The following example involves an AND function, so a lamp is required to turn on if and only if two buttons in the example are pressed. The implementation using the programming table is shown below in Table 8.3.
Table 8.3 Table of the switching on of a lamp using the AND function with momentary actuations
If you look at Table 8.3 and compare it with Table 8.2, you can see that unlike Table 8.2, this one has two buttons, each connected to a different physical input of the PLC: E0 and E1; Therefore, we will assign them two different labels, “Button1” and “Button2,” which will appear in the “Label” field of the Inputs area. The lamp connection will be at physical output S.0 and it was assigned the label of “Lamp”.
Table 8.3 shows the input buttons and output actuator momentarily activated, so the corresponding boxes should be marked with an asterisk (*). There are now two conditions for turning on the lamp: one is that Button 1 is pressed, and the second is that Button 2 is pressed. Therefore, an asterisk (*) is placed in the input corresponding to E.0and another at the entrance corresponding to E1. If either of the two buttons is not pressed, the lamp will turn off, as exemplified in Figures 8.5, 8.6, 8.7 and 8.8.
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