I am looking to interface with a Siemens controller 135U. I expect there is somewhere to purchase used equipment but haven't found any yet.
I downloaded the software from Siemens and wanting to purchase 'legal' key and cable. I expect I shouldn't have to spend $800 today for this.
I did find...
Needing analog voltage help. Just can’t seem to get a grip of what to do with what I have.
My background:
Self taught – no real schooling.
No analog background. Ten years using many plc’s but almost all in discrete functions in ladder logic. Plc’s from A-B, Siemans, Modicon, Symax, Keyence...