Start/Stop type encoders
- Thread starter Pavan
- Start date
ArikBY
Member
Liniar encoder work like rotary encoder.
That mean for all the length you will get certain amount of pulses.
You need high speed counter to trace your encoder.(in most cases)
Go to your PLC manual and see how to set the high speed counter.
make sure your input type(PNP\NPN) is a same like the encoder output.
Let me know what kind of PLC you are working with.
I will try to help.
That mean for all the length you will get certain amount of pulses.
You need high speed counter to trace your encoder.(in most cases)
Go to your PLC manual and see how to set the high speed counter.
make sure your input type(PNP\NPN) is a same like the encoder output.
Let me know what kind of PLC you are working with.
I will try to help.
kamenges
Member
The basic idea is the device will put out a pulse time that is proportional to the distance.
You initiate the transfer with an initiate signal. The device will send out two pulses with some time between them. There is a slightly different interface where you send the initiate and the device only sends back one pulse. You then time between the initiate signal and the return pulse.
It is up to you to measure that time. The specs for your encoder should tell you how distance and time map to each other.
To read this you will need a relatively fast device. Most likely a specialty module that will measure the time between two pulses. I don't think there is anything you can do inside a standard plc that will be able to catch a signal as fast as this is.
Keith
You initiate the transfer with an initiate signal. The device will send out two pulses with some time between them. There is a slightly different interface where you send the initiate and the device only sends back one pulse. You then time between the initiate signal and the return pulse.
It is up to you to measure that time. The specs for your encoder should tell you how distance and time map to each other.
To read this you will need a relatively fast device. Most likely a specialty module that will measure the time between two pulses. I don't think there is anything you can do inside a standard plc that will be able to catch a signal as fast as this is.
Keith
it's not like rotary encoders
Hi
Start/Stop linear encoders which is known as "magnetostrictive Displacement Transducers" measure the position as a function of time depending on transmitting a siganl with the light velocity 3x10+e8 m/sec and then receive the reflected signal from a cursor (magnet)
knowing the speed and the time then the cursor position can be calculated.
There are many formats for this sensors outputs .it could be analog voltage /current ,it could be digital(start/stop ,PWM).
In START/STOP FORMAT
When begin the inquire function on the output is generated an impulse named START; the STOP impulse is generated when the pick-up receive the sound-wave from the cursor position.
BR
Hi
No Start/Stop Linear encoders is not working in the same manner like rotary encoders.
Start/Stop linear encoders which is known as "magnetostrictive Displacement Transducers" measure the position as a function of time depending on transmitting a siganl with the light velocity 3x10+e8 m/sec and then receive the reflected signal from a cursor (magnet)
knowing the speed and the time then the cursor position can be calculated.
There are many formats for this sensors outputs .it could be analog voltage /current ,it could be digital(start/stop ,PWM).
In START/STOP FORMAT
When begin the inquire function on the output is generated an impulse named START; the STOP impulse is generated when the pick-up receive the sound-wave from the cursor position.
BR
ArikBY
Member
hesham
Could you please send me some info of what you talking about. I think
You mix it with something else,
Or maybe I made a mitake.
Could you please send me some info of what you talking about. I think
You mix it with something else,
Or maybe I made a mitake.
panic mode
Member
I think he is talking about this:
Temposonic
If you want something with quadrature output like from rotary encoder, check MLFK series from
http://www.baumerelectric.com/
They are inexpencive and compact. They count pulses by sensing motion of sensor compared to magnetic strip (which can be pretty much any length).
Temposonic
If you want something with quadrature output like from rotary encoder, check MLFK series from
http://www.baumerelectric.com/
They are inexpencive and compact. They count pulses by sensing motion of sensor compared to magnetic strip (which can be pretty much any length).
Last edited:
ArikBY
Member
Pavan
Could you please write the type and manufacture of your encoder.
hesham
Could you please direct me to what you takeing about I looked the link you wrote, what I saw is not encoders.
Could you please write the type and manufacture of your encoder.
hesham
Could you please direct me to what you takeing about I looked the link you wrote, what I saw is not encoders.
rsdoran
Lifetime Supporting Member
Arik, let me see if I can clarify some issues. The term used encoder is inappropriate. The device is basically a sensor that offers signals to show when at home or end of travel possibly with analog that offers a position reference.
Need to know the device Pavan to offer suggestions on how to connect it.
Need to know the device Pavan to offer suggestions on how to connect it.
ArikBY
Member
Ron
That what I think.
I know liniar encoder (like rotary encoders).
It seems they talking about something else.
I think he talking about analog ruler.LIke what useing in milling machine.
That what I think.
I know liniar encoder (like rotary encoders).
It seems they talking about something else.
I think he talking about analog ruler.LIke what useing in milling machine.
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