ABB 23NG23 1K61005400R5001

The accuracy and resolution of the time stamp for a process event is important for analysing a process disturbance,especially when it is necessary to analyse events from and between different stations.

The RTU560 meets this requirement.The internal time management is controlled by the CMU communication boards.

The time resolution of the RTU560 is 1 ms for events,scanned by the directly connected I/O boards.Synchronization with absolute time can be achieved by one of the following four methods:

• Time synchronization by the network control center (NCC) via a periodically transmitted synchronization instruction with a communication protocol supporting this function

• Time synchronization using a real-time clock that receives the date and time from the GPS system

• Time synchronization using a real-time clock that receives date and time information from the DCF 77 time standard

• Time synchronization using SNTP V4 (RFC2030) on a LAN/WAN network

The RTU560 time management system synchronizes the RTU with the supplied absolute time with a high degree of accuracy.The absolute accuracy is mainly provided by the source for synchronization used,whereby GPS and DCF 77 allow an accuracy of 5 ms and better.The accuracy of time synchronization by the NCC depends on transmission speed,and the method used within the NCC.