Siemens SIMATIC S7-1200 Reference Manual page 36

Basic instructions
Time-of-day functions
✔ ✔ ✔ ✔
Set time-of-day (STEP 7 V 5x: SET_CLK)
✔ ✔ ✔ ✔
Read time-of-day (STEP 7 V 5x: READ_CLK)
✔ ✔
Read local time
✔ ✔
Write local time
✔ ✔
Synchronize slave clocks
✔ ✔ ✔
Read system time
✔ ✔
Set time zone
✔ ✔ ✔ ✔
Runtime meters
✔ ✔
Set runtime meters
✔ ✔
Start and stop runtime meters
✔ ✔
Read runtime meters
✔
Set time-of-day and time-of-day status
Local time
✔ ✔
Calculate local time
✔ ✔
Calculate local time from base time
✔ ✔
Calculate base time from local time
✔ ✔
Set time-of-day interrupt using local time
A5E33284667-AF
Extended instructions
Description
Technology
STL
LAD/FBD
(not S7-1200)
WR_SYS_T
RD_SYS_T
RD_LOC_T
WR_LOC_T
SNC_RTCB
TIME_TCK
SET_TIMEZONE
RTM
SET_RTM
CTRL_RTM
READ_RTM
SET_CLKS
LOC_TIME
BT_LT
LT_BT
S_LTINT
Communication
SCL
Page 35