AH500 Programming Manual API 0065 Symbol: S ： Pointer register POINTER/T_POINTER/ C_POINTER/HC_POINTER n ： Number of devices Word D ： Check result Bit Explanation: 1. The instruction CHKADR is used to check whether the value in S and (the value in S )+ n -1 exceed the device range. If the check result is that the value in S and (the value in S )+ n -1 do not exceed the device range, the device D will be ON. Otherwise, it will be OFF. 2. S supports the pointer registers PR, TR, CR, and HCR. 3. The operand n should be within the range between 1 and 1024. 4. The instruction CHKADR only can be used in the function block. Example: 1. Establish a program and a function block in ISPSoft.
Declare two variables in the program. 2. Declare VarPR1, VarTR1, VarCR1, and VarHCR1 in the function block, and assign the data types POINTER, T_POINTER, C_POINTER, and HC_POINTER to them respectively. 6-33 Instruction code Operand Function CHKADR S, n, D Checking the address of the contact type of pointer register Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S n D Pulse instruction 16-bit instruction (7 steps) 32-bit instruction － AH500 －