Patent ID: 8384331

Claim:
A servo system comprising: a servo motor; an encoder attached to the servo motor, and having a feedback output, and a branched output different from the feedback output; a servo amplifier configured to control drive of the servo motor based on the feedback output of the encoder; and a safety control device, provided with a branched output of the encoder, configured to provide to an opening and closing unit arranged on a supply line of a drive power between the servo amplifier and the servo motor a safety output for controlling opening and closing based on the branched output; wherein the safety control device is configured to monitor presence of abnormality based on the branched output of the encoder, and open the opening and closing unit to shield the supply of drive power to the servo motor in a case where abnormality is present, wherein the safety control device includes a monitoring control input unit provided with a monitoring control input configured to switch enabling/disabling of the monitoring, and is configured to perform the monitoring when the monitoring control input is an input that enables the monitoring and does not perform the monitoring when the monitoring control input is an input that disables the monitoring.