Clock: Indirect Function Example

1. Place an Indirect Time Function in the net.

   

2. Link an operand. The Time function requires two consecutive MIs; the second is automatically assigned by the program.  These 2 MIs define a time range.  The first MI sets the Start Time for the function, the second MI marks the End Time.  When the RTC is within this range, power flows through the function block.  

   

3. Place a Day Of The Week function so that it touches the first function, enabling power flow. This function uses a 16-bit register to contain a 7-bit bitmap representing the days of the week.

   

4. Link an operand.

   

5. Place a Day of The Month function so that it touches the last function.

   

6. Link an operand.  This function uses an ML or SL to contain a 32-bit bitmap.

   

7. Place a Month function so that it touches the last function.

   

8. Link an operand.  

   

9. Place a Direct Coil in the net as shown below, and link an operand. The Ladder net is complete; now create the supporting HMI Displays and Variables.

 

Here, you will create variables that enable Start Time, End Time, Day of Week, and Day of Month, and month to be set from the controller keyboard.

Start & End Time Variables

1. Open the HMI Display editor.

   

2. Create and name a Display: Start and End Time.

   

    

3. Draw a text box, and enter fixed text: Start Time.

   

4. Draw another text box, and enter the text: End Time.

   

5. Create a field to hold the first Time Function Variable, Start Time.

   

6. Define the Variable as Keypad Entry and link it as shown below.

6. Create a field and define the End Time Variable, linking it to MI 31.

   

This Display is complete.

Day of Week & Day of Month Variables

1. Create and name a new display; Select Day and Date.

2. Draw a text box, entering the text Select Day.

3. Draw another text box, entering the text Select Date.

4. Create a field to hold the Select Day Variable.

5. Define this variable as Day of Week, and link it to MI 32.

   

6. Create a field to hold the Select Date Variable.

7. Define this variable as Day of Month, and link it to ML 33.

   

This Display is complete.

Month Variable

1. Create and name a new display; Select Month.

2. Draw a text box, entering the text Select Month.

3. Create a field to hold the Select Month Variable.

4. Define this variable as Month, and link it to MI 34.

   

This Display is complete.

1. Open Display Start and End Time.

2. Click on the first Jump Condition, and select SB 30: HMI keypad entries completed.

   

3. Click on Display, and select Display 2.

   

4. Open Display Select Day and Date,click on the first Jump Condition, and select SB 30..

5. Click on Display, and select Display 3, Select Month.

   

Set the Jump from Display 3 according to your requirements.