; PLC will happen
;DisablePLCTimeSync=1
; PLCTimeType informs time synchronization what kind of time
; is kept in PLC:
; local: PLC uses "wall clock time", with switches between DST and
; standard time, if DST exists in the selected Timezone
; If Linux synchronizes to an external server and passes time on
; to PLC, this means the PLC clock is changed twice a year.
; For PLC time-of-day interrupts this means they can be skipped
; (begin of DST) or executed twice (end of DST). If this might be
; an issue,try to avoid such interrupts between 2am and 3am.
; If Linux receives time from PLC, it assumes that this clock will
; switch between DST and standard time somehow (manually or
; automatically). If this doesn't happen (or is delayed) Linux time
; will be 1h behind the correct value. NCK and drives will still
; follow PLC clock.
;
; local-nodst: PLC uses local time as above, but without DST
; (summertime). All components (PLC, NCK, HMI, drives) always
; use standard time, even if the selected timezone has a DST.
; If Linux receives time from the PLC, it assumes standard
; (non-DST) time, too. If this is not the case, the Linux clock
; will be 1h ahead of the correct value.
; This time type has been used implicitly up to SW 4.7.3 and is
; still the default to maintain compatibility.
;
; utc: PLC clock contains universal time (= GMT+0)
; All components (PLC, NCK, HMI, drives) will use UTC.
; However, S7-300 engineering and HMI Operate 4.7 are not prepared
; for displaying UTC times as local times yet.
; This type makes synchronization simple, as no changes for
; timezone or DST are needed. It also avoids changes to PLC clock
; and supports applications across different timezones.
; If Linux receives time from the PLC, it assumes UTC there.
Configuring the system
2.3 Configuration file "basesys.ini"
NCU operating system
36 Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
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