Manually Updating PLC Time Without NTP Using Cyclic Code

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1

Hello,

If there is a difference between the PLC time and the actual time, I manually reset it in Info-Data/Time.

I do not want to use NTP. instead, I want to implement a Cyclic code that directly updates the time by inputting it manually.

Is there a library available that can help implement this functionality?

Thank you.

2

The set functions from the AsTime library can be used, if NTP is not activated.

3

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Hello,

To implement a cyclic code that directly updates the time by manually inputting it, you can use the AsTime library. This library provides function blocks and functions for handling time-related operations, including setting the system time.

Steps to Implement Cyclic Time Update:

  1. Add the AsTime Library to Your Project:
  • In Automation Studio, go to the Logical View.
  • Right-click on the Libraries node and select Add Library.
  • Search for and add the AsTime library.
  1. Create a Function Block for Setting the Time:
  • Use the DTSetTime function block from the AsTime library to set the system time.
  • This function block allows you to set the current time using the DATE_AND_TIME data type.
  1. Implement Cyclic Time Update:
  • Create a cyclic task class with a suitable cycle time (e.g., 1 second).
  • In the cyclic task, read the manually input time from a global variable or a user interface.
  • Use the DTSetTime function block to update the system time with the manually input time.

Example Code:

(* Define a global variable to hold the manually input time *)
VAR
    manualTime: DATE_AND_TIME;
END_VAR

(* Cyclic task to update the system time *)
PROGRAM CyclicTimeUpdate
VAR
    setTimeFB: DTSetTime;  (* Instance of the DTSetTime function block *)
END_VAR

(* Read the manually input time from a global variable or user interface *)
manualTime := GetManualTimeFromUI();

(* Set the system time using the DTSetTime function block *)
setTimeFB(IN := manualTime);

Explanation:

  • manualTime: This variable holds the time that is manually input by the user.
  • setTimeFB: This is an instance of the DTSetTime function block.
  • GetManualTimeFromUI: This is a placeholder function that you need to implement to read the time from a user interface or another source.

Further Information:

By following these steps, you can create a cyclic task that updates the system time based on manually input values without using NTP.

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