On a Yokogawa STARDOM, there are 3 LEDs (HRDY, RDY and CTRL) for indicating various operating state of the STARDOM FCJ / FCN / FCN-RTU. Each of these LED can be either Off, On, Fast Blinking or Slow Blinking.

The table below outlines all the possible combination of the LED states and its associated operational state of the Yokogawa STARDOM.
Note that if you get a combination of LED that is not displayed on the table below, it may be that your DIP switch on the STARDOM is incorrect or the STARDOM FCN/FCJ/FCNRTU has failure.

Xybernetics Yokogawa STARDOM - Status LED HRDY RDY CTRL
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I am a software developer in Calgary, Alberta, Canada with passion in getting my fingers in any new technology. I started software development when I was 10 years old and have never looked back. Now with well over 35 years of software development, I wanted to share some of these key knowledge with the people of the world in the wide web.