Overview

This topic describes the attributes related to the NTP service.

For more information on NTP attributes and their configuration, refer to the manual of the module.

Configuration

Attribute

Description

Enabled

When the check box is cleared (false, default value), the NTP service for the module is disabled and the other attributes of the NTP category are hidden.

Version

The value depends on the firmware version of the module:

  • SNTP: Uses the Simple Network Time Protocol (SNTP). For firmware version earlier than V4.00.

  • V4: Uses the NTP version 4 protocol. For firmware version V4.00 and later.

NTP State

Defines the NTP role of the module.

Possible values:

  • For Version = SNTP:

    • NTP Client: The network time service (SNTP) synchronizes the clock of the module to that of the time server.

    • NTP Server: The module can synchronize clocks of NTP clients.

  • For Version = V4:

    • Client/Server: The module has the role of both client and server.

    • Server Only: The module can synchronize clocks of NTP clients.

Stratum

Specifies the relative position of the server in the NTP network.

The attribute is only available for modules with firmware version V4.00 and later.

Range: From 1 to 15

Default value: 10

NOTE: When NTP State is set to Client/Server, the value is used in orphan mode.

Update CPU Time

When the check box is selected (true), the module acts as an NTP client, which provides the NTP time to the CPU clock.

The attribute is available only when NTP State for the module is set to NTP Client .

Server Configuration

This subcategory is available only when the NTP State attribute is set to NTP Client or Client/Server .

Modules with firmware version earlier than V4.00:

Attribute

Description

Primary NTP Server IP Address

Enter the IP address of the server that is used to synchronize the clock of NTP clients.

Secondary NTP Server IP Address

Enter the IP address of the backup server that is used to synchronize the clock of NTP clients.

Polling Period (s)

Time (in seconds) between updates from the NTP server.

Range: 1...120 s in 1 s increments.

NOTE: For certain modules, the attribute is not available.

Format

Lets you select the IP address format that you can use for each NTP server.

Possible values:

  • IPv4 (default)

  • IPv6

The attribute is available only for BMENUA0100 modules.
NOTE: In a redundant PAC, the primary and secondary NTP server attribute values that are configured for a BMENUA0100 module in local rack A are not automatically applied to the module in rack B.

Modules with firmware version V4.00 and later:

Attribute

Description

NTP Server 1 IP Address to NTP Server 8 IP Address

You can configure the IP address of up to 8 servers that can be used to synchronize the clock of NTP clients.

Specify the preferred NTP server to be used by the CPU by selecting its check box.

Quality Threshold (ms)

Threshold (in milliseconds) for NTP accuracy.

Range: 1...200 ms

Default value: 50 ms