I have a circuit consisting of an emergency stop button, a SNAP-IDC5, a reset button and a relay coil with a resistance of 600ohm.
The circuit is powered by 24v DC supply.
The SNAP-IDC5 acts simply as an indication that the Emergency Stop button circuit is healthy.
The 24V supply goes through the E Stop button and then through the OPTO module and on to the reset button and then onto a relay coil which energises contacts off the relay.
When the reset button is pressed to energise the relay coil there is only about 4 volts on the ‘out’ side of the OPTO module, the OPTO module therefore seems to be ‘dragging’ down the voltage to a level where it isnt sufficient enough to allow the relay coil to be energised.
Has anybody any ideas why the OPTO card is acting as a large resistance and ‘dragging’ down the voltage?