While the migration of data to a new operating or distributed control system may be the most common conversion scenario, these modern 22'' and 24'' HMIs actually increase operating and visualization comfort right across the board because their LED backlights generally ensure a more luminous display and better readability of images. This is also of benefit for users of older-generation process control systems. For more recent versions and for imminent upgrades of widely used DCSs, the large screens provide the required higher widescreen format resolutions. Hence, these HMIs support possible future upgrades at control level whilst displaying process images of current systems in the usual way, without requiring any new engineering or configuration. In chemical plants, pharmaceutical processes, and related areas of industry, upgrades from legacy HMIs from established manufacturers to the company's widescreen systems are usually accomplished quickly and with little effort: plugs and the explosion-proof terminal itself need to be replaced. Other existing installations such as stands or cables can be reused. Due to the LED backlights, the current HMIs use about half the energy of conventional TFT monitors with conventional backlights, despite their much larger displays. In addition, the new devices are free of any hazardous substances such as mercury and lead.
Achema 2012 Hall 11.1 - E41