扩展性和未来的更新计划、集成需求、功能、高可用性以及工厂设施整个生命周期的投资回报等等诸多因素。
型号：
ABB(S800系列）
英维思(3008, 3625, 3508E. 3721, 3700A 4351B)
本特利(3500/42M， 3500/ 22M, 3500/95.3500/05)
黑马(F3330, F3236, F6217, F7126, F8621A)
福克斯波罗(FBM203, FBM204, FBM217, FMB231)
AB: (1746 1747 1756 1770 1771 1785 触摸屏2711系列CPU PLC) .
普罗索芙特PROSOFT MVI46/56/69, AB旗下，跟AB很像,模块
横河YOKOGAWA AAI, ADV, ADI, ANB, AMM, SB, PW(型号开头),卡件模块(CPU,电源,输出，PLC)
摩尔MOORE Q开头, 3开头模块,显示器
Safety control system is a control system specially used for interlocking and emergency shutdown in dangerous places (such as petrochemical plants). The essential difference between it and DCS and PLC of ordinary process control is that its function is to make the device stop safely under accident and fault conditions (including device accident and control system failure), so as to avoid disaster, that is, to avoid injury to device personnel and impact on the environment. Therefore, the safety control system itself must be fail to safe, The reliability of the hardware and software of the system is very high. In the international safety standard IEC61508, there are detailed provisions on the requirements of safety level and safety control system. T ? V is the only safety control system certification body in the world at present.Since hima first launched the t ? V certified fail safe safety control system hima planar system in 1970, the safety control system has a development history of 30 years.
Development history of hima safety control system:
In 1970, hima launched the world&＃39;s first t ? V certified fail safe control system hima planar system and put it into use.
In 1983, hima launched the world&＃39;s first fail safe programmable electronic control system (PES) for safety control.
In 1986, hima launched the world&＃39;s first programmable safety control system H50 certified by t ? V and put it into use. The CPU structure is double redundant fault-tolerant full self diagnosis type, that is, 1oo2d.
In 1991, hima launched the second generation of t ? V certified PES system h51 and H41 series products
In the late 1980s and early 1990s, other manufacturers of safety control systems emerged one after another, and the technology adopted is generally 1oo2d or 2oo3 voting (TMR) technology, which is still used today.
In 1997, hima launched the world&＃39;s first A-type system product with quad (QMR) CPU structure certified by t ? V, namely 2oo4d.
In 1998, hima launched the third generation of t ? V certified PES systems h41q and H51q, which adopt Quad CPU structure, namely 2oo4d. CPU structure of programmable (PES) safety control systemAt present, the programmable safety control system that conforms to iec-61508 standard and has obtained t ? V ak6/sil3 level certification in the world has the following three mainstream CPU structures:
Double redundant fault-tolerant complete self diagnostic structure, i.e. 1oo2d structure.
power cards (f7130a)
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