Processing Magazine

Triple Redundant Controller

February 12, 2013

OTEK-TRCExisting redundant process control systems are usually complex and expensive. This new fully redundant single unit controller TRC offers a low-cost alternative. It has three independent and isolated channels featuring 51 segment LED automatic tri-color bargraphs and four-digit displays. All three channels monitor a single process and continuously compare their output results. If any one channel “disagrees” with the other two, a CPU will (as selected) either disable the relays of the “faulty” channel, disable its analog out, blink/turn off the display, log and serially transmit a report or enable an audible alarm. A successful process is achieved when all three bargraphs display the same color and value.