Chapter 6 Applied Instructions 7. Since ES3 Series PLC is with various built-in input types, different maximum input frequency are suggested. See the table below for reference. Example 1 NETWORK1: When PLC runs, the value of the counter HC0 is cleared and the counter counts because SM621 is OFF. At this time, SM408 is ON for the first time. So the instruction loads the setting value 10 to the counter HC0 and the counter begins counting. NETWORK2: After SM408 switches from OFF to ON ten times, the value of the counter HC0 matches the setting value 10, and the contact of HC0 is ON.
After HC0 is ON, the value of the counter keeps increasing because SM408 continues to change from OFF to ON even though the value of HC0 has reached the setting value. NETWORK3: 6_ When HC0 continues to count up and the value reaches the setting value 20, the counter counts down because SM621 is ON in the program. After SM408 switches from OFF to ON ten times and the value of HC0 decreases from 10 to 9, the contact of HC0 is OFF. After the contact of HC0 is OFF, the value of HC0 still continues to decrease because SM408 continues to change from OFF to ON. 6-275 Model Name Input Type Input Number Maximum Input Frequency ES3 Series Sinking / Sourcing X0 ~ X7 200K Hz X10 ~ X17 10K Hz