ABB Relion 620 Series Protocol Manual

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address "0". Thus, all IEDs in the same serial network can be synchronized at the sametime.Method 1: Synchronization in one stepThe registers 49201...49208 (49211...49218) should be written in one multipleregisters preset request (function 16) by a Modbus TCP/IP client or by a serialinterface master. The IED's Modbus address or the Modbus broadcast address can beused with the serial interface. If the clock is written in one step, the write value of theregister 49201 (49211) is not checked by the IED.Method 2: Synchronization in three steps1. The client reserves the time synchronization by writing value "1" to the register49201 (49211). If necessary, check that the reservation value is zero at thebeginning. If the time synchronization writing is already reserved by anotherclient, the IED returns the exception response 03.2. The client writes the time structure to the IED. This can be done in one transactionor alternatively each register can be written separately.3. The client sets the clock by writing "2" into the register 49201 (49211). When thevalue "2" is written, the timesync registers are latched onto the IED's internalclock and the reservation in 49201 (49211) is released.The Modbus broadcast address cannot be used with thesynchronization method 2.There is an internal timeout for the clock setting. The time synchronization reservationis released if the clock is not set within two minutes. The client can abort the timesynchronization at any time by writing "0" into the register 49201 (49211). In that casethe real-time clock is not set at all.Other Modbus clients can read the currently running real-time clock even if the timewriting is reserved by another client.3.4.13 Device informationThe device information of the IED can be read from the Modbus registers49001...49083.If the information data are in practice shorter, the trailing registers inthe response are filled with the value "0".The Modbus device information is based on the internal IEC 61850 deviceinformation model of the IED. All internal descriptions are coded as ASCII strings.The Modbus device information ASCII string includes the information from the IED.1MRS757645 B Section 3Vendor-specific implementation620 series 61Communication Protocol Manual