An optical measurement device configured for connection to an industrial network, the industrial network functioning to synchronize time between a master device and a slave device, the optical measurement device includes: an interface module configured to receive a synchronization signal transmitted on the industrial network from the master device within a fixed communication cycle; and a measurement unit configured to perform optical measurements in a measurement cycle. The measurement unit synchronizes when a measurement is taken with the communication cycle in accordance with the synchronization signal received by the interface module.

A synchronous controller is connected to each of boards by one communication wire, and one communication path is formed between the synchronous controller and each of the boards. A multiple synchronization signal S in which a plurality of synchronization signals are multiplexed is transmitted from the synchronous controller to each of the boards. Signal extraction units as extraction means for recognizing synchronization signals included in the multiple synchronization signal S and extracting the individual synchronization signals are provided in the boards, respectively. The individual synchronization signals are extracted from the multiple synchronization signal S input to the boards by the signal extraction units, respectively.

A method for transmitting time-synchronized data from a controller of an automation system comprising a local time to at least one subscriber of the automation system, wherein the automation system comprises a server having a reference time.