Real-time clock structure - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Modbus Communication Manual - REX640 Protection and control - PCL4 - IEC - ANSI - 16.02.2023

Table 1. Modbus real-time clock structure

Modbus address		Register contents	Values
Local Time	UTC Time
49201	49211	Control register	0...2
49202	49212	Year	2000...9999
49203	49213	Month	1...12
49204	49214	Day	1...31
49205	49215	Hour	0...23
49206	49216	Minutes	0...59
49207	49217	Seconds	0...59
49208	49218	Milliseconds	0...999