简易增量式PG卡3个LED灯的定义和功能

<p>LED1：状态灯&nbsp; &nbsp; &nbsp;1）常亮：扩展卡与控制板正在建立连接&nbsp; &nbsp; &nbsp;&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2）周期性闪烁（周期 1 秒，亮 0.5 秒，灭 0.5 秒）：扩展卡与控制板 连接正常&nbsp; &nbsp; &nbsp; &nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3）常灭：扩展卡与控制板断开连接&nbsp;</p><p><br/></p><p>LED2：断线灯&nbsp; &nbsp; &nbsp;编码器 A1、B1 路断线，则常灭，脉冲正常，则常亮。&nbsp;</p><p><span style="font-size: 16px;"></span><br/></p><p>LED3：电源灯&nbsp; &nbsp; &nbsp;扩展卡从控制板得电后即点亮。</p>