
2711TJBIP20DC A-B Communication Interface
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IN STOCK2711TJBIP20DC A-B Communication Interface
Each output instruction is executed by the controller when the rung is scanned and the conditions on the rung are true. When the rung is not scanned or the logic conditions on the rung do not create a true logic path, the output is not executed. The programming device allows you to enter a ladder logic program into the micro controller. In the following illustration, the electromechanical circuit shows PB1 and PB2, two pushbuttons, wired in series with an alarm horn. PB1 is a normally open pushbutton, and PB2 is normally closed. This same circuit is shown in ladder logic by two contacts wired in series with an output. Contact I/0 and I/1 are examine–if–closed instructions.➀ (For more information on this instruction, refer to page 6-4.) Input words 0 and 1 contain discrete input data. Unused inputs in the discrete inputs image space are reset during each input scan. Input words 2 and 3 are reserved and are not updated by the controller. These inputs have no direct effect on controller operation, but they can be modified like other data bits. Input words 4-7 contain the status of the four analog input channels respectively. Analog input image words are cleared at Going To Run (GTR). For enabled channels, the analog input image is updated on a cyclical basis. Output word 0 contains discrete output data. Output words 1-3 are reserved output image space. Unused outputs in both the discrete output image space and the reserved output image space have no direct effect on controller operation. But these outputs can be modified like other data bits. Output word 4 holds the value of the analog output channel.
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