Parker SSD Glass Fibre-optic Encoder Feedback Card for 590P Series DC Drives.
When factory fitted to a DC 590P or 591P, the part number is changed as follows:-
Current Part Number: 59XP-XXXXXXXX-XXX-XXGX
Legacy Part Number: 59XP / XXXX / XXX / XXXX / XX / ENG / X / X / X
Manufacturer Part Number is: LA387997U011. Sometimes referred to by PCB marking AH386025U001.