Trigger relay unit of programmable controller, trigger transmission system, trigger transmission method, and recording medium

A trigger transmission method implementable with a trigger relay unit in a programmable controller, the method comprising:

• receiving, with a receiver, a first trigger signal from a first detector of a plurality of detectors to detect a trigger to log control data about device control, the first trigger signal indicating the trigger;
• and
• transmitting, with a transmitter, the first trigger signal to a second detector different from the first detector when the receiver receives the first trigger signal,
• wherein the transmitter excludes, from a transmission target, a second trigger signal different from the first trigger signal and received by the receiver in a period from when the receiver receives the first trigger signal to when the transmitter completes transmitting the first trigger signal.

A non-transitory computer-readable recording medium storing a program executable by a trigger relay unit in a programmable controller, the trigger relay unit being connected to a plurality of detectors to detect a trigger to log control data about device control, the program causing the trigger relay unit to function as:

• a receiver that receives a first trigger signal indicating the trigger from a first detector of the plurality of detectors;
• and
• a transmitter that transmits the first trigger signal to a second detector different from the first detector when the receiver receives the first trigger signal,
• wherein the transmitter excludes, from a transmission target, a second trigger signal different from the first trigger signal and received by the receiver in a period from when the receiver receives the first trigger signal to when the transmitter completes transmitting the first trigger signal.