diff --git a/protos/device_state.proto b/protos/device_state.proto
index 265f045..7a400be 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -47,6 +47,8 @@ message  SwitchState{
   bool reverse = 3;
   //道岔处于转动
   bool turning = 4;
+  // 道岔处于失表状态
+  bool split = 5;
 }
 //信号机状态
 message SignalState{