text: <s>[INST] PF525 with HTL encoder Hi everbody, I want to share my story about this:PF525 with HTL encoder.We created an easy position control application with gearbox,chain and asynchronous motor with HTL type of encoder. The encoder power supply was 24VDC and the output of the A and B channel also.We wired the encoder output channel to the PF525 encoder card.The power supply comes from the cabinet control power supply.The connection of the encoder is single ended because the type of the encoder is HTL. After we wired the all components in the application,we want to test the equipment.Didnt work properly,after every move we were in bad position,compared to where it should be.We checked everything,mechanical and electrical things.We cretaed trend about Encoder speed(378) and Units Traveled H(388).We checked what happen,why were we in bad position.We have seen on the trend,we dont go with same speed and traveled units with forward and backward,even if we dont set position control,speed feedback,(simple settings)only check what happen.First of all we checked the power supply,that the supply has correctly (24VDC and common also), but it was perfect.After we checked channel A and B with oscilloscope.The signs of the encoder were perfect,without level problem.It wasnt missing signal. Fortunately the encoder can work with 9-30VDC,therefore we wired the encoder power supply to the encoder card power supply and we had set 12VDC.Because of this level also changed to 12VDC.And what a surprise the system works fine. In summary the encoder card count badly the encoder signal with 24VDC encoder power supply.This problem exists only when the drive has controlled.If we didnt control the drive the count was good.But unfortunately is not realizable:) I think the card is very sensitive of the DC level,therefore the card dropped the signal if the level is higher than maybe 26VDC.(The RA wrote this value to the card,and also wrote down,the card can handle HTL encoder) Please check your product limit before sell it!!! Regards and sorry my english knowledge [/INST] Hi Tom, I try to use the position control mode with Pf525 and TTL encoder connected to enocoder card. But the problem is that my drive wouldn't start. The drive has been set for position mode with step logic. I want to move the converyor belt to defined position but nothing is happening after start. The drive is in the run with 0Hz. When I run the drive with velocity mode, I can read the Encoder Speed but the Units Traveled is always very high and doesn't change while drive is running. Do you have any manual or sample code, which halps me discove how to use the position mode with pf525 with CompactLogix? I will be grateful for any advice. Cheers, Przemek \\n </s>