An Electronic Device Description Language based approach for communication with dbms and file system in an industrial automation scenario

Abstract

In industrial production scenarios, there is often a need to access heterogeneous information sources such as production units but also DBMS (Data base management system) and/or a local or shared file system to realize the necessary workflows. EDDL (Electronic Device Description Language) provides a standardized way to access and exchange information with the devices that make up the automation system. This paper discusses an approach to use the EDDL approach to describe databases and files, which is to say that in this approach the databases and files both have been modelled as 'devices' and can be communicated with like any other device with its own device description. For this to work, EDDL based device descriptions were formulated for databases as well as files and the communication with the same was established with the help of an OPC UA Server, containing nodes corresponding to database entries and files (of a local file system), in its address space. The OPC UA Server used the EDDL based descriptions of the file system and databases to gain connection and access related information about the same, thus establishing the communication. The results of this approach have also been discussed in the following sections, along with a proposal for some enhancements to the EDDL standard. Observations and Future WorkAn important observation that came through during the development of this concept is the communication model for EDDL. Due to the fact that the communication standards targeted by EDDL such as Profibus and HART currently operate on a request response model, EDDL also follows this model. Therefore, for each access the EDD file needs to be consulted to find out the correct communication command for the request, which needs to be issued in order to retrieve the information from a device. However, other communication protocols natively provide subscription mechanisms and events that are not supported by EDDL. For example when we would like to subscribe to the value of a particular variable, we expect to receive periodic updates about the value of that variable, or whenever the value changes. In an event based communication model events are generated based on some specific preconditions. To overcome these limitations, we developed and implemented an extension to the EDDL model with possibilities for the inclusion of communication protocols that provide subscription and event based communication in the existing communication definition of EDDL. In our model we have defined commands (in the EDD file) for subscription to nodes in the address space, which is essentially and even based service. When a client subscribes to a particular node, the EDD file provides information about how to subscribe to the underlying entity, the ServerEngine (described above) takes care of the event management and generates OPC UA subscription events whenever the value of the underlying entity changes. The way subscriptions are handled in the underlying devices might be different in this case which is managed by the communication driv...

A Dynamic Taint Tracking Optimized Fuzz Testing Method based on Multi-modal Sensor Data Fusion

“…In the past ten years, many security incidents and potential and possible dangers made the security situation of IIS increasingly serious. Figure 2 shows the statistic of IIS security incidents in recent years, and the data came from IS-CERT (The Internet Systems Cyber Emergency Response Team) [7][8][9][10][11][12][13].…”

A dynamic taint tracking optimized fuzz testing method based on multi-modal sensor data fusion

“…In the past 10 years, many security incidents and potential and possible dangers made the security situation of IIS increasingly serious. Figure 2 shows the statistic of IIS security incidents in recent years, and the data came from IS-CERT (The Internet Systems Cyber Emergency Response Team) [7][8][9][10][11][12][13].…”

A Dynamic Taint Tracking Optimized Fuzz Testing Method based on Multi-modal Sensor Data Fusion

“…In the past ten years, many security incidents and potential and possible dangers made the security situation of IIS increasingly serious. Figure 2 shows the statistIIS of IIS security incidents in recent years, and the data came from IIS-CERT (The Industrial Internet Systems Cyber Emergency Response Team) [7][8][9][10][11][12][13].…”