Hello everyone. My first post though I have read quite a few.
I'm learning industrial automaton which invariably leads me to electronics which I know little (OK nothing) about. But I do like to learn and hence this question and the many to come. Hopefully you won’t think I'm spamming the forum.
I've encountered sensors that are "monitored" and non-monitored. The simple version of these is the two wire edge non-monitored that has in it a N/O contacts. The one I don't understand is the monitored one as the controller, according to the manual, measures a resistance of 68Kohm to make sure the sensor is not damaged and at the same time the sensor is a N/O contact that when impacted closes the circuit and activating the controller in some way.
How does that work? Is there a resistor installed in series with the NO contacts? What it the basic circuitry that measures resistance in a device of this nature?
I encountered another on a security panel where the inputs are "supervised with or without end-of-line resistors" see page 7 of the following manual:
KT300
What's meant by end of line resistor and is the presence of the resistor monitored in much the same way as the safety edge sensor?
Thanks a lot.
NB: Next question is on conductivity sensors
I'm learning industrial automaton which invariably leads me to electronics which I know little (OK nothing) about. But I do like to learn and hence this question and the many to come. Hopefully you won’t think I'm spamming the forum.
I've encountered sensors that are "monitored" and non-monitored. The simple version of these is the two wire edge non-monitored that has in it a N/O contacts. The one I don't understand is the monitored one as the controller, according to the manual, measures a resistance of 68Kohm to make sure the sensor is not damaged and at the same time the sensor is a N/O contact that when impacted closes the circuit and activating the controller in some way.
How does that work? Is there a resistor installed in series with the NO contacts? What it the basic circuitry that measures resistance in a device of this nature?
I encountered another on a security panel where the inputs are "supervised with or without end-of-line resistors" see page 7 of the following manual:
KT300
What's meant by end of line resistor and is the presence of the resistor monitored in much the same way as the safety edge sensor?
Thanks a lot.
NB: Next question is on conductivity sensors