diff --git a/components/step_motor_ctrl_module/step_motor_ctrl_module.cpp b/components/step_motor_ctrl_module/step_motor_ctrl_module.cpp
index d148ac3..2cd2aa0 100644
--- a/components/step_motor_ctrl_module/step_motor_ctrl_module.cpp
+++ b/components/step_motor_ctrl_module/step_motor_ctrl_module.cpp
@@ -742,7 +742,7 @@ int32_t StepMotorCtrlModule::module_get_reg(int32_t param_id, int32_t* param_val
 int32_t StepMotorCtrlModule::module_xxx_reg(int32_t param_id, bool read, int32_t& val) {
   switch (param_id) {
     MODULE_COMMON_PROCESS_REG_CB();
-
+    PROCESS_REG(kreg_robot_pos, read_pos(val), ACTION_NONE);
     PROCESS_REG(kreg_motor_shift, REG_GET(m_param.shift_x), REG_SET(m_param.shift_x));
     PROCESS_REG(kreg_motor_shaft, REG_GET(m_param.x_shaft), REG_SET(m_param.x_shaft));
     PROCESS_REG(kreg_motor_one_circle_pulse, REG_GET(m_param.distance_scale), REG_SET(m_param.distance_scale));