| 摘要 |
<p>A user program stored in a user program memory of a programmable controller includes a control program excluding the description defining an interlock condition and an interlock program which defines an interlock condition for the results of processing in accordance with the control program and is described separately from the control program. The control program is first read out from the user program, and an arithmetic operation is executed in accordance with this control program. The results of this operation are written into an I/O memory. The interlock program is then read out from the user program memory and processings are executed in accordance with this interlock program. The results of the operation of the interlock program are overwritten into the I/O memory.</p> |
