| 摘要 |
PURPOSE:To obtain a programmable controller PCS which can easily cope with the change of a sequence program by securing a system where a CPU performs the control to transfer the sequence program stored in a sequence program memory part or a data RAM to said RAM or memory part in a read or write function mode of a changeover switch. CONSTITUTION:When a sequence program is copied, a memory pack storing the relevant sequence program is attached to a programmable controller main body 1 via a connector 20. When an operator sets a slide switch 14 at a store position, the terminal of a position 1 has a signal '0' and a CPU 2 decides the signal via an input buffer circuit 12. The CPU 2 decides that the store signal is turned on from a fact that a terminal 1 has a signal '0' and then turns on a pilot lamp 15 via a latch circuit 13 to transfer the contents of a user memory 11 to a data RAM 4. When this transfer is over, the lamp 15 is turned off and it is decided whether the signal of the terminal 1 is equal to '0' or '1'. Then it is decided that the store signal is turned off as long as the signal of the terminal 1 is equal to '1'.
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