Control device, control method, and non-transitory storage medium storing control program

A control method comprising:

• a communication management process of managing data communication using cyclic communication conforming to a predetermined communication cycle for a field network;
• a computation process of executing a running-in operation program to measure a propagation delay time from received data of data for actual measurement of propagation delay transmitted to the field network, and to detect an operation state of the field network using a measurement result of the propagation delay time;
• a result output process of outputting a detection result obtained in the computation process;
• a propagation delay time measurement process of performing measurement of the propagation delay time from the received data of the data for actual measurement of propagation delay;
• and
• a monitoring process of monitoring of a bandwidth load of the field network from the propagation delay time, wherein the bandwidth load is a ratio of the propagation delay time of all frames transmitted within one cycle to the predetermined communication cycle.

A non-transitory storage medium storing a control program causing a computation processing device to execute:

• a communication management process of managing data communication using cyclic communication conforming to a predetermined communication cycle for a field network;
• a computation process of executing a running-in operation program to measure a propagation delay time from received data of data for actual measurement of propagation delay transmitted to the field network, and to detect an operation state of the field network using a measurement result of the propagation delay time;
• a result output process of outputting a detection result obtained in the computation process;
• a propagation delay time measurement process of performing measurement of the propagation delay time from the received data of the data for actual measurement of propagation delay;
• a monitoring process of monitoring of a bandwidth load of the field network from the propagation delay time, wherein the bandwidth load is a ratio of the propagation delay time of all frames transmitted within one cycle to the predetermined communication cycle.