Programmable controller, programmable controller system, and method of creating execution error information

A programmable controller system, comprising:

• a programmable controller that performs processing in accordance with a control program;
• and
• an information processing terminal that allows the control program to be created or debugged, wherein
• the programmable controller comprises:
• a control program storage unit storing a control program and a callee control program that is called by the control program;
• a control program execution unit executing processing in accordance with the control program in the control program storage unit;
• a return address storage unit
• storing a return address to return to after execution of the callee control program by the control program execution unit, and
• deleting the return address when the return address is read out by the control program execution unit after execution of the callee control program finished;
• an input data storage unit storing input data for the callee control program;
• a mapping information storage unit storing mapping information that associates storing positions of the control program and the callee control program in the control program storage unit with program names of the control program and the callee control program;
• an execution error information management unit acquiring execution error information in a case in which an execution error of the callee control program occurs by the control program execution unit;
• and
• a communication unit communicating with the information processing terminal, the information processing terminal comprises:
• a communication unit communicating with the programmable controller;
• and
• an execution error information display processing unit issuing an acquisition request for the execution error information to the programmable controller and displaying, on a display unit, the execution error information acquired from the programmable controller,
• the control program execution unit of the programmable controller, in a case in which the callee control program is called during execution of the control program,
• stores a return address to return to after the execution of the callee control program is finished in the return address storage unit and
• stores input data for the callee control program in the input data storage unit, and
• the execution error information management unit of the programmable controller, in a case in which an execution error of the callee control program occurs,
• acquires the execution error information that includes the return address stored in the return address storage unit, the input data stored in the input data storage unit, and a program name, of which control program calls the callee control program that caused the execution error, that corresponds to the return address and is obtained by using the mapping information, and
• transmits, on receiving an acquisition request for the execution error information from the information processing terminal, the acquired execution error information to the information processing terminal.

A method for creating execution error information in a programmable controller that performs processing in accordance with a control program, the method comprising:

• a return address storing step of, upon reading of a command in the control program to call a callee control program, storing a return address to return to after execution of the callee control program;
• an input data storing step of acquiring and storing input data for the callee control program when the callee control program is called;
• a callee control program executing step of executing the callee control program;
• and
• a returning step of, upon finishing of the execution of the callee control program, returning to the return address so as to execute processing of the control program, wherein
• the callee control program executing step comprises:
• a first data acquiring step of, on occurrence of an execution error of the callee control program, acquiring the return address and the input data that have been stored;
• a second data acquiring step of acquiring a name of the control program that corresponds to the return address on a basis of mapping information that associates storing positions of the control program and the callee control program in the control program storage unit with program names of the control program and the callee control program;
• and
• an execution error information transmitting step of, in accordance with an instruction from an information processing terminal that is connected to the programmable controller, transmitting execution error information that includes the return address, the input data, and the name of the control program, of which control program calls the callee control program that caused the execution error, to the information processing terminal, and
• the return address, which is stored at the returning address storing step, is deleted when the control program execution finishes, when returning to the return address, after the execution of the callee control program finished at the returning step.