i discover after a default that the led run and the led default of a plc allen bradlley 1200 were alight and it was not possible for me to access to it. i think that it is damaged but the matter is that i don't know how to test the i/o cards without the plc. i also wanted to know if all i/o diagnostics leds of the card begin to shine directly when power is on then the one selected by the process remain alight. excuse my English language please i am trying to do my best.
the references of the card are 1762 iq16, 1762iq8, 1762ob16
thanks u so much .