| 摘要 |
PURPOSE:To easily incorporate a display program to a programmable controller with use of a ladder language with no conversion of other program language including a basic language, etc., by giving a call instruction to display the control state in an input mode of a program produced by a ladder chart. CONSTITUTION:A call instruction 100 is put in the middle of the sequence control of a ladder chart and a user has input of an instruction SUB for shift to a subroutine together with its address number as a call instruction as shown in a diagram. The call instruction put into the ladder chart is executed in a ladder language to avoid such a troublesome job where a programming action is carried out after conversion into a basic language, etc. Thus a display program is supplied in a simple operation. When a call instruction is received, a subroutine is started by the call instruction to display the state of the sequence control. Then, the actual temperature of an electric furnace, for example, is measured. This measured temperature is supplied to a CPU8 and converted into the display data by a display data converting means 7. |
