Elevator safety system

An elevator safety system, comprising:

• a plurality of communication controllers connected to equipment of an elevator and configured to communicate, over a network, signals of a plurality of types including a safety control signal;
• a control device connected to a first communication controller, which is one of the plurality of communication controllers, and is configured to execute operation control of the elevator,
• wherein each of the plurality of communication controllers comprises an error ratio measurement instrument configured to measure error ratio of the network, based on a bit error of data that is received over the network, and
• wherein the control device is configured to:
• start communication of the safety control signal when the error ratio is less than a safety communication start determination value before communication of the safety control signal is started;
• and
• execute the operation control by switching the operation state of the elevator in accordance with the error ratio measured by the error ratio measurement instrument that is included in the first communication controller, before beginning of and during the communication of the safety control signal.