Solution:

We add a new instruction in library version 4.10, which is 'AiUpdate'. You can find the introduction in manual p.6-30. Before accessing data with Get1718, you need to check the if the data is ready with AiUpdate.Like: void main() { int *returnvalue; /* one ADAM-5018(5017) moudel on slot 0 of ADAM-5510 */ if( AiUpdate(0, &channel) ==0) { Get501718(0,1, returnvalue); } }