How to Reduce Costs and Time for Wireless Hart in Industrial Networks
It is important for users considering utilizing a communication solution based on WirelessHart to understand its optimal position in the process and industrial network structures prior to installation. By doing so, it is possible to simplify the network architecture and system management, resulting in better connectivity along with both capital and operational cost savings.
The “Purdue Model of Process Control” explains how components in modern industrial networks collaborate. It distinguishes between five levels in the hierarchical structure of a network of control systems. With this model, users obtain a common model as well as standard terminology so that networks in all industrial application areas can be identically structured (see picture gallery, Fig. 1, right).
Each level has specified functions and actions for which it is responsible. These responsibilities range from creating preventive maintenance schedules and equipment renovation cycles in level 4, to different types of local instrument control found in levels 0, 1, and 2. Levels 0, 1, and 2 are directly connected to level 3.
This involves manufacturing operations and control, which is directly responsible for establishing immediate production schedules and maintenance routines. Having a better insight into the diagnostics data of the instruments installed in the plant or system makes it possible at level 3 to schedule maintenance routines more efficiently than in the past. Level 3 can be considered a plant network, as it essentially acts as a master of operations to the lower instrument control levels (see Fig.1, left).