Machine control device

A machine control device that controls operation of a machine on a basis of a program and executes a diagnostic test of a safety function of the machine, the machine control device comprising:

• a diagnostic test time calculation unit that calculates a scheduled execution time T1 of the diagnostic test;
• a program execution time prediction unit that predicts a predicted ending time T2 of the program before executing the program;
• a diagnostic test execution determination unit that determines whether to execute the diagnostic test at a predetermined time, by determining whether the predicted ending time T2 of the program exceeds the scheduled execution time T1 of the diagnostic test;
• and
• a diagnostic test execution unit that executes the diagnostic test,
• wherein, in a case in which the predicted ending time T2 of the program exceeds the scheduled execution time T1 of the diagnostic test, the diagnostic test execution determination unit instructs the diagnostic test execution unit to execute the diagnostic test prior to the scheduled execution time T1 of the diagnostic test before executing the program.