SEMI E148 - Specification for Time Synchronization and Definition of the TS-Clock Object

Volume(s): Equipment Automation Software
Language: English
Type: Single Standards Download (.pdf)

This Standard was technically approved by the Information & Control Global Technical Committee. This edition was approved for publication by the global Audits and Reviews Subcommittee on May 12, 2014. Available at and in June 2014; originally published July 2007; previously published November 2009.


The purpose of this Document is to define the requirements for any factory component computer clock that requires synchronization of time to maintain and manage date/time accurately and consistently by using a common time synchronization protocol.


It defines the TS-Clock object for accessing factory application and equipment time value and synchronization status, describes an example of network time synchronization architecture, and specifies which protocol to use for precise time synchronization of clocks in factory environments that use network communication.


The Network Time Protocol (NTPv3) protocol for time synchronization is specified in this Document because it is applicable to systems communicating by local area networks supporting multicast messaging including but not limited to Ethernet. This protocol enables heterogeneous systems that include clocks of various inherent precision and stability to synchronize.


The time synchronization standard applies to factory components that collect, store, distribute, and process time-sensitive data. Factory components include applications used to manufacture devices, maintain equipment, provide process resources, condition the factory, control processes. In particular, it includes the equipment used in manufacturing.


Referenced SEMI Standards

SEMI E5 — SEMI Equipment Communication Standard 2 Message Content (SECS-II)
SEMI E39 — Object Services Standard (OSS)
SEMI E120 — Specification for the Common Equipment Model (CEM)
SEMI E134 — Specification for Data Collection Management

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