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Industrial PLC reference design cuts power, system costs

Posted: 29 Aug 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated? PLCs? transformer driver?

Maxim Integrated Products recently debuted its Corona reference design, providing designers with a way to reduce power, system cost and size for programmable logic controller digital-input sub-systems. The design also reduces isolated channels and leverages analogue integration for industrial control and automation applications.

One method of reducing the size of I/O solutions in PLCs is to reduce the number of digital channels that need to be isolated. Integrating three Maxim products including a transformer driver, the Corona design reduces isolated channels and eliminates the need for power-hungry optocouplers and discrete parts. These savings reduce power by 16 per cent, solution size by 38 per cent, and cost by 23 per cent.

Maxim's devices used in Corona are designed specifically for harsh industrial environments with operating temperature ranges from -40C to 125C, so they are ideal for use in PLCs and other automation applications.

The Corona reference design reduces isolation channels to four while the company's digital isolator eliminates the need for optoisolators; optimised for 16, 24, and 32 input channel designs, the digital input serialiser's SPI busses can be daisy-chained to further reduce isolation channel count, leading to increased savings. Maxim's latest reference design also uses 16 per cent less power than the traditional design approach and uses 38 fewer parts than a traditional design to create a less expensive integrated solution. The complete reference design is available in a 90x20mm Pmod form factor.

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