a) the black button starts the display. red button stops the display
b) when start 'moving row' sequence is displayed. each row of lamps is lit for 1.5sec starting from the top row down. this is played 4 times
c) two seconds after the completion of the above process, the digit 1, 2 and 3 are displayed in sequence. each letter flashes three times in a row. each flash last for 1 second. the interval between flashes is 0.7sec. the letter sequence is repeated continuously until the red button is pressed
d)the seqence of the displayed digits can be reversed repeatedly at any stage with the white button
From the above, I need help with the program. steps a,b and c can be done but I do not know how to implement the reverse function. Please help me as i am a still a student still learning the PLC.
b) when start 'moving row' sequence is displayed. each row of lamps is lit for 1.5sec starting from the top row down. this is played 4 times
c) two seconds after the completion of the above process, the digit 1, 2 and 3 are displayed in sequence. each letter flashes three times in a row. each flash last for 1 second. the interval between flashes is 0.7sec. the letter sequence is repeated continuously until the red button is pressed
d)the seqence of the displayed digits can be reversed repeatedly at any stage with the white button
From the above, I need help with the program. steps a,b and c can be done but I do not know how to implement the reverse function. Please help me as i am a still a student still learning the PLC.
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