Functional block with FF (foundation fieldbus) interface

Abstract

The invention discloses a functional block with an FF (foundation fieldbus) interface. The functional block comprises a data storage and a control logic module. The data storage comprises an operational data storage which opens for the external upper layer module of DCS (distributed control system). By real-time monitoring and online modifying data in the operational data storage, the external upper layer module of the DCS monitors in real time and modifies online the data of an instrument functional block. The control logic module only modifies the data of the instrument functional block when data content in the operational data storage changes, namely, modification is performed when data in the instrument functional block needs to be modified, and accordingly network load is lowered. By the functional block with the FF interface, the DCS is can control an FF device. The functional block can be built in a central control unit of the DCS. Mixing control of the DCS and the FF device can be achieved by building control schemes between the central control unit and the lower field instruments by the aid of the external upper layer module of the DCS, functions such as real-time monitoring, online modifying, warning and browsing can be performed by the DCS to the instrument functional block.

Description

technical field [0001] The invention belongs to the fields of industrial automation control and field bus, and in particular relates to an FF (Foundation Fieldbus, Foundation Fieldbus) interface function block. Background technique [0002] FF technology is a fieldbus technology specially designed for the field of industrial control. FF can provide a fully digital, two-way, multi-node communication connection between intelligent field devices and industrial control systems. Devices from different manufacturers based on the same FF protocol The same system can be accessed through FF, and the interoperability between devices can be realized, so as to achieve the best system integration. At present, FF has been supported by the world's major control equipment suppliers and has become an international standard. It has an excellent prospect in the field of industrial control. Correspondingly, FF smart instruments in FF fieldbus equipment (referred to as FF equipment) have gradual...

AI Technical Summary

Problems solved by technology

In the prior art, DCS realizes the online modification of instrument function blocks by triggering parameter modification commands through modification events, but this method will generate parameter modification commands regardless of whether the parameter values ​​change before and after the modification event, such as the common When modifying the parameters of the instrument function block through the self-defined function block in DCS, in each cycle of the operation of the self-defined function block, it will issue a parameter modification command to the instrument function block, that is, no matter whether the data in the instrument function block needs to be modified or not , the self-defined function block will execute the modification operation in each cycle of its operation, and send the parameter modification command to the instrument function block, which will continue to generate messages at the fieldbus network layer, resulting in a high network load

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