VF701VF701

值编码器由机械位置确定编码，每个编码*不重复，它不受停电、干扰的影响，无需记忆，无需找参考点，而且不用一直计数，什么时候需要知道位置，什么时候就去读取，这样，编码器的抗干扰特性、数据的可靠性大大提高了。多圈值编码器另一个优点是由于测量范围大，实际使用往往富余较多，这样在安装调试时不必费劲找零点，将在测量范围内的某一中间位置作为起始点就可以了，从而大大简化了安装调试难度。

晶闸管输出型接口电路中，当输出锁存器的对应位为“1"时，其对应的光耦合器导通，把负载和电源连通起来，使得负载获得电流，发光二极管（LED）发光。当输出锁存器的对应位为“0"时，由于负载电源过零，其对应的光耦合器截止，把负载和电源隔断，使得负载不会获得电流，发光二极管（LED）不导通。 
上述三种类型的输出接口电路中，继电器输出型zui常用，它适用于交、直流负载，其特点是带负载能力强，但动作频率与相应速度慢。晶体管输出型适用于直流负载，其特点是动作频率高，相应速度块，但带负载能力小。晶闸管输出型适用于交流负载，相应速度快，带带负载能力不强。

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郑娟萍

厦门仲鑫航自动化设备有限公司     

　　编码器信号输出主要有并行格雷码输出、串行ssi输出、总线型输出、模拟量4~20ma输出。并行格雷码和模拟量输出信号读取简单但不适合长距离传输，串行ssi输出大部分是与西门子plc的ssi模块配套成本较高。现场总线型编码器用通讯方式传输信号，信号遵循rs485的物理格式，连接线少，传输距离远，对于编码器的保护和可靠性就提高了。信号的接收设备只需一个接口，就可以读多个编码器信号，多个编码器集中控制的情况下可以大大节省成本。

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MITSUBISHI MELSEC Q SERIES QJ71LP21-25 DATA LINK NEW

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THK GL15-1240L Linear Actuator With Yaskawa Motor

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