Robotic arm operating system

A robotic arm operating system, comprising:

• a control device for generating an operation instruction;
• a plurality of joint devices coupled to the control device, each the joint device comprising a motor and a driver, the drivers of the joint devices receiving the operation instruction to generate a plurality of unlocking signals, one of the plurality of unlocking signals corresponding to one of the drivers, and the plurality of unlocking signals being used to release a braking state of the motors;
• and
• a brake release monitoring device coupled to the control device and the plurality of joint devices, the brake release monitoring device comprising a plurality of monitoring circuits, the plurality of monitoring circuits corresponding to the plurality of joint devices and being used to receive the plurality of unlocking signals to release the braking state, and notifying the control device to allow execution of the operation instruction, so that the motors of the plurality of joint devices operate according to the operation instruction;
• wherein when one of the plurality of monitoring circuits does not receive the unlocking signal, the brake release monitoring device notifies the control device that the operation instruction is not allowed to be executed;
• and
• wherein each the monitoring circuit comprises a relay and a switch unit, the switch unit connecting the relay and the control device, the relay comprising a control coil, a first common contact, a first normally closed contact, a first normally open contact, a second common contact, a second normally closed contact and a second normally open contact, the control coils connecting the drivers of the plurality of joint devices, one of the first common contacts being connected to a ground terminal, while the others being connected to the first normally open contacts, the first normally open contacts connecting the switch units, the second common contacts being connected to an unlocking power source, the second normally open contacts being connected to the motors of the plurality of joint devices.