The programmable controller is composed of electronic circuit with a micro-computer centered, however, it can be equivalently regarded as an integrated body of ordinary relay, timer, counter, etc.
The input relay (X) built in the programmable controller is driven by the external switch through the input terminal.
The output relay (Y) built in the programmable controller is provided with various internal contacts in addition to the external output contact (1a).
Besides, it is incorporated with various types of elements such as timer (T), counter (C), auxiliary relay (M), state (S), coil (F) for function contact (1a).
In addition, these elements (X, Y, M, T, C, S, F) are provided with many electrically normally-open contact (a-contact) and normally-close contact (b-contact), and can be used optionally within the programmable controller.
Consequently, if the conventional relay panel adopts 2a-pushbutton switch or 2-stage/4-notch selector switch, it will be only necessary to use 1a-pushbutton switch or 1-stage/4-notch selector switch to replace such conventional relay panel with the programmable controller.
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