Dear All,

Hw config. are 317-dp cpu with FM350-2 counter modle.

Connect HTL encoder A  to FM module nr 5 and B to Number 8. (mean channel 1)

when turn encoder forward without any problem and counted.

if encoder turned backward fm module not count.

I need your advice

many thank for all helps

Hello necyil,

Here is a link to manual:

SIMATIC S7-300 FM 350-2 Counter Module

Please give some information about parameters, you have changed.

Have a look at page 38 for wiring.

Best regards,

Wizard