高速脉冲输出PTO功能及特点详解【PLC控制指令】

PLC高速脉冲输出PTO是指在西门子s7-200可编程控制器或s7-1200可编程控制器中，通过高速脉冲串输出指令（PTO）实现速度和位置控制的一种开环控制方式。PTO的功能是输出指定数目、占空比为50%的方波脉冲串，具有高速脉冲输出的特点。在PTO方式下，只能改变脉冲的周期值和脉冲数，周期值以µs或ms为增量单位，脉冲数在1-4 294 967 295范围内可调。需要注意的是，周期设置时应为偶数且大于2，设置值小于2系统将默认为2，否则会引起输出波形占空比轻微失真。每个PTO/PWM发生器都有一组配套参数包括一个控制字节和一个状态字，用于调节脉冲输出的周期值和脉冲数，确保系统稳定运行。Overall, PLC high-speed pulse output PTO is an open-loop control method implemented in Siemens s7-200 or s7-1200 programmable controllers for speed and position control through the use of pulse train output instruction (PTO). Its function entails generating a specified number of square wave pulses with a 50% duty cycle, characterized by high-speed pulse output. In PTO mode, adjustments are limited to changing the pulse's period value and count, with the period value incrementing in µs or ms and the pulse count adjustable within a range of 1-4 294 967 295. It's essential to set the period as an even number greater than 2 to avoid slight distortion in the output waveform's duty cycle, as values below 2 default to 2. Each PTO/PWM generator features a set of complementary parameters comprising a control byte and a status word to regulate the pulse output's period value and count, ensuring the system's smooth operation.