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Example

Built-in High Speed Counter for PLC-ES and PLC-FB Special Program

High-speed counting can be achieved using various hardware options, depending on your system requirements. It can be implemented using the PLC-ES modular or the Micro PLC CPU types, both of which are suitable for smaller, space-constrained projects that still demand reliable high-speed pulse counting

Registering the Special Program

Serial Protocol New Program in MapleLogic

Step 1: In the Project Window, right-click Program and left-click New Program.

Built-in HSC Example New Project in MapleLogic

Step 2: In the New Program window, left-click HSC for PLC-ES.

  • Optionally, for organization, under Program Name, the name of the program and ID can be changed.

Step 3: Left-click OK.

Configuring the High-Speed Counter Program

Built-in HSC Example Configuring the High-Speed Counter Program in MapleLogic

Step 4: Under Start Address, select the data register section to use.

  • IMPORTANT: The high-speed counter program can reserve 52 WORDs, 26 for channel 1, 26 for channel 2, starting at the base data register.
    • In this example, D0 ~ D51 are reserved.
      • Please refer to the high-speed counter parameters for more information.

Step 5: Under channel, select channel 1 or channel 2.

Step 6: For the high-speed counter to actively count, check Enable Count.

  • If this is unchecked, the high-speed counter won’t count up or down.
  • Optionally, checking:
    • Enable Cmp. Output(Y) enables comparison output.
    • Latch Count enables non-volatile memory counting.
      • The current value enables be retained if the device is powered off.
    • Enable Ext. Preset enables an external preset value.

Step 7: Left-click Save to save the changes made to the high-speed counter program.

  • Optionally, if the PLC is currently in RUN mode, left-click Online Modify.

Scan Program

Built-in HSC Example New Scan Program in MapleLogic

Step 8: Create a new scan program.

  • This example will always compare D100 ≤ D21.
    • D21 is the current value of the high-speed counter on channel 1.
Built-in HSC Example Compare logic in MapleLogic

Step 9: After downloading the program to the PLC, the value of D21 can be monitored. The coil, Y10.D is deenergized.

Built-in HSC Example Compare logic Less Than or Equal To in MapleLogic

Step 10: Once the value of D21 was greater than or equal to the value of D100, 45,678, the coil Y10.D energizes.