Giorgis,
On older Fanuc 0's, the ladder will need to be modified to allow this. It is a simple change, but takes special equipment (A PC-Mate yellow box or laptop running the correct version of Fanuc's Fladder program, and an E-Prom writing accessory. Also, the mode switch will need modification to allow the "Tape" mode to be switched on.
Warren
www.uptimecorp.com