修改

applications/PLC_link.c

@@ -1,4 +1,5 @@
 /*
+#include <packages/qmodbus/inc/modbus.h>
 #include <packages/qmodbus/inc/modbus.h>
  * Copyright (c) 2006-2021, RT-Thread Development Team
  *
@@ -12,6 +13,7 @@
  */
 
 #include "rtthread.h"
+#include "modbus.h"
 
 #define DBG_TAG "plc.rtu"
 #define DBG_LVL DBG_LOG