S7-200 RTC Registers

[Guest SirPLC]

Hello Siemens-Experts, I hope someone of you can help me with a small (and hopefully) easy question: Is it possible to access the RTC in a S7-200 through some registers or I need to use instructions to obtain the clock information? Have a nice day! SirPLC

[Crossbow 295]

There are two commands for reading/writing the real time clock into the PLC's memory. They are TODR (time of day read) and TODW (time of day write) and they will copy the real-time clock to/from the PLC's internal memory. Each requires 8 bytes, and their format is detailed in the S7-200 Programming Manual, which is available to download here.