SAFETY SIGNAL OUTPUT DEVICE, MOUNTING MEMBER, SAFETY SYSTEM, AND METHOD FOR DISABLING MONITORING

A safety signal output device has a connector that can electrically connect a second device different from a first device. The connector includes at least a first terminal, a second terminal, a third terminal, and a fourth terminal. The safety signal output device outputs electrical signals with different timings to the first terminal and the third terminal respectively. The safety signal output device outputs a safety signal during a state in which electrical signals that correspond in timing to the output timing of the electrical signals to the first terminal are input to the safety signal output device from the fourth terminal, and electrical signals that correspond in timing to the output timing of the electrical signals to the third terminal are input to the safety signal output device from the second terminal, the safety signal output device outputs the safety signal. When an attachment member is attached to the connector, the first terminal and third terminal are electrically connected and the third terminal and the second terminal are electrically connected.