| 摘要 |
PURPOSE:To attain the direct transfer of programs between the same kinds of controllers by providing the output side with a modulation circuit and high and low level switching and selecting means and providing the input side with an input signal level converting means and a demodulation circuit. CONSTITUTION:When the contents stored in a program memory 10 are to be outputted to an external audio cassette tape recorder or the same kind of sequence controller, the contents of the memory 10 are guided to an external output terminal 4a through a modulation circuit 15 and resistors 16, 17. In case of input, the audio signal inputted from an input terminal 4b is amplified by an amplifying circuit consisting of resistors 26-28 and an operational amplifier 23, and the amplified signal is read out by a CPU7 through a frequency discriminator 22 and a gate circuit 21. Relay contacts 18d, 24a are connected in parallel to a resistor 6 on the input side and a resistor 27 on the output side of an I/O part 40 respectively. Switching these contacts 18d, 24a enables one terminal to transmit and receive high and low levels. |
