System time
The system time (time and date) is communicated in S-Mode and not affected by LTE filtering.
Alarms and remote time adjustment
Alarms and remote time adjustments are transmitted in LTE-Mode (LTE broadcast address). This address is listed in the predefined LTE filter table and therefore subject to LTE filtering.
Two-way and one-way communication
The diagram shows the following:
The system time (time and date) is always transmitted by devices on the primary line to devices on the secondary line and vice versa 🡪 two-way communication.
Normal (route)
If the filter is set to "Normal (route)" in the area/line couplers and IP routers, alarms and remote time adjustments are transmitted only from the secondary line to the primary line 🡪 one-way communication.
Route all
If "Route all" is set, alarms and remote time adjustments are transmitted from the secondary line to the primary line and vice versa 🡪 two-way communication.
Block all
"Block all" means that the transmission of alarms and remote time adjustments is blocked 🡪 no LTE telegram communications.
Time synchronization
In a network with couplers and IP routers, only one RM… controller can function as time master (see Section 6.1.2).
The time can only be adjusted remotely via a time slave if the time master is located on the same line or on the next higher line.