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Chapter 2 Specification of Communication port for CPU module

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2.2.4 NTP client function

EHV-CPU is equipped with the SNTP (Simple Network Time Protocol) client function which retrieves the current

time from the NTP (Network Time Protocol) server and the SNTP server on the network.

The interval of retrievals can be set by specifying time and minute. And this function can control when the current

time is retrieved from a user program.

The value of the calendar clock in EHV-CPU can be synchronized by retrieving the

current time using the SNTP service on intranet or Internet.

SNTP seve

SNTP service includin

roviders

Figure 2.29 SNTP client function

Table 2.15 SNTP client specifications

Item Specifications

Communication protocol SNTP（Simple Network Time Protocol）

Retrieval interval Specified by user（00:01～99:59）

Retrieved time data yyyy/mm/dd/tt/mm/ss

Where the time data is stored Special internal output area（WRF00B～WRF00F）

Update of clock using

retrieved time

Updated by software in EHV-CPU

The current time retrieved with this function is stored on the Calendar clock are (WRF00B to WRF00F), and

update is performed at the specified interval. And the current time retrieved from the NTP server is stored in the

special internal output of EHV-CPU.

WRF00B: year

WRF00C: month and date

WRF00D: day

WRF00E: time and minute

WRF00F: second

Special internal output (Calendar clock data)

WRF40B: year

WRF40C: month and date

WRF40D: day

WRF40E: time and minute

WRF40F: second

Special internal output (Time for retrieving the current time from the NTP)

Figure 2.30 Word Special internal output for NTP function

Setup

The setup for the NTP function can be specified using the Control Editor.

Table 2.16 Setup for NTP function

Item Description

1 Valid Specifies the setup for NTP function to valid or invalid.

2 Server address Specifies the address of NTP server.

3 Connection interval Specifies the interval for retrieving the current time from NTP

server.

4 Time zone Specifies the time zone.

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