Redundant output device

Abstract

The invention discloses a redundant output device comprising a DCS (distributed control system) master station, a first output module, a second output module and a redundant terminal module. One end of the DCS master station is connected with one end of the first output module, while the other end of the DCS master station is connected with one end of the second output module. The other end of the first output module is connected with a first end of the redundant terminal module, while the other end of the second output module is connected with a second end of the redundant terminal. A third end of the redundant terminal is connected with an instrument for controlling a scene. The first output module and the second output module same in structure are connected through a redundant channel for mutual information. By the arrangement, current stroke upon the instrument for controlling the scene is reduced during the course when a certain output module which is out of order is replaced by another output module, so that service life of the instrument for controlling the scene can be prolonged.

Description

technical field [0001] The invention relates to the field of signal output, in particular to a redundant output device. Background technique [0002] In the distributed control system DCS (Distributed Control System), there will be a large number of instruments, transmitters, sensors and other instruments in the control field. In order to make the instruments on the control site work normally, the DCS master station needs to provide 4-20mA analog current signals (this analog current signal is a DC signal) to the instruments on the control site through the output device. [0003] In the prior art, in order to provide reliable current signals to instruments controlling the field, generally at least two output devices need to be equipped to realize redundant functions. Among the above multiple output devices, only one is the main output device, and the others are standby output devices. Under normal circumstances, only the main output device outputs current signals to the ins...

AI Technical Summary

Problems solved by technology

[0004] Therefore, in the process of redundancy switchover, the instruments in the control field will experience the process of current signals from being present to non-existing and then back to being present, which will cause the instruments in the control field to bear a greater current impact, thus shortening the The service life of the instrument

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