The PLC CPU obtains the timestamp data from the time clock in the Ethernet interface.
The CPU only uses this timestamp for Ethernet Global Data exchanges. The timestamp
from the Ethernet interface does not affect the time of the CPU's internal time clock.
CPU Ethernet
interface
CPU
time
clock
CPUE05
timestamp
time
clock
EGD with
timestamp
13.4.4.1 Synchronizing the Timestamp
The timestamp clock in the Ethernet interface is synchronized to either the clock in the
CPU or an external Network Time Protocol (NTP) server. NTP is supported in
IC200CPUE05-HK and previous versions only.
• The CPU Time Clock: If no NTP servers are configured, the Ethernet interface’s
built-in time clock is synchronized once, at power-up or restart, to the clock in the
CPU. Because the clocks in the other devices on the network are not synchronized
with the CPUE05, their timestamps cannot be compared accurately.
CPU Ethernet
interface
CPUE05
time
clock
timestamp
256 GFK-1503E VersaMax PLC User Manual
For public disclosure
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