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.

615 series supports Profibus DPV1 with support of SPA-ZC 302 Profibus adapter.
If Profibus is required the relay must be ordered with Modbus serial options.
Modbus implementation includes SPA-protocol emulation functionality.
This functionality enables connection to SPA-ZC 302.
When the relay uses the RS-485 bus for the serial communication, both two- and four wire connections are supported.
Termination and pull-up/down resistors can be configured with jumpers on the communication card so external resistors are not needed.
The relay supports the following time synchronization methods with a time-stamping resolution of 1 ms.
REC670 IEDs (Intelligent Electronic Device) provide control solutions for any type of switchgear and different switchgear configurations.
If needed, you can add optional functions to easily increase the functionality of
the REC670 IEDs to meet the specific requirements of your switchyard.
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