One of the main features of the RTU is to manage events with time stamping. Time stamping requires effective time synchronization.
When acting as an IEC 60870-5-101/104 or DNP3 slave or server, the BMXNOR0200H module can synchronize its clock with a master or client station (SCADA). When the module receives the clock synchronization command, it updates its internal clock and posts the new value to the CPU. This maintains a consistent time on the local rack.
When acting as an IEC 60870-5-101/104 or DNP3 master or client, the BMXNOR0200H module sends clock synchronization commands to connected slaves. As with the case above, the clock is initialized from the CPU when it starts up. It gets the new time from the CPU every time master/client sends the time synchronization command.
NOTE: In a Modicon M580 PAC, it is mandatory to enable the NTP client to use the BMXNOR0200H module.
Slave/Server and Master/Client
When acting as both a master/client or slave/server, the BMXNOR0200H module periodically synchronizes its local time with that of the CPU through the rack.
