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General => Technical support => Topic started by: artkraft on June 27, 2015, 08:30:04 PM

Title: H11l2
Post by: artkraft on June 27, 2015, 08:30:04 PM

Wired H11L2 as per diagram in manual (24v to 5v). When I test it by grounding pin #2 to simulate sink from PLC I only read .1 vdc (multimeter) to the stepper driver. shouldn't I read 5v Pin #4 to grnd.

Title: Re:H11l2
Post by: support on June 30, 2015, 07:31:18 PM

If you check the datasheet of H11L2:

https://www.fairchildsemi.com/datasheets/H1/H11L1M.pdf

It is mentioned that the logic output is open-collector and is an inverter design. I.e. when the input LED is turned ON the output is pulled to low. If the input LED is OFF the output needs a pull up resistor to pull up to +5V.