Industrial robot system

An industrial robot system for operating in conjunction with a machine tool, said robot system comprising a robot unit having an arm, a hand, a set of Z-, .theta., and R-axis motors, a set of Z-, .theta., and R-axis motion detectors, an operation panel means having a starting button, and a controlling means, said controlling means comprising a memory for storing instruction data including a feed rate, Z-, .theta., and R-axis instruction values and data of functional instructions, input circuits, an address counter coupled to the input circuits through an AND gate, a controlling data register receiving a signal from the memory and the address counter through an AND gate and an OR gate, a present value register coupled to the robot unit, a comparator for comparing signals from the controlling data register and the present value register, a servo amplifier coupled to the comparator and to a switch for connecting and disconnecting a power supply circuit to the servo amplifier, wherein said input circuits are adapted to receive a WAIT signal from the machine tool, an INHIBIT signal from the machine tool, an EMERGENCY STOP signal from the robot unit, a starting signal from the operation panel means, and signals from said Z-, .theta., and R-axis motion detectors in accordance with the operating conditions of the machine tool and wherein said controlling means is further adapted to receive a HOLD signal from the machine tool produced in a HOLD condition sensing device, said HOLD signal being supplied to the input circuits, the input circuits including a first input of a flip-flop circuit which produces an "0" output signal in response to the HOLD signal preventing the address counter from being updated, so that the operation of the robot is stopped and is prevented from starting again unless the starting button in the operation panel means is pushed.