Programmable Logic Controllers

[Fulthrotl]

This is one of those left over hardware during my active days (I'm retired) providing services for the aerospace industries.
Machine shops around the LA area were heavily involved in providing parts and support for the space shuttle program at the time.

i was working in machine shops during that time, making parts for
the shuttle. back then, they had paper tape readers, and some people
were going for the cutting edge..... a digital machine control system. whoot!

it is astounding what has transpired since then.

 

[Ingenieur]

plc simulator program
http://www.thelearningpit.com/plc/psim/psim.html
search around, there are others