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Regarding DATE_AN_TIME to String Conversion for S7-300

Hello Khang,

You are correct to point out the limitations when using instructions designed for S7-1200/1500 with an S7-300 PLC. The DATE_AN_TIME instruction is primarily intended for newer Siemens controllers.

For S7-300, you'll need to use a combination of other instructions and potentially some programming logic to achieve the same result. Here's a suggested approach:

• Separate Date and Time: Use instructions like RD_DATE and RD_TIME to read the current date and time into separate variables.
• Convert to String: Utilize STRING_CONV instruction (or similar string manipulation blocks) along with data conversion functions (e.g., converting integer representations of date/time components to characters) to build the desired string format. You'll likely need to manually format the string.

Important Resources:

• Siemens Support - Converting Date and Time to String (S7-300/400) - This provides example code and detailed guidance.
• SiePortal - Search for "S7-300 date time string conversion" for additional documentation and FAQs.

Please note that manual string formatting on the S7-300 can be more complex than using the dedicated DATE_AN_TIME instruction on newer PLCs.

Sincerely,

Siemens Self Support