diff --git a/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c b/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c
index 1c8582d..0239785 100644
--- a/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c
+++ b/BLE/DLD154Pro_Peripheral_28K/APP/peripheral_main.c
@@ -868,7 +868,7 @@ static void opt_input_poll(void)
     if (OPT_IN1 == 0) {  // 干接点接通 → 低电平
         if (_opt_low_since == 0) {
             _opt_low_since = mstick();
-        } else if (!_opt_armed && (mstick() - _opt_low_since >= 500)) {
+        } else if (!_opt_armed && (mstick() - _opt_low_since >= 100)) {  // 100 tick × 5ms = 500ms
             _opt_armed = 1;  // 满足 500ms, 等待上升沿
         }
     } else {  // 干接点断开 → 高电平