Abstract: A program creation assistance device of the present disclosure includes a program creation section and an execution time estimation section. The execution time estimation section includes a processing time estimation section and a communication time estimation section. The processing time estimation section executes a processing time estimation process which obtains an estimated processing time by estimating a processing time of a corresponding process for each of multiple icons created in the program creation section, based on a specified CPU and OS. The communication time estimation section executes a communication time estimation process which obtains an estimated communication time by estimating a communication time for each of a necessary number of communication paths, based on the specified CPU and OS.

Abstract: A non-transitory computer readable-medium storing a compiler to cause a computer to perform processing for compiling sequence programs including a declaration of a global variable and generating an execution program to be executed by a PLC. When there is a change in a memory address in the PLC assigned to the global variable between before and after edit of a declaration of the global variable, the compiler gives an execution code to synchronize a first value stored at a memory address assigned to an unedited global variable with a second value stored at a memory address assigned to an edited global variable to an execution program corresponding to the sequence program that references the edited global variable.

Abstract: A non-transitory computer readable-medium storing a compiler to cause a computer to perform processing for compiling sequence programs including a declaration of a global variable and generating an execution program to be executed by a PLC. When there is a change in a memory address in the PLC assigned to the global variable between before and after edit of a declaration of the global variable, the compiler gives an execution code to synchronize a first value stored at a memory address assigned to an unedited global variable with a second value stored at a memory address assigned to an edited global variable to an execution program corresponding to the sequence program that references the edited global variable.