Study the data transfer counter program of Figure 10-48 and answer the following

Question

Study the data transfer counter program of Figure 10-48 and answer the following questions:

What determines the preset value of the counter?

Outline the steps to follow to operate the program so that the PL1 output is energized after 25 off-to-on transitions of the count PB input.

Ladder logic program Inputs L1 CU Count PB CTU COUNT UP C5:1 DN Counter Count PB 000 Accumulated O Reset PB MOV MOVE N7:10 Source N7:10 Destination C5:1.PRE PL1 C5:1/DN C5:1 Reset PB RES Figure 10-48 Program for Problem 2. Output PL1

Explanation / Answer

The value of count PB should reach the value of C5:1 which determines the preset value of the counter.

The steps involved in the progra of the logic ladder program so that PL1 output is energised after 25 off to on transitions of the count PB input are as follows:

The counter CTU operates for every input of Count PB which is abouve C5:1.

The value accumulated is moved on to N&:10 everytime the destination counter has preset value of C 5:1

After everytime C5:1, PL1 gets energised and the count PB which is the input to the up-counter is reset.

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