IBM 610 workstation computer 3379

Most PLC calculations are hard and nasty - add these two numbers, multiply these two, divide. Rarely are you adding up a long column. In any case, 1st take the raw analog in, then scale, then do whatever. most of this is getting it compatible with a SCADA or HMI setup anyway.

We'll see it in testing since we have to simulate the full range of analogs anyway - such an error pops right out. More often than not, this rescaling is done for human consumption - i.e. to display a realistic number on a screen. Or in the case of my current one, to use the PLC's PID loop function more effectively - but there the controller's doing the scaling and tracking, I'm just telling it the flow range is 0 to 1600, which just means 0.00 to 16.00 million gallons a day....

You have to at times :) My cow-orkers all consider me a newbie because I haven't been inadvertently sprayed with sewage...yet... Thankfully, I have mostly freshwater stuff right now, but I've been in poop pumper stations (I have a rewrite of one coming up - I get a grand tour eventually, plus the one site rewrite-rewire-debug). one nice thing - it's not a 9-5 desk job - I get out in the field a lot, and it's always something different - packed tower aeration one month, transit tunnel another month, electric substation another. I get to see lots of cool poo and lots of warm steaming poo too :)