
Chapter 2 Specification of Communication port for CPU module
2 – 32
It is controllable using the bit special internal output from the user program when the NTP server is accessed. And
the setup of the time zone and the current time retrieved from the NTP server are stored in the word special internal
output.
(1) Bit special internal output
Table 2.17 Bit special internal output for NTP function
No. Name Meaning Description Set condition Reset condition
R900 NTP time retrieving
User program
Control Valid/Invalid
0: Invalid
1: Valid
Changes the timing when the current time from
the NTP server is retrieved, by a cycle from CE
or by a user program (R901).
ON by user OFF by user
R901 NTP time retrieving
request
1: Retrieval
start
ON when the current time is retrieved from NTP
server.
ON by user OFF by system
R902 NTP time retrieving
result
0: Success
of retrieving
1: Failure of
retrieving
Indicates the failure of retrieving the current
time from NTP server.
ON by system OFF by system
ON
OFF
ON
OFF
ON
OFF
When the retrieving time from NTP serve
is success, the retrieved data is stored i
the word special internal output.
ON at success
OFF at failure
ON by user OFF by system
RUN start
R900
R901
R902
ON by system
ON by user
OFF by user
OFF by system ON by user
ON or OFF by system
Figure 2.31 Bit special internal output for NTP function (when NTP setup is valid)
ON
OFF
ON
OFF
ON
OFF
RUN start
R900
R901
R902
ON by system
ON by user
OFF by system
OFF by system ON by user
When NTP setup is invalid, it is turned OFF
by system even if the control flag is turne
ON by user.
Figure 2.32 Bit special internal output for NTP function (when NTP setup is invalid)
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