Once the count exceeds ten, reset the counter and repeat the above sequence. Toggle the state of switch SW0 (I:1/0) continuously while observing the truth of Lamp 4. 3 of 6Ĥ Once you have completed modifying your program, download your program and place the PLC into the Run mode. Ensure that addresses and values are exactly as shown. Limit Comparison Modify or rewrite your existing program so that the first 3 rungs appear as shown below. The Greater Than OR Equal instruction goes true if the value in source A is Greater Than or Equal to the value in source B Since any PLC word including Timer and Counter accumulators and presets can be used as the source value in any of the basic comparison instructions, these instructions prove extremely versatile and are widely used in RSLogix programs. The Less Than OR Equal instruction goes true if the value in source A is Less Than or Equal to the value in source B GEQ. The Greater Than instruction goes true if the value in source A is Greater Than the value in source B LEQ. The Less Than instruction goes true if the value in source A is Less Than the value in source B GRT. The Not Equal instruction goes true if the source A and B values are Not Equal to each other LES.
The Equal instruction goes true if the source A and B values are Equal to each other NEQ. The basic comparison instructions are: EQU. These two values can be the data stored in two different word locations, or one can be the data stored in a word and the other can be a constant value. 2 of 6ģ Finally, indicate the observed state of the lamps, by circling the appropriate numbers below: Lamp 0 is On during counts: Lamp 1 is On during counts: Lamp 2 is On during counts: Lamp 3 is On during counts: Conclusions: The basic Comparison instructions compare the values stored in two memory locations. Keep doing this until you are convinced that the instructions are operating as described in the RSLogix documentation. Once the count exceeds nine or ten, reset the counter and repeat the above sequence. Toggle the state of switch SW0 (I:1/0) continuously while observing the truth of each of rungs as indicated by the lamps. Ensure that SW0 and SW1 are configured as Normally Open pushbuttons then place the PLC into the Run mode.
1 of 6Ģ Once you have completed entering your program, download your program to the PLC.
Now enter the following program being careful to enter the addresses and values exactly as shown. Clear out any existing program by selecting the "New" entry in the File menu, and then select the "Clear Data Table" entry in the Simulations menu. There were four tomato plants in each group (n = 4).1 LogixPro Introduction To Word Compare Instructions The RSLogix basic Comparison Instructions From the LogixPro Simulations Menu, select the I/O Simulation. \): Average growth (in cm) of tomato plants when treated with different brands of fertilizer.
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