OK as promised in the last lecture we are back and we're going to discuss the second half of inputs 2
and outputs. 3
These are analog devices if you remember from our discussion of digital those devices send a signal 4
of zero or one open or closed energiser de-energized very clean very simple analog devices are nothing 5
like that analog signals come in a range expressing various levels of precision. 6
Some of those ranges include four to 20 Mella amps. 7
Zero to 5 volts negative 10 to positive 10 volts 0 to 10 volts. 8
There's all kinds of different analog signals that you can work with there are variable frequencies 9
but typically for APRC you're going to work with either milah amps signals or DC voltage signals. 10
And when you look at something like a 4 to 20 scale that signal can be four point twenty eight mil amps 11
it can be sixteen point thirty seven Mella amps. 12
There are a lot more possibilities with Analog Devices than what you have with digital so it makes programming 13
it makes controlling a lot more interesting. 14
And there are a lot more considerations along the way. 15
One of the things that we're going to look at in Section 5 is resolution how precisely can we read a 16
signal or how precisely can we control an analog device. 17
So stick around. 18
It's a little bit complicated now. 19
It will get more so