ABB SS822 3BSC610042R1
特殊辅助继电器
辅助继电器中M8000~M8255共256点为特殊辅助继电器,它们用来表示PLC的某些状态,提供时钟脉冲和标志(如进位、借位标志),设定PLC的运行方式,或用于步进顺控、禁止中断、设定计数器是加计数器或是减计数器等。特殊辅助继电器可分为以下两类:
(1)触点利用型
由PLC的系统程序来驱动特殊辅助继电器的线圈,在用户程序中直接使用其触点,但是不能出现它们的线圈,例如:
M8000(运行监视):当PLC执行用户程序时M8000为ON,停止执行时M8000为OFF,如图所示。
M8002(初始化脉冲):M8002仅在M8000由OFF变为ON状态时的一个扫描周期内为ON,如图6.10所示,可以用M8002的常开触点来使有断电保护功能的元件复位或给它们置初始值。

图时序图
M8011~M8014分别是10ms、100ms、1s和1min时钟脉冲,见图6.10。
M8005(锂电池电压降低时用):电池电压下降至规定值时变为ON,可以用它的触点驱动输出继电器和外部指示灯,从而提醒工作人员更换锂电池。
(2)线圈驱动型
由用户程序驱动其线圈,从而使PLC执行特定的操作,因此用户并不使用它们的触点。例如:
M8030的线圈“通电”后,“电池电压降低”发光二极管熄灭;
M8033的线圈“通电”后,PLC进入STOP状态后,所有输出继电器的状态保持不变;
M8034的线圈“通电”后,禁止所有的输出;
M8039的线圈“通电”后,PLC以D8039中指定的扫描时间工作。
4、状态继电器(S)
状态继电器是用于编制顺序控制程序的一种编程元件(状态标志),常与STL指令(步进梯形指令)配合使用,主要用于编程过程中顺控状态的描述和初始化。它与STL指令组合使用,容易编制出易懂的顺控程序。当不对状态继电器使用步进梯形指令时,可以把它们当作普通辅助继电器(M)使用,其地址码按十进制编码。FX2N系列PLC的状态继电器通常分为以下几类:
初始化用:S0~S9(10点);
返回原点状态器:S10~S19(10点);
通用型:S20~S499(480点);
断电保持型:S500~S899(400点);
报警型:S900~S999(100点)。
5、定时器(T)与计数器(C)
FX1N、FX2N系列PLC内部可提供256个定时器和256个计数器,定时器的编号为T000~T255,计数器的编号为C000~C255。定时器和计数器不能直接产生输出,必须通过输出继电器才能输出。
1.定时器(T)
定时器在PLC中的作用相当于一个时间继电器,PLC内的定时器是根据时钟脉冲的累积形式,将PLC内的1ms、10ms、100ms等时钟脉冲进行加法计数,当所计时间达到规定的设定值时,其输出触点动作,定时范围为0.001~3276.7s。定时器可以用用户程序存储器内的常数K作为设定值,也可以用数据寄存器(D)的内容作为设定值。定时器的元件号及其设定值如下:
(1)100ms定时器T0~T199,共200点,计时范围:0.1~3276.7秒;
(2)10ms定时器T200~T245,共46点,计时范围:0.01~327.67秒;
(3)1ms积算定时器T246~T249,共4点,计时范围:0.001~32.767秒;
(4)100ms积算定时器T250~T255,共6点,计时范围:0.1~3276.7秒。
定时器的定时值=设定值×时钟,定时器指令符号和时序图如下图所示。

在上图中,当定时器线圈T0的驱动输入X0接通时,T0的当前值计数器对100ms的时钟脉冲每隔100ms加1,当该值与设定值K100相等时,定时器的输出触点动作,即输出触点是在驱动线圈后的10秒(100×100ms=10s)时才动作,T0的常开触点闭合后,Y0就有输出。当驱动输入X0断开或发生停电时,定时器就复位,输出触点也复位。
在FX1N、FX2N系列PLC中,积算定时器一共有10点,1ms积算定时器有4点,从T246~T249;100ms积算定时器有6点,从T250~T255。
积算定时器的指令形式和时序图如下图所示。该图中,定时器线圈T250的驱动输入X0接通时,T250的当前值计数器开始对100ms的时钟脉冲进行累积计数,当该值与设定值K100相等时,定时器的输出触点动作。在计数过程中,即使输入X0断电,它也会把当前值(如图中的6s)保持下来,当X0通电时,再继续累积4s,当累积时间为10s(100×100ms=10s)时触点动作,Y0闭合。因为积算定时器的线圈断电时不会复位,所以需要用复位指令RST使其强制复位,如下图,当复位输入X1接通时,定时器就复位,输出触点也复位
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Siemens 6ES7410-5HX08-0AB0
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