janitza UMG 512-Pro, User Manual And Technical Data

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UMG 512-PRO www.janitza.com
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11.8 PTP configuration
The device supports the Precision Time Protocol ( PTP ) in accordance with the Standard Annex J IEEE
1588-2008 PTP Default Profile .
The PTP protocol is executed in a logical area known as the domain. The time specified by the protocol in
one domain is independent of the times in other domains.
The PTP protocol enables precise time synchronization in the network from the time server (master) to
the clients (slaves). The prerequisite for this is the PTP capability of the client. The reference time for the
system is determined by what is known as the Grandmaster Clock (see the section „11.8.3 Example: PTP
timing according to IEEE 1588-2008 and clock types“)
Time synchronization in a network is achieved by the exchange of PTP time control messages. Clients
use the time control information in the PTP messages to set their time to that of the time server (master) in
their part of the hierarchy.
While NTP uses the client-server model – each client must be configured with a name or the IP address –
the system configures itself according to the default PTP profile.
For the Device (as of firmware version 5.017), activate PTP (or NTP):
·In the GridVis ® software (device configuration).
·Via the parameter
_MODE_NTP ( the Modbus address can be found in the Modbus address list of your
device at www.janitza.com) .
11.8.1 Important Modbus parameters for the PTP configuration of the device
Meanings of the Modbus parameters:
Parameter name Data type Permission Entry (range)
_MODE_NTP
(refer to section „11.8.2 PTP parameter _MODE_NTP“)
int RD/WR NTP/PTP activation
_PTP_DOMAIN
1)
byte RD/WR Default = 0 (0 - 127)
_PTP_ANNOUNCE_RECEIPT_TIMEOUT
2)
byte RD/WR Default = 3 (2 - 10)
_PTP_MANAGEMENT_INTERFACE
3)
short RD/WR Default = 0 (0 - 1)
1.Domain number (default domain = 0). A PTP domain is a range of PTP clocks (devices) which synchro-
nize themselves with each other using the PTP protocol.
2.Selects the PTP Announce Receipt Timeout. This parameter specifies the number of intervals that are
allowed to elapse without receipt of an announce message (default = 3).
3.0 (default) – Device supports PTP configuration via the Modbus.
1 - Alternative method of configuration (enables a comprehensive configuration via the interface).
11.8.2 PTP parameter _MODE_NTP
In this context, the entries have the following functions:
Parameter _MODE_NTP Entry Description
TIME_PROTOCOL_NONE = 0 No time protocol is active. Manual time configuration.
TIME_PROTOCOL_NTP_BROADCAST = 1 NTP mode “Listen”, PTP deactivated.
TIME_PROTOCOL_NTP_ACTIVE = 2 NTP mode “Active”, PTP deactivated.
TIME_PROTOCOL_PTP = 3 PTP mode is activated, NTP deactivated.