Safety system, program, and method

A non-transitory computer-readable recording medium recording thereon a program to be executed with a computer in a safety system comprising a safety controller that executes a safety program, the program causing the computer to perform:

• acquiring a collection result of an input value over a predetermined period, the input value being a value of an input signal selected previously in one or a plurality of input signals input to the safety controller;
• and
• reproducing a behavior of the safety program over the predetermined period based on the input value collected over the predetermined period, and expressing visually an operating state of the safety program at an appointed point of time in the predetermined period.

A method performed in a safety system comprising a safety controller that executes a safety program, the method comprising:

• collecting an input value over a predetermined period, the input value being a value of an input signal selected previously in one or a plurality of input signals input to the safety controller;
• and
• reproducing a behavior of the safety program over the predetermined period based on the input value collected over the predetermined period, and expressing visually an operating state of the safety program at an appointed point of time in the predetermined period.