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I building Mariss's circuit that's in the file section and plan on
wiring a reset switch to the opto and need to know if I should add a
current limiting resistor.

Frank

--- In CAD_CAM_EDM_DRO@y..., "dakota8833" <dakota8833@b...> wrote:

I building Mariss's circuit that's in the file section and plan on
wiring a reset switch to the opto and need to know if I should add

a

current limiting resistor.

Frank,
I try to avoid circuits that need things like resistors :). Are you
aware that on all of the new Gecko's you can connect all of the fault
circuits together? If one faults they all do. When you reset one they
all reset. Works great on my mill.

Roger

the new Gecko's you can connect all of the
fault

circuits together? If one faults they all do. When you reset one

they

all reset. Works great on my mill.

Roger

Well that's great for the new Geckos but I don't want to spend
hundreds replacing my older ones when a few dollars will do the trick

Frank

List,

I have several servomotors with Baumer encoders. The output level of the
encoder is 12-30 V (depends on what they get).
What is the best way to make the output TTL compatible?

regards,

Frank

Frank de Beer wrote:

List,

I have several servomotors with Baumer encoders. The output level of the
encoder is 12-30 V (depends on what they get).
What is the best way to make the output TTL compatible?

If these are "open collector", then you just pull the lines to +5 V with
a resistor, and they won't go above 5 V. That is a common arrangement.
You may still have to supply 12 V to the encoders.

If they do, in fact, pull up to whatever the DC supply voltage is, you
will need level converters. Opto-couplers can be used to do that, so
you'd provide a series resistor and then let the encoder signal flow
through the LED in the coupler.

You could also use a CMOS buffer chip, such as a 74HC14, and a
voltage divider network such that the voltages came out in the 0..+5V
range. A 1 K resistor to ground at the input to the chip, and a 1.5 K
resistor from the input to the encoder signal would make the conversion,
and the output of the chip would feed to whatever was reading the encoder.

Jon