NTP time synchronization server (Beidou satellite clock server) installation steps
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Take article Siemens PCS7 system clock synchronous mode as an example:
PCS7 system based on TIA built, under the system contains the AS automation system, various components of the OS server / client, single station and various remote sites and so on. These components have their own clock system, if not configured unified clock system, may result in the OS alarm clock with a computer clock is inconsistent, redundant archive server can see the curve is inconsistent with a variable and other issues. Therefore, clock synchronization is very important for the normal operation of the PCS7 system.
Clock synchronization support system PCS 7 SIMATIC mode (the MODE SIMATIC) and NTP modes:
SIMATIC mode: This mode Siemens product-specific system clock synchronization, Siemens products are simple to configure and support this mode, it is recommended to use this method for clock synchronization in PCS 7.
NTP mode: Network Time Protocol (NTP, Network Time Protocol) is based on universal clock synchronization network communication packets, WAN and LAN support clock synchronization, the majority of Siemens products support this mode.
1.1 SIMATIC mode
SIMATIC mode for the system clock synchronization Siemens, Siemens-related products support this mode, the configuration is simple and easy to maintain.
Below, in a typical system, various components PCS 7 has its own clock source and the clock signal are each clock source with time zone information.
Clock assembly of Figure 1- 1 PCS 7 system
AS controller clock is UTC time zone;
when the OS clock is the local area;
the GPS received by the system clock is UTC time zone;
clock synchronization, Time Master (clock master) in the network published on clock synchronization signals are UTC time zone. Time Slave (slave clock) after receiving the clock signal, the time zone is set according to the local clock signal is adjusted automatically to synchronize the local clock is received.
SICLOCK recommended to use an external clock source as the clock source without an external clock source, the choice of OS Serve as the clock master. Since the CPU clock is not stable AS, AS is not recommended that the clock master.
1.2 NTP Mode
Network Time Protocol (NTP, Network Time Protocol) is a standard-based computer system clock synchronization packet communication network, NTP is the general mode of LAN and WAN system clock synchronization. By establishing the NTP server and the NTP client clock synchronization system, generally stop AS, CP, and OS client as a clock slave, the server OS or an external clock source as the clock master.
In NTP mode, as a slave clock initiates the communication to the clock master sends clock synchronization request, determine the most reliable and accurate clock in accordance with the response server, and the synchronous clock.
