1756-TBCH1756-TBCH

1756-TBCH

 当外部有信号输入时，控制系统采集连续的N个脉冲使RS触发器输出为“1”，只有当外部输入信号由“1”变成“0”时，RS触发器的复位端为“1”，将RS触发器的输出复位成“0”。而当有瞬间干扰脉冲时，CON计数器将采集不到连续的N个脉冲，CON计数器无法输出，这就起到了减少干扰的作用。（N一般情况下取2）
优点：响应速度快，对周期性的瞬时干扰起到了一定的抑制作用。1756-TBCH
缺点：不能消除超过CON计数器采样时间的干扰。
    除了CPU上集成的通讯接口外，每一个CPU上还可zui多扩展4个通讯接口。这4个通讯接口可扩展为任意的标准总线协议。
    CPU上集成的两个Modbus通讯接口和可选集成的以太网或ARCNET网络接口外，通过通讯扩展接口还能扩展：ProfibusDP-V1、DeviceNet、CANopen和以太网等总线接口。结构
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