Voltage encoder with 7i97T board

I currently have a 7i97t board, and I would like to connect a pin encoder to my board.

my encoder must be powered in 10-30V dc (i don't know the encoder output voltage), it's single-ended wiring.

i've seen that the 7i97t board can handle input voltages of 12V single-ended.

is it too risky to cable my encoder on my board with 10V voltages or should I cable it with a voltage divider?

My encoder is currently connected like this:

VCC - A - B - /Z - Ground

should I keep it as is (no importance) or should I change the wiring of the /z to z index?

I would check the output voltage, they might be 5V out or open collector.
The may also be open collector with a pullup resistor to their power supply
(you can test for a resistive pullup by supplying a small load on the output,
say 1K Ohm. and seeing if the voltage output drops significant;y when loaded

How to handle the interface depends on what kind of outputs the encoder has.

 

My coder's technical documentation is as follows 

 

 

That's a bit awkward since the low level is only specified to be less than 2V
which is very close to the TTL input threshold.

It would require a voltage divider per pin, say 220 ohms from 7I97T input
to ground and 1K Ohm in series per pin for 24V encoder power

When the jumpers are in the left hand position, /A /B /Z is a ground or should i wiring all 220 ohm resistor in ground (24V) ?

The 220 ohm resistors would be connected between the A,B,IDX inputs
and encoder ground (TB1,TB2 pins 3,11,19)


So for example for encoder 0 signal A:

Encoder signal  A --> 1K resistor --> 7I97T TB1.1 (A)
7I97 TB1.1 (A) --> 220 ohm resistor --> 7I97T TB1.3 (GND)

and the last question, should i connect the ground of the 24VDC on the encoder ground ?

Yes, the 24V common/negative needs to connect to the 7I97 encoder GND.