The multicolour LED element of the PSD signal tower from Phoenix Contact enables signalling of machine and system states with up to seven colours.
Selection of the colours red, yellow, green, blue, white, violet and turquoise is via the three control lines. In comparison to 5-level signal towers, two less digital outputs are required, and when compared to 3-level signal towers, one less digital output is required. The multicolour element, which can be used universally, also reduces storage costs, as optical elements in various colours do not need to be kept in stock.
The LED technology offers low energy consumption as well as a long service life of 50,000 h. The latter reduces maintenance costs in comparison to optical elements with light bulbs, which need to be replaced more often.
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