To clear the Bit #n of the integer variable v to '0'. n is an integer constant or variable of value between 0 and 15. v may be any integer variable or a system variable such as relay[n], output[n], etc. If v is a 32-bit integer, CLRBIT will only operate on the lower16 bits.

Following digital electronics convention, bit 0 refers to the least significant bit (right most bit) and bit 15 the most significant bit (left most bit) of the 16-bit integer variable. A quick way to find out the bit position and index of an I/O variable is to open their I/O table and check the "CH:BIT" column. Bit position beyond 9 are represented by hexadecimal number A to F.