| 摘要 |
PURPOSE:To facilitate the easy confirmation of an optional sequence operation as well as the easy check of an unconfirmed sequence operation, by giving designation of automatic or manual transition operations to each designated step. CONSTITUTION:An operator first uses a CRT device 4 and a prescribed format to designate a step No. and a transition operation and then gives a sequence execution command to a controller 2. The controller 2 receives this command and sets an initial effective step by a sequence execution command and executes continuously the sequence control through a processing flow with in a loop until an end command is given. In other words, a shift action is designated automatically at the present effective step. In such a case, the original transition conditions are checked and the shift is executed as long as the transition conditions are satisfied. While a transition command is waited for from the control in the case of a manual mode. Thus the operator gives a transition command when necessary while confirming the working of a plant 3. |
