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I have an application where I need to allow a Modbus Master to set the real time clock of the PLC.  That way any scheduled cycles take place synchronized with the rest of the plant.  Is this possible and if so what would be the process for doing so? any examples available?

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The RTC is stored in SI 30 - SI 33. System Integer (SI) addressing starts at 9000h and are standard 16-bit signed integers. If you have difficulty writing directly to SIs, then write to MIs and trigger a bit in your PLC program to Store Direct the MIs to SIs when you want to set your RTC.

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