Chapter 7 Function Block and Library AH5X0 series CPU module The system in an AH5X0 series CPU module reserves a fixed number of memory blocks for function block instances. The number of memory blocks varies with the model selected and every instance produced will occupy one P device. The size of every memory block is 4096 words. Owing to the fact that the memory blocks assigned to the function blocks in a project for an AH5X0 series CPU module are memories reserved by the CPU module, users can not view the assignment result in the windows for the function blocks. The following diagram is the call structure of function block for section 7.2.6 example. 7-25