ABBPM3326B-6-1-2-E当PLC控制器投入运行后，其工作过程一般分为三个阶段，即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在整个运行期间，PLC控制器的CPU以一定的扫描速度重复执行上述三个阶段。在输入采样阶段，PLC控制器以扫描方式依次地读入所有输入状态和数据，并将它们存入I/O映象区中的相应得单元内。输入采样结束后，转入用户程序执行和输出刷新阶段。在这两个阶段中，即使输入状态和数据发生变化，I/O映象区中的相应单元的状态和数据也不会改变。因此，如果输入是脉冲信号，则该脉冲信号的宽度必须大于一个扫描周期，才能保证在任何情况下，该输入均能被读入。
PM3326B-6-1-2-E
输出功率:该电源模块О通常具有特定的输出功率，用于供电其他设备和系统。输出功率可能在规格表中列出。电压和电流范围:通常，该电源模块可以提供一定范围内的输出电压和电流，以满足不同设备的需求。这些参数通常在技术规格中指定。输入电压范围:电源模块通常需要特定的输入电压范围以正常运行。这些参数也会在规格表中提供。稳定性:这种电源模块通常设计用于提供稳定的输出电压和电流，以确保连接的设备能够正常工作。效率:电源模块的效率通常是一个重要参数，它表示模块将输入电能转换为有用输出电能的程度。高效的Q电源模块可以减少能源浪费。
PM3326B-6-1-2-E
在用户程序执行阶段，PLC控制器总是按由上而下的顺序依次地扫描用户程序(梯形图)。在扫描每一条梯形图时，又总是先扫描梯形图左边的由各触点构成的控制线路，并按先左后右、先上后下的顺序对由触点构成的控制线路进行逻辑运算，然后根据逻辑运算的结果，刷新该逻辑线圈在系统RAM存储区中对应位的状态;或者刷新该输出线圈在I/O映象区中对应位的状态;或者确定是否要执行该梯形图所规定的特殊功能指令。过载保护:它通常具有过载保护功能，可以在负载过重或短路情况下断开输出，以防止损坏。温度范围:电源模块通常在一定的温度范围内工作。工作温度范围通常在技术规格中指定。冗余性:一些电源模块支持冗余配置，以确保在一个模块故障时仍然能够提供电源。
PM3326B-6-1-2-E
ABBPM3326B-6-1-2-E After the PLC controller is put into operation, its working process is generally divided into three stages, namely input sampling, user program execution, and output refresh. Completing the above three stages is called a scanning cycle. During the entire operation period, the CPU of the PLC controller repeatedly executes the above three stages at a certain scanning speed. In the input sampling stage, the PLC controller sequentially reads in all input states and data in a scanning manner, and stores them in the corresponding units in the I/O image area. After the input sampling is completed, it enters the user program execution and output refresh phase. In these two stages, even if the input state and data change, the state and data of the corresponding units in the I/O image area will not change. Therefore, if the input is a pulse signal, the width of the pulse signal must be greater than one scanning cycle to ensure that the input can be read in any case.
PM3326B-6-1-2-E
Output power: This power module О Usually has a specific output power, used to power other devices and systems. The output power may be listed in the specification table. Voltage and current range: Typically, the power module can provide a certain range of output voltage and current to meet the needs of different devices. These parameters are usually specified in the technical specifications. Input voltage range: Power modules typically require a specific input voltage range for normal operation. These parameters will also be provided in the specification table. Stability: This type of power module is typically designed to provide stable output voltage and current to ensure that connected devices can function properly. Efficiency: The efficiency of a power module is usually an important parameter that represents the degree to which the module converts input electrical energy into useful output electrical energy. Efficient Q power module can reduce energy waste
PM3326B-6-1-2-E
During the user program execution phase, the PLC controller always scans the user program (ladder diagram) in a top-down order. When scanning each ladder diagram, always scan the control circuit composed of each contact on the left side of the ladder diagram first, and perform logical operations on the control circuit composed of the contacts in the order of left to right, top to bottom. Then, based on the results of the logical operations, refresh the corresponding bit status of the logical coil in the system RAM storage area; Or refresh the state of the corresponding bit of the output coil in the I/O image area; Or determine whether to execute the special functional instructions specified in the ladder diagram. Overload protection: It usually has an overload protection function, which can disconnect the output in case of heavy load or short circuit to prevent damage. Temperature range: Power modules typically operate within a certain temperature range. The operating temperature range is usually specified in the technical specifications. Redundancy: Some power modules support redundant configurations to ensure that power can still be provided in the event of a module failure.
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