I cant use it to control the pose ,but i can control the joint,what's wrong with me

[wdw753951]

My cpp code is :
output.mutable_robot()->mutable_joints()->mutable_position()->mutable_values()->Add(a);
egm_interface->write(output);

when use the \Joint
the rapid code is:
EGMSetupUC ROB_1, egmID1, "default", "UCdevice"\Joint,\CommTimeout:=10;
EGMActJoint egmID1;
EGMRunJoint egmID1, EGM_STOP_HOLD \J1;
it sucess ,the robot can move

But when i use the \Pose
the rapid code is
VAR pose corr_frame_offs:=[[0,0,0],[1,0,0,0]];
EGMSetupUC ROB_1, egmID1, "default", "UCdevice"\Pose,\CommTimeout:=10;
EGMActPose egmID1,\Tool:=tool0, \WObj:=wobj0,corr_frame_offs,
EGM_FRAME_WORLD, tool0.tframe, EGM_FRAME_TOOL;
EGMRunPose egmID1, EGM_STOP_HOLD \x \y \z;
cpp code is:
output.mutable_robot()->mutable_cartesian()->mutable_pose()->mutable_position()->set_x(500);
output.mutable_robot()->mutable_cartesian()->mutable_pose()->mutable_position()->set_y(300);
output.mutable_robot()->mutable_cartesian()->mutable_pose()->mutable_position()->set_z(800);
egm_interface->write(output);
the robot can recieve the data ,so the rapid process is not time out after 10 second ,but the robot dont move

what's wrong with me