On 10/17/25 02:29, Viesturs Lācis wrote:
Hello!
I would like to ask if anyone has some experience (and hopefully some
suggestions) to share about cheap PLC+HMI combination.
What I am looking for is capability to count encoder pulses, read
thermistor signal, 2-3 more digital inputs and 2-3 digital outputs.
And showing some values as well as few buttons on screen.
I looked at aliexpress and found this one - description matches what I
have in mind:
https://www.aliexpress.com/item/1005009551998203.html
404 from here in the US.
And then there are some even more attractive pricewise:
https://www.aliexpress.com/item/1005008850308591.html
https://www.aliexpress.com/item/1005005744854905.html
But for these latter examples description is lacking details and what
I see about the programming cable - seems like having serial port on
PC is a requirement which is show-stopper for me.
So I have a lot doubt about these devices NOT being PITA to program and set up.
Any stories of experience with similar items and suggestions what to
choose are kindly welcome!
Thanks in advance!
Viesturs
I didn't yet check the other links. But if looking for speed, I have a
1000 ppr $22 omron balanced output encoder on the rear of the go704
motor which turns about 21k rpms feeding thru a bypassed bob to a 5i25
AB encoder to read spindle speed & feedback to the spindle PID with some
math. WOT that spindle can hit 3k revs where high gear is slightly over
7/1. That's about 21k rpms at the motor, so the encoder is seeing 1000
pulses per motor rev. My tach is dead on when the motor is doing the 21k
revs. It amazes me that its working, but has been for about a decade.
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Cheers, Gene Heskett, CET.
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