Target hall crane did not work properly after power outage during Christmas time. The only movement could be operated is crane rotation. Power is supplied crane. The control board on N-S, E-W and up-down movement showed  F51 error code which is tripped limit.. All these clues pointed to a PLC control problem.  Don dale was asked for help. He used the crane control PLC program on an old computer  in RH control room reset the PLC system. Everything works fine after his reset.