Re: LOTS of US Water Plants Hit by Hacks

On 05/08/2026 23:38, rbowman wrote:
> On 5 Aug 2026 20:19:24 GMT, Robert Riches wrote:
> 
>> Sounds like the apparent disagreement might be a matter of which kind of
>> "stepper" each party is talking about:
>>
>>    - stepping relays/switches -- used in very old mechanical
>>      telephone switching equipment
> 
> A picture is worth 1000 words so I clarified. The 'steppers' I had in mind
> didn't have much in common with the telco equipment. Among other things
> they rotated 360 degrees.

Yeah. Uniselectors I think we called them...360 degrees was rare though...
essentially multiway relays.

Big, expensive  - especially to replace if one contact was dodgy.

Became easier to use a bit of electronics to drive a bank of single way 
relays instead.

That whole area of control logic was one of the first areas to get 
'digitised' IIRC. It wasn't my field though.



-- 
"And if the blind lead the blind, both shall fall into the ditch".

Gospel of St. Mathew 15:14