NEITHER 9481: Why dose the relay turn off all channels once every time when the vi is executed?

Hello all, I use cRIO 9025 and NI 9481 to develop a program. The relay is used as switches.  I designed it, is that when I run the vi, the channels of the relay are all on. When the port of entry of the digital input/output module gives a signal to the relay, the relay channels is disabled. However, whenever I run the vi, the relay is disabled once and then trund once again. May I ask why is this happenning? I guess that's because the default state of the relay is disabled. Is there a way to fix this?

Thank you very much!!

All the relay modules are like that and there is nothing that can be done as far as I know. Electromagnetic relay are generally loaded spring and holding (switch closed) by a voltage sent to the relay. They will turn off when restart you on the relay controls. You can set the State of the relay on real as the first thing when you start your VI, but beyond that you would have to solve your electrical problem, control switching relay at a constant voltage during the startup of the program. However, in most cases it would be risky and unreliable. However, there are many different types of relay and you did not specify that you are using.

See basic operation section, section of this article to read on how to relay themselves by default to the State of open circuit:

http://en.Wikipedia.org/wiki/relay

Tags: NI Software

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