How does the DCS system achieve time synchronization?

The DCS system can achieve the purpose of time synchronization by receiving the signal of the GPS Beidou standard synchronization clock.

Substation There are many systems or devices that need to be synchronized with the GPS Beidou clock in the power plant, such as DCS, PLC, NCS, SIS, MIS, RTU, fault recorders, microcomputer protection devices, etc. The use of GPS Beidou standard synchronous clock to unify the clocks of various systems of the whole plant or the whole station has been the standard practice adopted in the design of substation power plants.

The master clock of the distributed control system (DCS), auxiliary system programmable controller (PLC), plant-level monitoring information system (SIS), power plant management information system (MIS) and other units of substation power plant obtains the standard TOD (year, month, day, hour, minute, second) time through the appropriate GPS Beidou clock signal interface, and then limits the slave clock deviation in the system to a small enough range according to their respective clock synchronization mechanisms, so as to achieve the clock synchronization of the whole plant or the whole station. I am an engineer of Xi'an Synchronous Electronic Technology, I am specialized in time synchronization design, so I still know more about the time implementation of the DCS system, I hope mine is useful to you, you can also directly visit Xi'an Synchronous Electronic Technology ** to learn more about time synchronization solutions and time frequency knowledge.

GPS Beidou synchronous clock signal output contains a variety of types: including 1PPS 1PPM output, IRIG-B output, RS-232 RS-422 RS-485 output, NTP SNTP network output, IEEE1588 output, etc.

The following points should be paid attention to when determining the GPS Beidou synchronous clock:

These systems belong to thermal control, electrical, and system specialties, and if it is decided that the GPS Beidou synchronous clock provided by the DCS manufacturer realizes time synchronization (the current common practice), then before the DCS contract is negotiated, the cooperation between the specialties should be carried out to determine the requirements of the clock signal interface. (GPS Beidou synchronous clock can generally be configured with different quantities, types of output modules, if the relevant requirements cannot be determined in advance, the corresponding contract terms should leave room for adjustment.) ）

In the DCS design, we should not only pay attention to the absolute timing accuracy of the master and slave clocks of the system, but also pay more attention to the relative errors between the clocks. Because if you want to spread out the SOE points without degrading the event resolution too much, the key is to keep the deviation of each clock as small as possible.

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