PM866K01根据现场输入信号的不同，可将输入模块分为开关量输入模块和模拟量输入模块。 开关量输入模块的作用是把各种开关信号变成CPU所需的TTL标准信号。按输入端电源类型，又可将其为直流输入模块和交流输入模块。输入信号经分压、限流、滤波后再通过光电耦合转换成TTL（5V）标准信号。 模拟量输入模块的作用是把现场连续变化的模拟量信号如温度、流量、电流、电压等转换成CPU能够处理的若干位数字信号。模拟量输入电路一般由运放变换、模转换（A/D）、光电隔离等组成。
PM866K01
可编程逻辑控制器或 PLC 在当今的各种流程和制造行业中无处不在。PLC 最初旨在取代机电继电器系统，以便为修改控制系统的操作提供更简单的解决方案。无需重新连接大量继电器，只需从 PC 或编程设备快速下载，即可在几秒钟内更改控制逻辑。PLC 是一种工业级数字计算机，旨在执行控制功能，尤其适用于工业应用。今天的大多数 PLC 都是模块化的，允许用户添加各种功能，包括离散和模拟输入和输出、PID 控制、位置控制、电机控制、串行通信和高速网络。与继电器组等较旧的技术相比，PLC 更易于故障排除和维护、更可靠、更具成本效益且用途更广泛。
PM866K01
PM866K01 can be divided into switch input module and analog input module based on different on-site input signals. The function of the switch input module is to convert various switch signals into TTL standard signals required by the CPU. According to the type of input power supply, it can also be divided into DC input module and AC input module. The input signal is divided into voltage, limited current, filtered, and then converted into a TTL (5V) standard signal through optoelectronic coupling. The function of the analog input module is to convert continuously changing analog signals such as temperature, flow, current, voltage, etc. on site into several digital signals that the CPU can process. The analog input circuit generally consists of operational amplifier conversion, analog-to-digital conversion (A/D), optoelectronic isolation, etc.
PM866K01
Programmable logic controllers or PLCs are ubiquitous in various processes and manufacturing industries today. PLC was originally designed to replace electromechanical relay systems in order to provide simpler solutions for modifying the operation of control systems. No need to reconnect a large number of relays, just quickly download from a PC or programming device and change the control logic in a few seconds. PLC is an industrial grade digital computer designed to perform control functions, particularly suitable for industrial applications. Most PLCs today are modular, allowing users to add various functions, including discrete and analog inputs and outputs, PID control, position control, motor control, serial communication, and high-speed networks. Compared to older technologies such as relay groups, PLC is easier to troubleshoot and maintain, more reliable, cost-effective, and more versatile.
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