5SHY4045L0004 常闭触点指令将与其真实开关的操作相反

　　5SHY4045L0004 为了澄清，在解释梯形图PLC程序中的触点指令时，应牢记以下基本规则:

当PLC的输入通道通电时，其存储器中的每个输入位将为“1”，当其输入通道断电时，将为“0”

程序中显示的每个虚拟联系人促使每当它在其各自的位中读取到“1”状态时静止每当它在其各自的位中读取“0”状态时

有色隐形眼镜关闭的(在5SHY4045L0004 程序中传递虚拟电源)，而未着色的触点打开(阻止PLC程序中的虚拟电源)

在试图理解5SHY4045L0004 梯形图程序时，不能过分强调这些规则的重要性。事实的真相是现实世界的开关和接触指令状态之间的因果链-而不是直接等价。实际开关控制电力是否到达PLC输入通道，进而控制输入寄存器位是“1”还是“0”，进而控制触点指令是被激活还是处于静止状态。因此，PLC程序中的虚拟触点受约束的它们对应的真实世界的开关，而不仅仅是同一的新手通常会认为的现实世界中的同类。遵循这些规则，我们看到常开(NO)触点指令将模拟其真实开关的操作，而常闭(NC)触点指令将与其真实开关的操作相反。

To clarify, the following basic rules should be kept in mind when explaining contact instructions in ladder PLC programs:

When the input channel of the PLC is powered on, each input bit in its memory will be “1”, and when the input channel is powered off, it will be “0”

Each virtual contact displayed in the program causes it to stand still every time it reads a “1” state in its respective bit, and every time it reads a “0” state in its respective bit

The colored contact lenses are closed (virtual power is transmitted in the 5SHY4045L0004 program), while the uncolored contacts are open (virtual power is blocked in the PLC program)

When attempting to understand the 5SHY4045L0004 ladder program, the importance of these rules cannot be overemphasized. The truth of the matter is the causal chain between the switch and contact instruction states in the real world – rather than direct equivalence. The actual switch controls whether the power reaches the PLC input channel, which in turn controls whether the input register bit is “1” or “0”, and controls whether the contact command is activated or in a stationary state. Therefore, the virtual contacts in PLC programs are constrained by their corresponding real-world switches, rather than just the same type of real-world switch that beginners usually think of. Following these rules, we see that the normally open (NO) contact command will simulate the operation of its actual switch, while the normally closed (NC) contact command will be the opposite of its actual switch operation.