The relay supports the following time synchronization methods with a time-stamping resolution of 1 ms.
Ethernet-based
• SNTP (Simple Network Time Protocol) With special time synchronization wiring
• IRIG-B (Inter-Range Instrumentation Group - Time Code Format B)
The relay supports the following high accuracy time synchronization method with a time-stamping
resolution of 4 µs required especially in process bus applications.
• PTP (IEEE 1588) v2 with Power Profile

The IEEE 1588 support is included in all variants having a redundant Ethernet communication module.
IEEE 1588 v2 features
• Ordinary Clock with Best Master Clock algorithm
• One-step Transparent Clock for Ethernet ring topology
• 1588 v2 Power Profile
• Receive (slave): 1-step/2-step
• Transmit (master): 1-step
• Layer 2 mapping
• Peer to peer delay calculation
• Multicast operation
Required accuracy of grandmaster clock is +/-1 µs.
The relay can work as a master clock per BMC algorithm if the external grandmaster clock is not available for short term.
The IEEE 1588 support is included in all variants having a redundant Ethernet communication module.
In addition, the relay supports time synchronization via Modbus, DNP3 and IEC 60870-5-103 serial communication protocols.

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