Extended instructions
9.1 Date, time-of-day, and clock functions
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
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Your program can also use RTM execution mode 7 to save the runtime meter values in a
memory card. The states of all timers at the instant RTM mode 7 is executed are stored in
the memory card. These stored values can become incorrect over time as the hour timers
are started and stopped during a program run session. You must periodically update the
memory card values to capture important runtime events. The advantage that you get from
storing the RTM values in the memory card is that you can insert the memory card in a
substitute CPU where your program and saved RTM values will be available. If you did not
save the RTM values in the memory card, then the timer values would be lost (in a substitute
CPU).
Note
Avoid excessive program calls for memory card write operations
Minimize flash memory card write operations to extend the life of the memory card.
Table 9- 15 Condition codes
Incorrect runtime meter number
A negative value was passed to the parameter PV
Overflow of the operating hours counter
The input parameter MODE contains an illegal value
Value cannot be saved to MC (MODE=7)
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