BENTLY NEVADA 990-04-50-02-00

• 型号：990-04-50-02-00


• 数量：3


• 制造商：　厦门兴锐达自动化设备有限公司


• 有效期：2019/10/10 0:00:00

BENTLY NEVADA 990-04-50-02-00

BENTLY NEVADA 990-04-50-02-00

BENTLY NEVADA 990-04-50-02-00

     机械设备在各工步的所需的时间根柢不变，因此可以用时间为参看，在可编程控制器宣告信号，相应的外部执行机构开端动作时起动一个守时器开端定计时，守时器的设定值比正常情况下该动作的持续时间长20%左右。如某执行机构在正常情况下工作10s后，使限位开关动作，宣告动作结束的信号。在该执行机构开端动作时起动设定值为12s的守时器守时，若12s后还没有收到动作结束的信号，由守时器的常开触点宣告缺点信号，该信号连续正常的程序，起动报警和缺点闪现程序，使操作人员和修补人员能活络判别缺点的种类，及时选用清扫缺点的方法。
       在系统正常工作时，PLC的输入、输出信号和内部的信号（如存储器为的情况）相互之间存在着断定的联络，如出现反常的逻辑信号，则说明出了缺点。因此可以编制一些常见缺点的反常逻辑联络，一旦反常逻辑联络为ON情况，就应按缺点处理。如机械运动过程中先后有两个限位开关动作，这两个信号不会一起接通。若它们一起接通，说明至少有一个限位开关被卡死，应停机进行处理。在梯形图中，用这两个限位开关对应的存储器的位的常开触点串联，来驱动一个标明限位开关缺点的存储器的位就可以进行检测。

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