UMG 604-PRO
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11. 10 PTP configuration
The device supports the Precision Time Protocol (PTP) in accordance with the Standard An-
nex 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
section "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.de).
11.10.1 Important Modbus parameters for the PTP configuration of the device
Modbus parameters have the following meaning:
Parameter name Data type Permission Entry (range)
_MODE_NTP
(cf. section 1.1.2 “PTP parameters” _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 synchronize
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).
11.10.2 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.
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